Transmission Fundamentals 2

8/9/2019 Transmission Fundamentals 2

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Transmission Fundamentals

1. What is the opposition to the transfer of energy which is considered the dominant characteristic of acable or circuit that emanates from its physical structure?

a. Conductance

b. Resistance

c. Reactance

d. Impedance

2. When load impedance equals to Zoof the line it means that the load !!!!! all the power.

a. reflects

b. absorbs

c. attenuates

d. radiates

". impedance matching ratio of a coa# balun.

a. 1$%

b. %$1

c. 2$1

d. "$2

%. Which stands for d& relati'e le'el?

a. d&rn

b. d&a

c. d&r

d. d

(. )tandard test tone used for audio measurement.

a. *++ ,-


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b. "++ ,-

c. 1++ ,-

d. 1+++ ,-

. When /)WR is equal to -ero this means

a. that no power is applied

b. that the load is purely resisti'e

c. that the load is a pure reactance

d. that the load is opened

0. !!!!!!! is the ratio of reflected 'oltage to the forward tra'elling 'oltage.

a. )WR

b. /)WR

c. Reflection coefficient

d. I)WR

*. ransmission line must be matched to the load to !!!!!!.

a. transfer ma#imum 'oltage to the load

b. transfer ma#imum power to the load

c. reduce the load current

d. transfer ma#imum current to the load

. Which indicate the relati'e energy loss in a capacitor?

a. 3uality factor

b. Reacti'e factor

c. 4issipation factor

d. 5ower factor

1+. What is the standard test tone?


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a. + d&

b. + d&W

c. + d&m

d. + d&rn

11. he energy that neither radiated into space nor completely transmitted.

a. Reflected wa'es

b. Captured wa'es

c. Incident wa'es

d. )tanding wa'es

12. 6icron is equal to !!!!!!! meter.

a. 1+71+

b. 1+7

c. 1+7

d. 1+7"

1". 1 8ngstrom 98: is equal to !!!!!!!.

a. 1+7"micron

b. 1+71+m

c. 1+7micron

d. 1+7m

1%. Why is it impossible to use a wa'eguide at low radio frequencies?

a. &ecause of the si-e of the wa'eguide

b. 4ue to se'ere attenuation

c. 4ue to too much radiation

d. 8ll of these


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1(. !!!!!!!! is the transmission and reception of information.

a. 6odulation

b. Communications

c. Radiation

d. ;mission

1. What is the loss of the circuit in d& if the power ration of output to input is +.+1?

a. 2+

b. 72+

c. %+

d. 7%+

10. ransmission lines are either balanced or unbalanced with respect to

a. ow attenuation

b. ;asy installation

c. >ow radiation loss


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d. ensile strength

2+. !!!!!!! is the method of determining the bandwidth of any processing system.

a. ourier series

b. )pectral analysis

c. requency analysis

d. &andwidth analysis

21. What causes the attenuation present in a wa'eguide?

a. he air dielectric filling the guide

b. he coating of sil'er inside

c. >osses in the conducting walls of the guide

d. Radiation loss

22. 8 de'ice that con'erts a balanced line to an unbalanced line of a transmission line.

a. ,ybrid

b. )tub

c. 4irectional coupler

d. &alun

2". What is the appro#imate line impedance of a parallel7strip line spaced 1 cm apart with the length of (+cm?

a. 1+ ohms

b. 1( ohms

c. 1* ohms

d. 2" ohms

2%. What is the a'erage power rating of R=7(* C@u?

a. 2( W

b. (+ W


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c. 0( W

d. 2++ W

2(. 8 coa#ial cable used for high temperatures.

a. R=7(*C

b. R=7118

c. R=721"

d. R=7211

2. If you ha'e a'ailable number of power amplifiers with a gain of 1++ each how many such amplifiersdo you need to cascade to gi'e an o'erall gain of +d&?

a. 2

b. "

c. %

d. (

20. Aou are measuring noise in a 'oice channel at a 7% d& test point le'el the meter reads 70" d&mcon'ert the reading into d&rnCB.

a. 12

b. 1

c. 1*

d. 21

2*. he 'elocity factor for a transmission line

a. depends on the dielectric constant of the material used

b. increases the 'elocity along the transmission line

c. is go'erned by the sin effect

d. is higher for a solid dielectric than for air

2. Impedance in'ersion can be obtained by


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a. a short7circuited stub

b. an open7circuited stub

c. a quarter7wa'e line

d. a half7wa'e line

"+. ransmission lines when connected to antennas ha'e

a. capaciti'e load

b. resisti'e load whose resistance is greater than the characteristic impedance of the line

c. resisti'e load whose resistance is less than the characteristic impedance of the line

d. resisti'e load at the resonant frequency

"1. Bne of the following is not a bounded media.

a. Coa#ial line

b. wo7wire line

c. Wa'eguide

d. Bcean

"2. he impedance measured at the input of the transmission line when its length is infinite.

a. Input impedance

b. Bpen circuit impedance

c. Characteristic impedance

d. )hort circuit impedance

"". he following are considered primary line constants e#cept

a. conductance

b. resistance

c. capacitance

d. comple# propagation constant


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"%. he dielectric constants of materials commonly used in transmission lines range from about

a. 1.2 to 2.*

b. 2.* to ".(

c. ".( to (.2

d. 1.+ to 1.2

"(. ypically the 'elocity factor 9/: of the materials used in transmission lines range from

a. +. to +.

b. +.1 to +.(

c. 1.+ to +.

d. +. to +.*

". or an air dielectric two7wire line the minimum characteristic impedance 'alue is

a. *( ohms

b. *( ohms

c. + ohms

d. ** ohms

"0. When a quarter7wa'e section transmission line is terminated by a short circuit and is connected to anR source at the other end its input impedance is

a. inducti'e

b. capaciti'e

c. resisti'e

d. equi'alent to a parallel resonant >C circuit

"*. 8 transmitter operating at "+ 6,- with % W output is connected 'ia 1+ m of R=7*8@u cable to anantenna that has an input resistance of "++ ohms. ind the reflection coefficient.

a. +.01

b. +.00


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c. +.0

d. +.0

". 8 quarter wa'e transformer is connected to a parallel wire line in order to match the line to a load of1+++ ohms. he transformer has a characteristic impedance of "1.2" ohms. he distance between

centers is % inches. What is the percentage reduction in the diameter of the line?

a. *(D

b. *"D

c. *D

d. +D

%+. he concept used to mae one )mith chart uni'ersal is called

a. ioni-ation

b. normali-ation

c. rationali-ation

d. termination

%1. What are the basic elements of communications system?

a. )ource transmission channel transmitter

b. ransmitter recei'er transmission channel

c. Information transmission channel recei'er

d. )ender and recei'er

42. ________ is the transmission of printed material over telephone lines.

a. Internet

b. 4ata communication

c. elegraphy

d. Facsimile

43. ________ is a continuous tone generated by the combination of two frequencies of 35 !" and44 !" used in telephone sets.


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a. 4C tone

b. Ringing tone

c. 4ial tone

d. #all waiting tone

44. ________ are unidirectional amplifiers having 2$25 decibel gain that are placed about %5 &mapart used to compensate for losses along the telephone line.

a. 'F repeaters

b. >oading coils

c. >oop e#tenders

d. ;cho suppressors

45. ________ is a component in the telephone set that has the primary function of interfacing thehandset to the local loop.

a. Resistor

b. Capacitor

c. /aristor

d. (nduction coil

4). *ulse dialing has ________ rate.

a. 2 pulses+min

b. , pulses+min

c. , pulses+sec

d. - pulses+sec

4%. ________ is a telephone wire that connects two central offices.

a. 27wire circuit

b. Trun& line

c. >eased line


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d. 5ri'ate line

4-. The central switching office coordinating element for all cell sites that has cellular processorand a cellular switch. (t interfaces with telephone company "one offices control call processingand handle billing activities.

a. /T01

b. Cell site

c. 5)ost calls of (D

d. >ost calls of 1+(D

52. ________ is the 1ut$of$and signaling between Toll #entral 1ffices 9ell 0ystem 0tandard:.

a. " *2( ,-

b. 3 % !"

c. 2 ++ ,-


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d. *++ ,-

53. (n a telephone system the customer;s telephone directory numbering is from to whatis the capacity of a telephone system numbering from to 6

a. 1++ lines

b. , lines

c. 1+ +++ lines

d. 1++ +++ lines

(%. If the )WR is infinite what type of load transmission line has?

a. 5urely reacti'e

b. 5urely resisti'e

c. 5urely capaciti'e

d. 5urely inducti'e

55. #. >. ,),.

a. *

b. 1+

c. 11

d. ,2

5). 1ne 9,: >rlang is equal to _______.

a. "+ CC)

b. 3) ##0

c. ". CC)

d. 1++ CC)

5%. 0tandard tariff for flat rate telephone service beyond the normal flat rate in that area.

a. ?T0


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b. B>5

c. I5

d. 4WE

5-. The standard analog telephone channel bandwidth.

a. 3$34 !"

b. 12++ ,-

c. 2++7"2++ ,-

d. "++7"+++ ,-

5. Type of switching in which a pair of wire from the telephone set terminates in a @ac& and the

switch is supervised by an operator.

a. Crossbar switching

b. /anual switching

c. ;lectronic switching

d. )tep7by7step switching

). >very time when the telephone is idle the handset is in the _______ state.

a. 1n$hoo&

b. Bff7hoo

c. &usy

d. )pare

),. _______ is a component in the telephone set that has the primary function of compensating forthe local loop length.

a. Resistor

b. 'aristor

c. Capacitor

d. Induction coil


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)2. ?hat &ind of receiver is used in conventional telephone handset6

a. Carbon

b. >lectromagnetic

c. Ceramic

d. Capacitor

". 8 'oice7grade circuit using the 5< ha an ideal passband of

a. + to % ,-

b. + to % 6,-

c. + to % ,-

d. + to % =,-

)4. ________ is the minimum$quality circuit available using the *T


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d. ssure the customer that the telephone is wor&ing

)%. ________ is a special service circuit connecting two private branch eCchanges 9*D:.

a. 5hantom line

b. Tie trun&

c. andem trun

d. 5ri'ate line

)-. The published rates regulation and descriptions governing the provision of communicationsservice for public use.

a. oll rate

b. Tariff

c. &ul billing

d. 4etailed billing

). ?hat is the power loss of a telephone hybrid6

a. 1 d&

b. 2 d&

c. " d&

d. d&

%. Telephone channel has a band$pass characteristic occupying the frequency range of!!!!!!!.

a. "++7%++ ,-

b. 3$34 !"

c. "++7"+++ ,-

d. "++720++ ,-

%,. The first 0trowger step$by$step switch was used in _______.

a. 1*0(

b. 1*+


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c. ,-%

d. 11"

%2. ?hat is the phase delay of an - !" voice signal if the phase shift is ,5 degrees6

a. 52 Esec

b. 1.2( Fsec

c. *"."" Fsec

d. 2 Fsec

%3. ?hat is the ##(TT recommendation for a preparation of loss plan a variable loss plans and afiCed loss plan6

a. =. 1""

b. =. 1%1

c. =. 1"2

d. A. ,22

%4. ?hat is the diameter of a copper wire to be used in a ,) &m loop with a dc loop resistance of, ohms+&m6

a. +.*"* mm

b. .4)5 mm

c. 1.2 mm

d. 2.1( mm

05. ?hat &ind of cell is appropriate for load management fast moving mobiles and low$usageareas6

a. 5ico cells

b. 6icro cells

c.


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a. adaptive array

b. flat plate antenna

c. dipole array

d. focused antenna

%%. ?hat is the basis of the first generation wireless local loop6

a. 4igital cellular technology

b. nalogue cellular technology

c. 5)oading means the addition of

a. resistor

b. capacitor

c. bullet

d. inductance

12. What is the most commonly used transmission line for high frequency application?

a. wo7wire balance line

b. )ingle wire

c. hree7wire line

d. Coa#ial

120. he characteristic impedance of a transmission line does not depend upon its

a. length

b. conductor diameter

c. conductor spacing

d. dielectric material

12*. Bne of the following is not a common transmission line impedance.

a. (+ ohms


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b. 0( ohms

c. 12+ ohms

d. "++ ohms

12. or ma#imum absorption of power at the antenna the relationship between the characteristicimpedance of the line Zoand the load impedance Z>should be

a. ZoL Z>

b. ZoM Z>

c. ZoN Z>

d. ZoL +

1"+. he mismatch between antenna and transmission line impedance cannot be corrected for by

a. using >C matcging networ

b. adOusting antenna length

c. using a balun

d. adOusting the length of transmission line

1"1. !!!!!!!! is a pattern of 'oltage and current 'ariations along a transmission line not terminated in itscharacteristic impedance.

a. 8n electric field

b. Radio wa'es

c. )tanding wa'es

d. 8 magnetic field

1"2. Which is the desirable )WR on a transmission line?

a. +

b. 1

c. 2

d. Infinity


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1"". 8 (+ohm coa# is connected to a 0"7ohm antenna. What is the )WR?

a. +.*(

b. 1

c. 1.%

d. 2.2

1"%. What is the most desirable reflection coefficient?

a. +

b. +.(

c. 1

d. Infinity

1"(. What is the ratio e#pressing the percentage of incident 'oltage reflected on a transmission line?

a. /elocity factor

b. )tanding7wa'e ratio


d. >ine efficiency

1". he minimum 'oltage along a transmission line is 2+ / while the ma#imum is "+ / the )WR is

a. +.0

b. 1.+

c. 1.2

d. 1.(

1"0. Bne meter is one wa'elength at a frequency of

a. 1(+ 6,-

b. 1% 6,-

c. "++ 6,-


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d. "2* 6,-

1"*. 8t 'ery high frequencies transmission lines act as

a. uned circuits

b. 8ntennas

c. Insulators

d. Resistors

1". 8 shorted quarter7wa'e line at the operating frequency acts lie a@an

a. Capacitor

b. Inductor

c. )eries resonant circuit

d. 5arallel resonant circuit

1%+. 8 shorted half7wa'e line at the operating frequency acts lie a@an

a. Capacitor

b. Inductor

c. )eries resonant circuit

d. 5arallel resonant circuit

1%1. 8 medium least susceptible to noise?

a. )hielded pair

b. wisted pair

c. iber7optic

d. Coa#ial

1%2. 8 medium most widely used in >8


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c. iber7optic cable

d. Coa#ial

1%". he most commonly used transmission line in tele'ision system.

a. 5arallel7wire line

b. Coa#ial cable

c. Wa'eguide

d. Bpen7wire ceramic supports

1%%. he impedance of a / transmission line depends on se'eral factors. Which is not one of thosefactors?

a. 4iameter

b. >ength of the wire

c. 4ielectric material

d. )eparation between conductors

1%(. 4C blocs are used in coa#ial transmission line for the purpose of

a. passing 4C while blocing 8C

b. passing 8C 'oltage but pre'ent 4C

c. pre'enting 8C 'oltage from reaching the pre7amplifier

d. pre'enting 8C power supply 'oltage from being shorted by a balun or band splitter

1%. !!!!!!! is a type of interference caused by off7air / channels 2 and % plus a satellite dishoperating on channel ".

a. 8dOacent channel interference

b. =host

c. Co7channel interference

d. Crosstal

1%0. 4ithering 9in /RB communication: is a process of


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a. Reducing the effect of noise on the /RB 'ideo signal

b. Centering the 'ideo fine tuning on /RB channels

c. 6o'ing the feedhorn rotor to the precise angle

d. 6o'ing the actuator e#actly onto the desired satellite beam

1%*. 8 networ that has an input of 0(d& and an output of "(d&. he loss of the networ is

a. 7%+db

b. %+db

c. %+d&m

d. 7%d&m

1%. Important useful quantities describing wa'eforms.

a. ime and frequency

b. /oltage and current

c. requency and 'oltage

d. 5ower and frequency

1(+. ,al'ing the power means

a. 7d& gain

b. "7d& loss

c. "7d& gain

d. 7d& loss

!0!. t&e dierence bet$een t&ereuency at $&ic& t&e cuto

$avelen't& i* t$ice t&e narro$di%en*ion!0(. at a di*tance o one uarter $avelen't& ro% t&e *ealed end!03. + &i'& value o re*i*tance!04. an i%-edance %i*%atc& bet$eent&e line and t&e load

!05. t&e line be&ave* a* a -arallel#tuned circuit in relation to t&e

'enerator!06. any convenient value!07. at t&e be'innin' and at t&e endo t&e cable!08. it* in-ut i%-edance at t&e'enerator i* eual to t&e line* *ur'ei%-edance


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!09. tran*er %ai%u% -o$er to t&eload!!0. 3!!!. )!!(. 3C and +3:113. AW :1!

!!4. avelen't&!!5. *uare root o t&e dielectriccon*tant!!6. ave'uide!!7. balun!!8. 0.5 k%!!9. %ode!(0. 3 ,Hz!(!. ave'uide*!((. entro-y!(3. reduced electro%a'neticintererence

!(4. all o t&e above!(5. inductance!(6. Coaial!(7. len't&!(8. !(0 o&%*!(9. ;o< ;=

!30. ad>u*tin' t&e len't& otran*%i**ion line!3!. )tandin' $ave*!3(. !!33. !.46!34. 0

!35. eection coefcient!36. !.5!37. 300 ?Hz!38. +ntenna*!39. Parallel re*onant circuit!40. )erie* re*onant circuit!4!. Coaial!4(. $i*ted -air!43. Coaial cable!44. =en't& o t&e $ire!45. -reventin' +C -o$er *u--lyvolta'e ro% bein' *&orted by a balun

or band *-litter!46. +d>acent c&annel intererence!47. educin' t&e eect o noi*e ont&e 2@ video *i'nal!48. 40db!49. reuency and volta'e!50. 3#d/ lo**

1(1. Bne


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1(2. 8 signal is amplified 1++ times in power. he d& gain is

a. 2+ d&

b. 11 d&

c. 1( d&

d. 2( d&

1(". Which of the following is used to measure )WR?

a. )pectrum analy-er

b. Reflectometer

c. Bscilloscope

d. 6ultimeter

1(%. 21%7+( twin lead which is commonly used for / lead7in has a characteristic impedance of

a. (2 ohms

b. 0( ohms

c. ++ ohms

d. "++ ohms

1((. What is the characteristic impedance of a transmission line which is to act a s a quarterwa'ematching transformer between a 10( ohms transmission line and ++ ohms load?

a. "++.+% ohms

b. "2%.+% ohms

c. "1+.+% ohms

d. "2+.+% ohms

1(. What is the ;IR5 in d&W of a (+d& antenna connected to a transmitter with an output of 1+Wthrough a transmission line with loss of (d&?

a. *( d&W

b. (( d&W


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c. + d&W

d. *+ d&W

1(0. 8 coa#ial cable is a good e#ample of a@an

a. Hnbounded medium

b. ransmission channel

c.


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11. 4etermine also the total attenuation of the line in the preceding problem.

a. 2.+d&

b. 1.( d&

c. 2.( d&

d. 1.+ d&

12. What is the ma#imum subscriber loop length in ft of a telephone system if the signaling resistanceis 1*++ohms using a telephone cable pair of gauge K2 with loop resistance of *".( ohms per 1++ft.

8ssume the telephone set resistance is equal to 2++ ohms.

a. 1(11.0 feet

b. ,,), feet

c. 1("++ feet

d. 2++++ feet

1". If the same subscriber loop abo'e limits the 'oice attenuation to a ma#imum of d& what is thema#imum allowable subscriber loop length in feet using the same gauge K2 telephone wire? 8ssume a2.0d& loss per mile.

a. 2++++ ft

b. 1"++ ft

c. 1(2*+ ft

d. ,,%33 ft

,)4. The input is .,? and the networ& gain is ,3d the output is

a. 2. ?

b. 2.( W

c. 1.( W

d. 1.* W

,)5. Jnown as one$tenth of a neper.

a. d&

b. d&m


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c. d&p

d. d


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d. osses are hea'y at lower frequencies

c. hey depend on straight line propagation

d.


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c. 1$%

d. 2$1

1*+. wo wires of ++ ohms characteristic impedance is to be constructed out of a number 12 wire 9*1mils:. ind the attenuation of the line at +.=,- per 1++feet length

a. +.+( d&

b. +.(( d&

c. +.%% d&

d. +."( d&

1*1. In the preceding problem determine the spacing between wires from center to center.

a. in

b. % in

c. ( in

d. " in

1*2. 8 lossless transmission line has a shunt capacitance of 1++n@m and a series inductance of %m,@m.What is the characteristic impedance?

a. (++ ohms

b. %++ohms

c. "++ ohms

d. 2++ ohms

1*". 8 ten times power change in transmission system is equi'alent to

a. 1+ d&m

b. 1 d&

c. 2+ d&

d. 1++ d&

1*%. 8 type of transmission line employed where balanced properties are required.


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a. &alun

b. 5arallel7wire line

c. Coa#ial line

d. 3uarterwa'e line

1*(. What is the characteristic impedance of a transmission line which has a capacitance of %+n@ft andan inductance of +.(m,@ft

a. 111.* ohms

b. 11+.* ohms

c. 112.* ohms

d. 1+.* ohms

1*. he input power to a loss7free cable is (W. If the reflected power is 0d& down on the incident powerthe output power to the load is

a. % W

b. ( W

c. W

d. 0 W

1*0. o be properly matched the ratio of a ma#imum 'oltage along a transmission line should be equal to

a. 1

b. 1+

c. (+

d. 2

1**. 8 coa#ial line with an outer diameter of mm has a (+ ohms characteristic impedance. If thedielectric constant of the insulation is 1.+. calculate the inner diameter.

a. 2.+ cm

b. 2.+ in

c. 2.+ mm


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d. 2.+ mm

1*. If an amplifier has equal input and out impedance what 'oltage ratio does the gain of (+d&represent?

a. "1.2

b. "2(.2

c. "2+.1

d. "1(.+

1+. What is the inductance per foot of a cable that has a capacitance of (+ p@ft and a characteristicimpedance of + ohms?

a. +.10u,@ft

b. +.10* u,@ft

c. +.1 u,@ft

d. +.1* u,@ft

11. he ratio between the energy absorbed by a surface to the total energy recei'ed by the surface.

a. Reflection coefficient

b. 8bsorption coefficient

c. >inear coefficient

d. hermal coefficient

12. When the diameter of the conductors of a wire transmission line is held constant the effect ofdecreasing the distance between the conductors is

a. Increase the surge impedance

b. Increase the radiation resistance

c. 4ecrease the )WR

d. 4ecrease the impedance

1". he higher the gauge number if a conductor

a. he bigger the diameter


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b. he higher the resistance or the smaller the diameter

c. he higher the resistance

d.


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1*. 8 two7transmission line consists of !.97 o&%*!7!. #!.98!7(. =en't&!73. + lo** o one &al o t&e -o$er!74. =o$ attenuation!75. o 'enerator* are -o$erulenou'& to ecite t&e%176. 2 W177.


47/124

!80. 0.44 d/!8!. 6 in!8(. (00 o&%*!83. ! d/!84. Parallel#$ire line!85. !!!.8 o&%*

!86. 4 !87. !!88. (.09 %%!89. 3!6.(!90. 0.!8 uHEt

!9!. +b*or-tion coefcient!9(. Fecrea*e t&e i%-edance!93. &e &i'&er t&e re*i*tance or t&e*%aller t&e dia%eter!94. GE4 tran*or%er!95. eectance

!96. !76 o&%*!97. 0.476 u!98. 660 o&%*!99. 0.03(00. AnBnite

2+1. If the 1+D of the microwa'e power is reflected at the mismatch find the return loss.

a. +.1 d&

b. 1+ d&m

c. 71+ d&

d. 71+ d&m

2+2. If the return loss is 2+ d& find the present reflected power.

a. 1D

b. 1+D

c. (D

d. 2+D

2+". Con'ert Sten times biggerT to the equi'alent numerical d&

a. 2+ d&

b. 1( d&

c. ( d&

d. 1+ d&

2+%. Con'ert Sone7half as largeT to equi'alent numerical d&


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a. " d&

b. 7" d&

c. 2 d&

d. 72 d&

2+(. )pecial semiconductor diode use for electronically adOustable attenuation

a. Ideal diode

b. 5I< diode

c. Zener diode

d. unel diode

2+. 8 (+ ohm line is probed and found to ha'e a )WR of 2. what are the two possible quarter wa'etransformers si-es that may be used to match the load to the line of the transformer are properlypositioned.

a. 22 ohm *2 ohm

b. "1 ohm *+.( ohm

c. 2.2 ohm 12.01 ohm

d. 12."2 ohm 2.0 ohm

2+0. 8 balanced load of ++ ohm pure resistance is fed through a balanced ++ ohm transmission linewhich is + electrical degree long. he balanced ++ ohm transmission line is in turn fed from a (+ ohmcoa#ial line by means of a half7wa'e balancing section. What is the standing wa'e ratio on the ++ ohmline?

a. 1.+

b. 2.(

c. 1.(

d. 2.+

2+*. =i'en cascaded circuitU first stage is a filter circuit with insertion loss of " d& followed by an amplifierwith a gain of 1+ d& and followed by cable ha'ing an insertion loss of 1 d&. If the input power of the filtercircuit is 1 mW find the total insertion loss.

a. d&m


49/124

b. ( d&m

c. 0 d&m

d. 2 d&m

2+. or a short circuited line or open circuited line the standing wa'e ratio 'alue is always !!!!!.

a. Hnity

b. Infinity

c. Zero

d. Cannot be determined

21+. If the 'oltage reading at a particular section of a transmission line is ma#imum the current reading

should be$

a. 6a#imum

b. 6inimum

c. 8'erage

d. Zero

211. If fi'e signals entered to an E7de'ice at " d&m each find the output power in d&m.

a. 12 d&m

b. 11 d&m

c. 1+ d&m

d. * d&m

212. =i'en incident power of +.% mW and insertion loss of " d& find the transmitted power.

a. +.2 mW

b. +." mW

c. +.% mW

d. +.( mW

21". he reflected 'oltage and reflected current along the transmission line are always$


50/124

a. 1*+oout of phase

b. In phase

c. )ame 'alue

d. +oin phase

21%. If the direction of the reflection coefficient is +o the nature of the lien is

a. Resisti'e

b. 5urely inducti'e

c. 5urely capaciti'e

d.


51/124

21*. he 'elocity of light is 'ery nearly " # 1+*m@s in a 'acuum and !!! in all other media.

a. ,igher

b. )lower

c. )ame

d. 8ll of these

21. 8t a point e#actly a quarter7wa'elength from the load the current is !!!!!!.

a. 1*+ degrees in of phase

b. 1*+ degrees out of phase

c. 5ermanently -ero

d.


52/124

d.


53/124

b. ".2

c. 1.(

d. 2.

22*. Which of the following will you choose in order to minimi-e mismatch?

a. )WR L 1.%

b. 1 L +.*1

c. Return loss L 2+ d&

d.


54/124

2"2. he term !!!!!!!!! implies a sine wa'e of constant amplitude phase and frequency.

a. )teady state

b. )tate of constant

c. )tate of calamity

d. Constant sine wa'e

2"". Is defined as the ratio of the reflected signal to the incident signal.

a. /)WR

b. )WR


d.


55/124


56/124

c. Combiner

d. attenuator

2%2. 8 transmission line ha'ing air dielectric is operated at a frequency of 11+ 6,-. What is the phaseshift constant of the line is degrees per inch?

a. 2.(

b. "."(

c. %.

d. 1.2(

2%". Consider the three networs in series the first is an attenuator with a 12 d& loss the second networis an amplifier with "( d& gain and the third has an insertion loss of 1+ d&. he input of the first networ

is % mWU what is the output of the third networ in watts?

a. +.0* W

b. +.++0* W

c. +.+0* W

d. 0* W

2%%. Is a power le'el related to 1 mW.

a. d&

b. d&m

c. d&6

d. d&W

2%(. 8 transmission unit used in a number of


57/124

a. + d&m

b. 1( d&m

c. 2" d&m

d. "" d&m

2%0. 4etermines how the 'oltage or current decreases with distance

a. 5hase7shift coefficient

b. 8ttenuation coefficient

c. 5ropagation coefficient

d. ine primary constant

d. Reactances


58/124

(0!. #!0 d/(0(. !(03. !0 d/

(04. #3 d/(05. PA diode(06. 3! o&%1 80.5 o&%(07. !.5(08. 6 d/%(09. AnBnity(!0. ?ini%u%(!!. !0 d/%(!(. 0.( %(!3. !80oout o -&a*e(!4. Purely inductive(!5. Coaial cable1 *tri-line1

$ave'uide(!6. 7 d/%(!7. +ll o t&e above(!8. )lo$er(!9. Per%anently zero((0. )tub((!. eon(((. )ur'e i%-edance((3. 4.3 d/((4. )%it& c&art((5. &en return lo** i* 0 d/

((6. 3.! d/((7. !.56((8. ! < 0.8!

((9. #(3 d/%(30. 3(! o&%*(3!. 0.(5(3(. )teady *tate(33. eection coefcient(34. ran*%i**ion lo**(35. Fecrea*e(36. P&illi- H. )%it&(37. or%alized(38. !3 d/(39. =oad(40. An*ertion lo**

(4!. Firectional cou-ler(4(. 3.35(43. 0.0798 (44. d/%(45. e-er(46. d. 33 d/%(47. +ttenuation coefcient(48. P&a*e#*&it coefcient(49. Pro-a'ation coefcient(50. =ine -ri%ary con*tant

2(1. What is the characteristic impedance of a single wire with diameter d L +.2( mm placed at the centerbetween parallel planes separated by 1 mm apart? he wire is held by a material with a 'elocity factor of+.0(?

a. 0( ohms


59/124

b. 12+ ohms

c. 1++ ohms

d. "++ ohms

2(2. here is an improper impedance match between a "+ W transmitter and the antenna and ( W isreflected. ,ow much power is actually transmitted?

a. "( W

b. 2( W

c. "+ W

d. 2+ W

2(". What is the actual length in feet of a one quarter7wa'elength of a coa# with a 'elocity factor of +.at %+ 6,-?

a. .1(

b. %.2%%

c. (.+%

d. 1.0%

2(%. 8 quarter7wa'e line is connected to an R generator and is shorted out at the far end. What is the

input impedance to the line at the generator?

a. 8 low 'alue of resistance

b. 8 high 'alue of resistance

c. 8 capaciti'e reactance which is equal in 'alue to the lineGs surge impedance

d. 8 'alue of resistance equal to the characteristic impedance of the line

2((. 8 coa#ial cable has a capacitance of +p@m and a characteristic impedance of 0( ohms. ind the

inductance of a 2m length.

a. 1.+1" u,

b. %(+ n,

c. (+.2( n,

d. 22( n,


60/124

2(. If the )WR on a transmission line has high 'alue the reason could be

a. 8n impedance mismatch between the line and the load

b. hat the line is nonresonant

c. 8 reflection coefficient of -ero at the load

d. 8 high degree of attenuation between the load and the position where the )WR is

measured

2(0. Calculate the 'elocity factor of a coa#ial cable used as a transmission line with the characteristicimpedance of (+ ohmsU capacitance is %+ p@m and an inductance equal to (+ micro,@m.

a. +.0%(+

b. +.0(+%

c. +.+0%(

d. +.+%0(

2(*. If a quarter7wa'e transmission line is shorted at one end

a. here is minimum current at the shorted end

b. he line beha'es as a parallel7tuned circuit in relation to the generator

c. he line beha'es as a series tuned circuit in relation to the generator

d. here is a ma#imum 'oltage at the shorted end

2(. What is the 'elocity factor for a cable with a eflon dielectric 9relati'e permitti'ity L 2.1:?

a. +.

b. +.%0

c. 2.1

d. 1.%%

2+. 8 (+7ohm transmission line is feeding an antenna which represents a (+7ohm resisti'e load. oshorten the line the length must be

a. 8ny con'enient 'alue

b. 8n odd7multiple of three7quarters of a wa'elength


61/124

c. 8n e'en multiple of a quarter of a wa'elength

d. 8n odd multiple of an eight of a wa'elength

21. 8 feature of an infinite transmission line is that

a. Its input impedance at the generator is equal to the lineGs surge impedance

b. Its phase 'elocity is greater than the 'elocity of light

c. he impedance 'aries at different positions on the line

d. he input impedance is equi'alent to a short circuit

22. he outer conductor of the coa#ial cable is usually grounded

a. 8t the beginning and at the end of the cable

b. Bnly at the beginning of the cable

c. Bnly at the end of the cable

d. he outer conductor must ne'er be grounded

2". What is the impedance of a balance %7wire with a diameter of +.2( cm and spaced 2.( cm apartusing an insulator with a dielectric constant of 2.(?

a. 1++ ohms

b. 1+.( ohms

c. **." ohms

d. 2(.* ohms

2%. 8n attenuator has a loss of 2 d&. If a power of " W is applied to the attenuator find the outputpower.

a. 1.( watts

b. 0.(% milliwatts

c. 11% watts

d. (.%( watts

2(. When surge impedance of a line is matched to a load the line will


62/124

a. ransfer ma#imum current to the load

b. ransfer ma#imum 'oltage to the load

c. ransfer ma#imum power to the load

d. ,a'e a /)WR equal to -ero

2. 8 lossless line is terminated by a resisti'e load which is not equal to the surge impedance. If the'alue of the reflection coefficient is +.( the /)WR is

a. 2

b. "

c. 1.(

d. (

20. he best insulation at H, is

a. &lac rubber

b. &aelite

c. 5aper

d. 6ica

2*.


63/124

d. +.12% m

20+.


64/124

b. %".0 m

c. % cm

d. %+ cm

20(. What would be the appro#imate series impedance of a quarter7wa'e matching line used to match a++ ohm7feed to 0+ ohm7antenna?

a. 2+( ohms

b. 21+ ohms

c. 2(.** ohms

d. 1+2.( ohms

20. Which of the following represents the best )WR?

a. 1$1

b. 1$2

c. 1$1(

d. 2$1

200. 8n optical domain reflectometer display shows a discontinuity 1.% microsecond s from the start. If theline has a 'elocity factor of +.2 how far is the fault from the reflecto meter?

a. 1* m

b. 1".2 m

c. 21+ m

d. "* m

20*. 8 high )WR creates losses in a transmission line. 8 high standing wa'e ratio might be caused by

a. Improper turns ratio between primary and secondary in the plate tan transformer

b. )creen grid current flow

c. 8n antenna electrically too long for its frequency

d. 8n impedance mismatch


65/124

20. 8 properly connected transmission line

a. Is grounded at the transmitter end

b. Is cut to a harmonic of the carrier frequency

c. Is cut to an e'en harmonic of the carrier frequency

d. ,as a standing wa'e ratio as near as 1$1 as possible

2*+. If a X wa'elength transmission is shorted at one end the impedance at the open will be

a. Zero

b. Infinite

c. 4ecreased

d. Increased

2*1. he characteristic impedance of a transmission line does not depend upon its

a. >ength

b. Conductor diameter

c. Conductor spacing

d.


66/124

d. >ine efficiency

2*%. 8 series tuned circuit operating at a frequency of 1 =,- is to be constructed from a shorted sectionof eflon7dielectric coa#ial cable. What length should be used? 9 relati'e dielectric L 2.1:

a. +."2(m

b. +.1+ m

c. +.210 m

d. +.1%" m

2*(. 8 0( ohm line is terminated in a "+ ohm resistance. ind the )WR.

a. +.

b. +.%2

c. 2.(

d. +.%

2*. 8 generator sends (+ mW down a (+ ohm line. he generator is matched to the line but the load isnot. If the coefficient of reflection is +. how much power is reflected?

a. 1* mW

b. 2+ mW

c. "+ mW

d. "2 mW

2*0. 8t 'ery high frequencies transmission lines are used as

a. uned circuits

b. 8ntennas

c. Insulators

d. Resistors

2**. ransmission line shielding is grounded

a. 8t the input only


67/124

b. 8t both the input and output

c. 8t the output only

d. If the antenna is a 6arconi design

2*. 8 shorted quarter7wa'e line at the operating frequency acts lie a9an:

a. )eries resonant circuit

b. 5arallel resonant circuit

c. Capacitor

d. Inductor

2+. 8 transmitter is required to deli'er 1++ W to an antenna through ( m of coa#ial cable with a loss of "

d& @ 1++ m. What must be the output power of the transmitter assuming the line is matched?

a. 1" W

b. 1(" W

c. 1(1 W

d. 11.*1( W

21. 8 generator sends (+ mW down a (+ ohm line. he generator is matched to the line but the load isnot. If the coefficient of reflection is +.2( how much power is dissipated in the load?

a. %. mW

b. "0.( mW

c. ".12( mW

d. 12.( mW

22. 4etermine the 3 of an antenna if it has a bandwidth of +.+ 6,- and is cut to a frequency of "+6,-.

a. (+

b. 1++

c. 1(+

d. 2(+


68/124

2". he main disad'antage of the two7hole directional coupler is

a. >ow directional coupling

b. 5oor directi'ity

c. ,igh )WR

d.


69/124

c. 8 capacitance at some specific distance from the load

d. 8 short7circuited stub at some specific distance from the load

2*. Calculate the impedance seen looing into a 0( ohm line 1 m long terminated in a load impedance of1++ ohms if the line has a 'elocity factor +f +.* and operates at a frequency of "+ 6,-.

a. 02 7 O21 ohms

b. 0( 7 O2( ohms

c. %+ 7 O"+ ohms

d. (+ 7 O2( ohms

2. he 'elocity factor of a transmission line

a. 4epends on the dielectric of the material used

b. Increases the 'elocity along the transmission line

c. Is go'erned by the sin effect

d. Is higher for a solid dielectric than for air

"++. 8 transmitter supplies (+ W to a load through a line with an )WR of %$1. ind the power absorbed bythe load.

a. "2 W

b. (. W

c. %%.% W

d. 1* W

(5!. 75 o&%*(5(. 30

(53. 4.(44(54. + &i'& value o re*i*tance(55. !.0!3 uH(56. +n i%-edance %i*%atc& bet$eent&e line and t&e load(57. 0.0745(58. &e line be&ave* a* a -arallel#tuned circuit in relation to t&e'enerator

(59. 0.69(60. +ny convenient value

(6!. At* in-ut i%-edance at t&e'enerator i* eual to t&e line* *ur'ei%-edance(6(. +t t&e be'innin' and at t&e endo t&e cable(63. !00 o&%*(64. 7.54 %illi$att*(65. ran*er %ai%u% -o$er to t&eload


70/124

(66. 3(67. ?ica(68. A* t&e -roduct o t&e *ur'ei%-edance and t&e lien current(69. 0.066 %(70. Prevent %oi*ture ro% enterin'

t&e line(7!. I $avelen't&(7(. /ot& + and /(73. 6 $att*(74. 43.7 %(75. (05 o&%*(76. !D!(77. !93.( %(78. +n i%-edance %i*%atc&(79. Ha* a *tandin' $ave ratio a*near a* !D! a* -o**ible(80. AnBnite

(8!. =en't&(8(. !(0 o&%*

(83. eection coefcient(84. 0.!0 %(85. (.5(86. !8 %(87. uned circuit*(88. +t bot& t&e in-ut and out-ut

(89. Parallel re*onant circuit(90. !36 (9!. 46.9 %(9(. 50(93. arro$ band$idt&(94. )erie* re*onant circuit(95. ! J 0.(5 o&%*(96. )tandin' $ave*(97. + *&ort#circuited *tub at *o%e*-eciBc di*tance ro% t&e load(98. 7( # >(! o&%*(99. Fe-end* on t&e dielectric o t&e

%aterial u*ed300. 3(

"+1. Category of media with some form of conductor that pro'ides a conduit in which electromagneticsignals are contained.

8. =uided

&. &alanced

C. Hnguided

4. Hnbalanced

"+2. he conducti'e connections between elements which carry signals.

8. ransmission >ines

&. 8ntenna

C. requency allocations

4. >oad

"+". Calculate the characteristic impedance for a line that e#hibits an inductance of % n,@m and 1.( p@m


71/124

8. ". ohms

&. (1. ohms

C. 22 ohms

4. 2%.( ohms

"+%. Category of media which are wireless

8. =uided

&. &alanced

C. Hnguided

4. Hnbalanced

"+(. It is a medium or any physical facility used to propagate electromagnetic signals between twolocations in a communications system.

8. ransmission medium

&. Channel allocation

C. requency allocation

4. 8ny of these

"+. It is a metallic conductor system used to transfer electrical energy from one point to another usingelectrical current flow.

8. ransmitter

&. 6ultiple#ers

C. Recei'er

4. ransmission line

"+0. 8 ind of wa'e where the displacement is in the direction of propagation.

8. rans'erse

&. >ongitudinal

C. Re'erse


72/124

4. 5erpendicular

"+*. Calculate the capacitance per meter of a (+7ohm load cable that has an inductance of (( n,@m.

8. 1" p

&. 1* p

C. 2+ p

4. 22 p

"+. he desirable )WR on a transmission line is

8. +

&. 1

C. 2

4. Infinity

"1+. 8 ind of wa'e where the direction is displacement is perpendicular to the direction of propagation.

8. rans'erse

&. >ongitudinal

C. Re'erse

4. 5erpendicular

"11. 8 short7circuited half7wa'elength line acts lie a

8. 5arallel resonant circuit

&. )eries Resonant Circuit

C. Bscillator

4. >C circuit

"12. ;lectromagnetic wa'es that tra'el along a transmission line from the source to the load.

8. Re'erse wa'es

&. rans'erse wa'es


73/124

C. Incident wa'es

4. >ongitudinal wa'es

"1". ;lectromagnetic wa'es that tra'el from the load bac toward the source.

8. Incident wa'es

&. rans'erse wa'es

C. orward wa'es

4. Reflected wa'es

"1%. )ound tra'els appro#imately

8. 22++ feet per second

&. 11++ feet per second

C. ((+ feet per second

4. ++ feet per second

"1(. 4etermine the surge impedance for a parallel wire air dielectric with a ratio of the spacing betweenconductors and the diameter of ".

8. 2(+ ohms

&. 21+ ohms

C. 1*+ ohms

4. 21( ohms

"1. he rate at which the periodic wa'e repeats

8. Wa'elength

&. 8mplitude

C. 5eriod

4. requency

"10. he distance of one cycle occurring in space

8. Wa'elength


74/124

&. 8mplitudes

C. 5eriod

4. requency

"1*. Classification of transmission line where both conductors carry currentU one conductor carries thesignal the other conductor is the return path

8. 4ifferential transmission lines

&. Hnbalanced lines

C. Coa#ial cables

4. &alun

"1. 8 shorted half7wa'e line at the operating frequency acts lie

8. Capacitor

&. Inductor

C. )eries resonant circuit


"2+. What is the characteristic impedance of a coa#ial line air dielectric with a ratio of the diameter of theouter and inner conductor equal to 1.(?

8. 2%." ohms

&. 2(. ohms

C. 1".2 ohms

4. 1* ohms

"21. Currents that flow in opposite direction in a balanced wire pair is called

8. >ongitudinal currents

&. Re'erse circuit currents

C. rans'erse circuit currents

4. 6etallic circuit currents


75/124

"22. Currents that flow in same direction in a balanced wire pair is called

8. >ongitudinal currents

&. Re'erse circuit currents

C. rans'erse circuit currents

4. In7phase currents

"2". 8 circuit de'ice used to connect a balanced transmission line to an unbalanced load

8. )lotted lines

&. )tub

C. &alun

4. 3uarterwa'e lines

"2%. he most common type of balun used in relati'ely high frequency

8.


76/124

C. Coa#ial cables

4. win pair

"20. 8 type of parallel7conductor transmission lines which is essentially the same as open7wiretransmission line e#cept that the spacers between the conductors are replaced with a continuous solid

dielectric that ensures uniform spacing along the entire cable

8. wisted pair

&. Bpen7wire lines

C. Coa#ial cables

4. win lead

"2*. What is the range of si-e of wires of a twisted pair?

8. 8W= 1 to 8W= 2

&. 8W= 1% to 8W= 2(

C. 8W= 1+ to 8W= 2+

4. 8W= 12 to 8W= 2*

"2. What is the characteristic impedance of a coa#ial line polyethylene dielectric with the ratio of thediameter of the outer and the inner conductor of 2.(?

8. %".( ohms

&. 2".% ohms

C. ".2 ohms

4. 2.* ohms

""+. In 8W= the higher the wire gauge !!!!!!

8. he higher the diameter and the lower the resistance

&. he smaller the diameter and the higher the resistance

C. he smaller the diameter and the higher the conductance

4. he larger the diameter and the higher the resistance

""1. ype of twisted pair wire cable that consists of two copper wires where each wire is separatelyencapsulated in 5/C insulation.


77/124

8. )hielded twisted pair

&. win lead

C. Hnshielded twisted pair

4. Bpen wire frame

""2. 8 shorted quarter7wa'e line at the operating frequency acts lie

8. )eries resonant circuit

&. 5arallel resonant circuit

C. Capacitor

4. Inductor

""". he minimum number of twist for H5 is

8. wo twist per foot

&. wo twist per meter

C. hree twist per foot

4. hree twist per meter

""%. 8 delay line using R=7*8@H cable is to e#hibit a (7ns delay. Calculate the required length of thecable.

8. %.(0 ft.

&. 1.2" ft.

C. .2 ft.

4. ".% ft.

""(. 8n open7circuited quarter7wa'elength line acts lie a


&. )eries resonant circuit

C. Bscillator

4. >C circuit


78/124

"". >e'el for category of H5 cable which is suitable only for 'oice grade telephone signals and 'erylow7speed data applications

8. >e'el 1 or Cat 1

&. >e'el " or Cat "

C. >e'el 2 or Cat 2

4. Cat %

""0. 8n antenna is being fed by a properly terminated two7wire transmission line. he current in the line atthe input end is " 8. he surge impedance of the line is (++ ohms. ,ow much power is being supplied tothe line?

8. ".1 W

&. 2.( W

C. 1. W

4. %.( W

""*. >e'el or Category of H5 cable which was de'eloped for I;;; *+2.( toen ring local area networsoperating at a transmission rates of %6bps

8. >e'el 1 or Cat 1

&. >e'el " or Cat "

C. >e'el 2 or Cat 2

4. Cat %

"". If the period of one complete cycle of a radio wa'e is +.+++++1 s what is the wa'elength?

8. "++ m

&. 2++ m

C. 1++ m

4. %++ m

"%+. If the two towers of a (+7,- antenna are separated by 12+ electrical degrees what is the towerseparation in feet?

8. 2"1 ft.


79/124

&. 2"( ft.

C. 10 ft.

4. "%( ft.

"%1. Category of H5 used for 'irtually any 'oice or data transmission rate up to 1 6bps has aminimum of " turns per inch.

8. Category (e

&. Category %

C. Category (

4. Category "

"%2. he mismatch between the antenna and transmission line impedances cannot be corrected for by

8. Hsing an >C matching networ

&. 8dOusting antenna length

C. Hsing a balun

4. 8dOusting the length of transmission line

"%". Category of H5 that was designed for data transmission rates up to 2+ 6bps

8. Category (e

&. Category %

C. Category (

4. Category "

"%%. /ariation of C8( cables that are intended for data transmission rates up to 2(+ 6bps

8. Category (e

&. Category 2

C. Category

4. Category "


80/124

"%(. 8 type of twisted7pair wherein its wires and dielectric are enclosed in a conducti'e metal slee'ecalled a foil.

8. )5

&. win lead

C. H5

4. Hnshielded win lead

"%. It is the name gi'en to the area between the ceiling and the roof in a single7story building or betweenthe ceiling and the f loor of the ne#t higher le'el in a multistory building.

8. 8ttic

&. Rooftop

C. 5lenum

4. Ceiling

"%0. It consists of center conductor surrounded by dielectric material then a concentric shielding and anen'ironmental protection outer Oacet.

8. wisted pair

&. Coa#ial cable

C. win lead

4. Bpen wire

"%*. In a transmission line it refers to the wo'en stranded mesh or braid that surround some types ofcoa#ial cables

8. =rounding

&. )hielding

C. 4egaussing

4. 8ny of these

"%. 8 coa#ial cable with one layer of foil insulation and one layer of braided shielding.

8. &acup shielding

&. emporary shielding


81/124

C. 4ual shielding

4. Interference shielding

"(+. 8t 'ery high frequencies transmission lines are used as

8. uned circuits

&. 8ntennas

C. Insulators

4. Resistors

30!. ,uided30(. ran*%i**ion =ine*303. 5!.6 o&%*

304. Kn'uided305. ran*%i**ion %ediu%306. ran*%i**ion line307. =on'itudinal308. (( -309. !3!0. ran*ver*e3!!. )erie* e*onant Circuit3!(. Ancident $ave*3!3. eected $ave*3!4. !!00 eet -er *econd3!5. (!5 o&%*

3!6. reuency3!7. avelen't&3!8. Fierential tran*%i**ion line*3!9. )erie* re*onant circuit3(0. (4.3 o&%*3(!. ?etallic circuit current*3((. =on'itudinal current*3(3. /alun3(4. +ll o t&e*e3(5. )tandin' $ave*3(6. @-en#$ire line*

3(7. $in lead3(8. +, !6 to +, (63(9. 36.( o&%*

330. &e *%aller t&e dia%eter and t&e&i'&er t&e re*i*tance33!. Kn*&ielded t$i*ted -air33(. Parallel re*onant circuit333. $o t$i*t -er oot334. 3.4 t.335. )erie* re*onant circuit336. =evel ! or Cat !337. 4.5 k338. =evel ( or Cat (339. 300 %340. 345 t.

34!. Cate'ory 334(. +d>u*tin' t&e len't& otran*%i**ion line343. Cate'ory 4344. Cate'ory 5e345. )P346. Plenu%347. Coaial cable348. )&ieldin'349. Fual *&ieldin'350. uned circuit*


82/124

"(1. 8 coa#ial cable with two layers of foil insulation and two layers of braided shielding.

8. 3uad shielding

&. 4ouble shielding

C. riple shielding

4. )hielding

"(2. 8 type of coa#ial cable that has a tubular outer conductor surrounds the center conductor coa#iallyand the insulating material is air.

8. Rigid air coa#ial cable

&. =as7filled coa#ial cable

C. )olid coa#ial cable

4. le#ible cable

"(". If the length of an open7circuited stub is less than quarter7wa'elength but greater than + the stubbeha'es as

8. Inductor

&. Capacitor

C. Resistor

4. Comple#

"(%. ype of coa#ial cable where the outer conductor is braided fle#ible and coa#ial to the centerconductor.

8. =as7filled coa#ial cable

&. Rigid air coa#ial cable

C. )olid fle#ible coa#ial cable

4. le#ible cable

"((. 8 (+7ohm coa# is connected to a 0"7ohm antenna. he )WR is

8. +.*(


83/124

&. 1

C. 1.%

4. 2.2

"(. 4efined as the impedance seen looing at an infinitely long line or the impedance seen looing into afinite length of the line that is terminated in a purely resisti'e load with the resistance equal to thecharacteristic impedance of the line.

8. Input impedance

&. )urge impedance

C. Butput impedance

4. Circuit impedance

"(0. 4etermine the characteristic impedance for an air dielectric two7wire parallel transmission line with a4@r ratio of 12.22

8. 1(+ ohms

&. 12+ ohms

C. 0( ohms

4. "++ ohms

"(*. 4etermine the characteristic impedance for an R=7(8 coa#ial cable with the followingspecifications$ d L +.+2( inches 4 L +.1( inches and dielectric constant of 2.2"

8. 12+ ohms

&. 02 ohms

C. 1(+ ohms

4. 0( ohms

"(. 4etermine the characteristic impedance for an R=7(8 coa#ial cable with the followingspecifications$ >L+.11* u,@ft and C L 21 p@ft

8. 1(+ ohms

&. 02 ohms

C. 0( ohms


84/124

4. 1++ ohms

"+. It is used to e#press the attenuation or signal loss and the phase shift per unit length of thetransmission line.

8. 5ropagation coefficient

&. 5ropagation constant

C. 5ropagation factor

4. 8ny of these

"1. or matched condition what is the relationship of load and characteristic impedance?

8. =reater than

&. >ess than

C. ;qual

4. Impossible to say

"2. It is defined simply as the ratio of the actual 'elocity of propagation of an electromagnetic wa'ethrough a gi'en medium to the 'elocity of propagation through a 'acuum or free space.

8. /elocity factor

&. /elocity propagation

C. Inde# of refraction

4. 5hase delay

"". It is simply the permitti'ity of the material

8. 5ermitti'ity

&. Insulation constant

C. 4ielectric constant

4. Resisti'ity

"%. or a gi'en length of R= *8@H coa#ial cable with distributed capacitance of . p@m a distributedinductance of 2%1.( n,@m and a relati'e dielectric constant of 2." determine the 'elocity of propagation.

8. 1.+0 # 1+Y* m@s


85/124

&. 2." # 1+Y0 m@s

C. ".2* # 1+Y* m@s

4. 2.+0 # 1+Y* m@s

"(. or a gi'en length of R= *8@H coa#ial cable with distributed capacitance of . p@m a distributedinductance of 2%1.( n,@m and a relati'e dielectric constant of 2." determine the 'elocity factor

8. 1.2

&. +.

C. +.0

4. +.(

". If the length of an open7circuited stub is greater than quarter7wa'elength but less than half7wa'elength the stub beha'es as

8. Inductor

&. Capacitor

C. Resistor

4. Comple#

"0. 4elay line is a function of what two parameters?

8. Resistance and capacitance

&. Resistance and susceptance

C. Inductance and resistance

4. Inductance and capacitance

"*. ,ow is the time delay calculated in a coa#ial cables with a dielectric constant of +.?

8. +.( sec

&. +.0 sec

C. +.%( sec

4. 1.2 sec


86/124

". hree feet is one wa'elength at a frequency of

8. 1++ 6,-

&. 1% 6,-

C. "++ 6,-

4. "2* 6,-

"0+. When current flows through a conductor the loss introduced as a function of resistance and currentis called !!!!!!!.

8. Inductance loss

&. Conductor loss

C. /oltage loss

4. )in effect

"01. or ma#imum absorption of power at the antenna the relationship between the characteristicimpedance of the line Zo and the load impedance Z> should be

8. Zo L Z>

&. Zo M Z>

C. Zo N Z>

4. Zo L +

"02. he ratio of the 8C resistance and the 4C resistance.

8. Impedance ratio

&. )usceptance ratio

C. Resistance ratio

4. Conductance ratio

"0". he difference in potential between two conductors of a metallic transmission line causes !!!!!!.

8. Conductor loss

&. 4ielectric heating


87/124

C. Radiation loss

4. Corona

"0%. If the length of a short7circuited stub is greater than quarter7wa'elength but less than half7wa'elength the stub beha'es as

8. Inductor

&. Capacitor

C. Resistor

4. Comple#

"0(. If the separation between the conductors in a metallic transmission line is an appreciable fraction ofa wa'elength the electrostatic and electromagnetic fields that surround the conductor cause the line to

act as if it were an antenna and transfer energy to any nearby material. his energy radiated is called!!!!!!.

8. Radiation loss

&. 5ower loss

C. Coupling loss

4. Corona

"0. he minimum 'oltage along a transmission line is 2+ / while the ma#imum is "+ /. he )WR is

8. +.0

&. 1.+

C. 1.2

4. 1.(

"00. It occurs whene'er a connection is made to or from a transmission line or when two sections oftransmission line are connected together.

8. 5ower loss

&. Coupling loss

C. Radiation loss

4. Resistance loss


88/124

"0*. Which of the following is not a common transmission line impedance?

8. (+ ohms

&. 0( ohms

C. 12+ ohms

4. "++ ohms

"0. It is a luminous discharge that occurs between the two conductors of a transmission line when thedifference in potential between them e#ceeds the breadown 'oltage of a dielectric insulator.

8. Resistance loss

&. Corona

C. Radiation loss

4. 5ower loss

"*+. /oltage that propagates down the load.

8. Reflected 'oltage

&. )tanding wa'e ratio

C. Incident 'oltage

4. Reflection 'oltage

"*1. /oltage that propagates from the load towards the source.

8. Reflected 'oltage


C. Reflection coefficient

4. Incident 'oltage

"*2. 8 transmission line with no reflected power.

8. lat

&. Resisti'e

C.


89/124

4. 8ny of these

"*". It is a 'ector quantity that represents the ratio of reflected 'oltage to incident 'oltage or the reflectedcurrent and the incident current

8. Reflection coefficient

&. Reacti'e load diagram

C. )tanding wa'e ratio

4. ra'eling wa'es

"*%. With a mismatched line two electromagnetic wa'es tra'eling in opposite direction present on theline on the same time.

8. )tanding wa'e ratio

&. Reflection coefficient

C. )tanding wa'es

4. ra'eling wa'es

"*(. he two tra'eling wa'es sets up an interference pattern called !!!!!!!.


&. Reflection coefficient

C. )tanding wa'es

4. ra'eling wa'es

"*. It is defined as the ratio of the ma#imum 'oltage to the minimum 'oltage or the ma#imum current tothe minimum current of a standing wa'e in a transmission line.


&.


90/124

&. +.

C. +.(

4. +.0

"**. 8 ratio e#pressing the percentage of incident 'oltage reflected on a transmission line is nown as the

8. /elocity factor


C. Reflection coefficient

4. >ine efficiency

"*. here is an impedance in'ersion in e'ery !!!!!!.

8. ,alf wa'elength

&. 3uarter wa'elength

C. ull wa'elength

4. hree7eights of a wa'elength

"+. he characteristic impedance of a transmission line does not depend upon its

8. >ength

&. Conductor diameter

C. Conductor spacing

4.


91/124

8. Hse stub matching

&. Hse a slotted line

C. Hsed a 37section

4. Hse an open circuited lines

"". 8 technique that can be used to locate an impairment in metallic cable.

8. 4R

&. Wattmeter

C. /oltmeter

4. )WR meter

"%. 8 pulse is transmitted down a cable that has a 'elocity of propagation of +.*c. he reflected signal isrecei'ed 1us later. ,ow far down the cable is the impairment?

8. 2%+ m

&. 1( m

C. + m

4. 12+ m

"(. Hsing 4R a transmission line impairment is located "+++m from the source. or a 'elocitypropagation of +. c determine the time elapsed from the beginning of the pulse to the reception of theecho

8. 11.11 us

&. 1+.12 us

C. 22.22 us

4. 21.1% us

". 8 flat conductor separated from a ground plane by an insulating dielectric material.

8. )tripline

&. Wa'eguide

C. 6icrostrip


92/124

4. Coa#ial cable

"0. 8 flat conductor sandwich between two ground planes.

8. )tripline

&. Wa'eguide

C. 6icrostrip

4. Coa#ial cable

"*. Indicate the false statement. he )WR on a transmission line is infinityU the line is terminated in

8. 8 short circuit

&. 8 comple# impedance

C. 8n open circuit

4. 8 pure reactance

". he most commonly used transmission line is a

8. wo7wire balance line

&. )inge wire

C. hree7wire line

4. Coa#

%++. 8 short7circuited half7wa'elength line acts lie a



C. Bscillator

4. >C circuit

35!. "uad *&ieldin'35(. i'id air coaial cable353. Ca-acitor354. )olid eible coaial cable355. !.46356. )ur'e i%-edance

357. 300 o&%*358. 7( o&%*359. 75 o&%*360. +ny o t&e*e36!. :ual36(. 2elocity actor


93/124

363. Fielectric con*tant364. (.07 !0L8 %E*365. 0.66366. Anductor367. Anductance and ca-acitance368. 0.67 *ec

369. 3(8 ?Hz370. Conductor lo**37!. ;o < ;=37(. e*i*tance ratio373. Fielectric &eatin'374. Ca-acitor375. adiation lo**376. !.5377. Cou-lin' lo**378. !(0 o&%*379. Corona380. Ancident volta'e

38!. eected volta'e

38(. +ny o t&e*e383. eection coefcient384. ravelin' $ave*385. )tandin' $ave*386. )tandin' $ave ratio387. 0.6

388. eection coefcient389. "uarter $avelen't&390. =en't&39!. "uarter#$avelen't& tran*or%er39(. K*e *tub %atc&in'393. F394. !(0 %395. ((.(( u*396. ?icro*tri-397. )tri-line398. + co%-le i%-edance399. Coa

400. )erie* re*onant circuit

%+1. 8 90( 7 O(+:7ohm is connected to a coa#ial transmission line of Zo L 0( ohms at 1+ =,-. he bestmethod of matching consists of connecting

8. 8 short7circuited stub at the load

&. 8n inducti'e at the load

C. 8 capacitance at some specific distance from the load

4. 8 short7circuited stub at some specific distance from the load

%+2. he 'elocity factor of a transmission line

8. 4epends on the dielectric constant of the material used

&. Increases in 'elocity along the transmission line

C. Is go'erned by the sin effect

4. Is higher for a solid dielectric than for air.

%+". Impedance in'ersion may be obtained with

8. 8 short7circuited stub


94/124

&. 8n open7circuited stub

C. 8 quarter7wa'e line

4. 8 half7wa'e line

%+%. he most desirable reflection coefficient is

8. +

&. +.(

C. 1

4. Infinity

%+(. )hort circuited stubs are preferred to open7circuited stub because the latter are

8. 6ore difficult to mae and connect

&. 6ade of a transmission line with different characteristic impedance

C. >iable to radiate

4. Incapable of gi'ing a full range of reactance

%+. or transmission7line load matching o'er a range of frequencies it is best to use a

8. &alun

&. &roadband directional coupler

C. 4ouble stub

4. )ingle stub of adOustable position

%+0. he main disad'antage of the two7hole directional coupler is

8. >ow directional coupling

&. 5oor directi'ity

C. ,igh )WR

4.


95/124

8. )lotted line

&. &alun

C. 4irectional coupler

4. 3uarter7wa'e transformer

%+. 8 short7circuited quarter7wa'elength line acts lie a



C. Bscillator

4. >C circuit

%1+. If the length of a short7circuited stub is less than a quarter7wa'elength but greater than + the stubbeha'es as

8. Inductor

&. Capacitor

C. Resistor

4. Comple#

%11. he depth of penetration of current density resulting from sin effect

8. )in depth

&. Wire depth

C. >ine depth

4. 6edium depth

%12. ransmission line must be matched to the load to

8. ransfer ma#imum 'oltage to the load

&. ransfer ma#imum current to the load

C. Reduce the load current

4. ransfer ma#imum power to the load


96/124

%1". Referred to the dielectric constant of a transmission line material

8. Inductance and capacitance

&. /elocity factor

C. Characteristic impedance

4. 5ropagation 'elocity

%1%. 8 transmission line containing of two conductors that ha'e equal resistance per unit length

8. Hnbalanced line

&. Bpen7wire line

C. &alanced line

4. Coa#ial cable

%1(. Which of the following determines the characteristics of a transmission line?

8. Inductance

&. Capacitance

C. 5hysical dimension

4. >ength

%1. Category of H5 that was designed for data transmission rates up to 2+ 6bps

8. Category (e

&. Category %

C. Category (

4. Category "

%10. >e'el 2 or category 2 H5 cables comply with I&6Gs !!!!!!! specification.

8. ype 1

&. ype "

C. ype 2


97/124

4. ype %

%1*. >e'el " or Category " H5 cables should ha'e at least !!!! twist per inch.

8. 1

&. 2

C. "

4. %

%1. Which of the following is


98/124

C. Capaciti'e


%2". 8 short7circuited transmission line less than quarter7wa'elength long.

8. Inducti'e

&. Capaciti'e

C. 5arallel resonant circuit

4. )eries resonant circuit

%2%. he quarter7wa'elength transformer line acts as a transformer with a 1$1 turns ratio when the loadresistance is with what relationship with the characteristic impedance of the quarter7wa'elengthtransformer?

8. ;qual

&. >ess than

C. =reater than

4. ess than

C. =reater than

4.


99/124

8. +.*

&. +.0

C. +.

4. +.

%2*. If a transmission line is not terminated in its characteristic impedance !!!!!!! will de'elop alongthe line.

8. ra'eling wa'es

&. )tanding wa'es

C. )urge impedance

4. Infinite impedance

%2. If a load and a line ha'e mismatched impedances power not absorbed by the load will be !!!!!.

8. 8bsorbed

&. ReOected

C. Reflected

4. Remo'ed

%"+. wo wire line is usually operated in the$

a. &alanced mode

b. Hnbalanced mode

c. ,igh frequency

d.


100/124

d.


101/124

c. 8 quarterwa'e line

d. 8 half7wa'e line

%"0. o be properly matched the ratio of ma#imum to minimum 'oltage along a transmission line shouldbe equal to

a. (+

b. 1+

c. 2

d. 1

%"*. When Z> Zo the power sent down the line toward the load is called the

a. he incident power

b. he reflected power

c. he power dissipation

d. he carrier power

%". or transmission line load matching o'er a range of frequencies it is best to use a

a. &alun

b. &roadband directional coupler

c. 4ouble stub

d. )ingle adOustable stub

%%+. 8 short section of a transmission line open or shorted that is used to match the impedance of theline to that of an antenna or transmitter.

a. )lotted line

b. )tub

c. Wa'etrap

d. >echer wire

%%1. he property of a material that determines how much electrostatic energy can be stored per unit'olume when 'oltage is applied


102/124

a. 5ermeability

b. 6agnetic effect

c. Capacitance

d. 5ermitti'ity

%%2. he 'alue of the total opposition of the transmission media to the flow of electromagnetic field energyis called

a. Characteristic impedance

b. /elocity factor

c. )tanding wa'es

d. Reflected wa'es

%%". When mismatch is great this power actually cause damage to the transmitter or the line itself.

a. he incident power

b. he reflected power

c. he power dissipation

d. he carrier power

%%%. What is the 'elocity factor for non7foam dielectric (+ or 0( ohm fle#ile coa#ial cable such as R= *11 (* and (?

a. 20+

b. +.1+

c. +.

d. +."+

%%(. he measure of the superiority of a material o'er a 'acuum as a path for magnetic lines of force is

a. 5ermitti'ity

b. 5ermeability

c. Conducti'ity


103/124

d. Resisti'ity

%%. he number of standing wa'es on the wire is equal to the length of the wire di'ided by a halfwa'elength. he principle which allows antennas to operate at different frequencies which are integralmultiples of the fundamental frequency is called!!!!!!!.

a. ,armonic operation

b. 4ecimonic operation

c. ;lectromagnetic re'erberation

d. 8synchronous operation

%%0. 8 coa# line has an attenuation of 2.% d& per 1++ ft. the attenuation for 2.0( ft. is !!!!! d&.

a. 2.%

b. %.*

c. "."

d. .

%%*. When a quarter wa'e stub is used to match a ++ ohm antenna to a line of (2 ohms the impedanceof the matching stub must be !!!! ohms.

a. 10

b. 2++

c. 1(+

d. "++

%%. he characteristic impedance of a transmission line is determined by

a. Its length

b. Its height abo'e ground

c. Its physical construction

d. he operating frequency

%(+. When the diameter of two conductors of a two7wire transmission line is held constant the effect ofdecreasing the distance between the conductors is to

a. 4ecrease the impedance


104/124

b. Increase the surge impedance

c. Increase the radiation resistance

d. 4ecrease )WR

40!. + *&ort#circuited *tub at *o%e*-eciBc di*tance ro% t&e load40(. Fe-end* on t&e dielectriccon*tant o t&e %aterial u*ed403. + uarter#$ave line404. 0405. =iable to radiate406. Fouble *tub

407. arro$ band$idt&408. /alun409. Parallel re*onant circuit4!0. Anductor4!!. )kin de-t&4!(. ran*er %ai%u% -o$er to t&eload4!3. Anductance and ca-acitance4!4. /alanced line4!5. P&y*ical di%en*ion4!6. Cate'ory 44!7. y-e 3

4!8. 34!9. edE$&ite *tri-e and red4(0. Cat 74(!. )erie* re*onant circuit4((. Ca-acitive4(3. Anductive4(4. :ual4(5. 50 to (00

4(6. ,reater t&an4(7. 0.84(8. )tandin' $ave*4(9. eected430. /alanced %ode43!. eected43(. e*i*tive load $&o*e re*i*tance i*le** t&an t&e c&aracteri*tic i%-edance

o t&e line433. ran*er* %ai%u% -o$er to t&eload434. +ll o t&e*e435. /alun436. + uarter$ave line437. !438. &e incident -o$er439. Fouble *tub440. )tub44!. Per%ittivity44(. C&aracteri*tic i%-edance

443. &e reected -o$er444. 0.66445. Per%eability446. Har%onic o-eration447. 6.6448. !76449. At* len't&450. Fecrea*e t&e i%-edance


105/124

%(1. Considering a coa#ial transmission line ma#imum 'oltage on the line di'ided by the minimum'oltage equals the

a. Characteristic impedance

b. I)WR

c. /)WR

d. Inducti'e reactance

%(2. In a transmission line if the )WR or ma#imum current to a minimum current ratio of 2$1 the ratio ofthe ma#imum 'oltage to the minimum 'oltage is

a. 1$%

b. %$1

c. 1$2

d. 2$1

%(". ransmission lines are either balanced or unbalanced with respect to

a.


106/124

b. 2** ohms

c. 02 ohms

d. 1%% ohms

%(. 8 radio transmission line of (++ ohms impedance is to be connected to an antenna ha'ing animpedance of 2++ ohms. What is the impedance of a quarter wa'e matching line?

a. "++

b. "1

c. "1.(

d. "1

%(0. he /)WR for a line terminated in its Zo is

a. +

b. 1

c. 1.(

d. Infinity

%(*. Which of the following is used to measure )WR?

a. 6ultimeter

b. Reflectometer

c. )pectrum analy-er

d. Bscilloscope

%(. 8 0( O(+ ohm load is connected to a coa#ial transmission line of Zo L 0( ohms at 1+ =,-. he bestmethod of matching consists in connecting

a. 8 short circuited stub at the load

b. 8 capacitance at some specific distance from the load

c. 8n inductance at the load

d. 8 short7circuited stub at some specific distance from the load


107/124

%+. or a two7wire line Zo is higher when

a. he wire si-e is small with respect to the spacing of the conductors

b. he spacing is 'aried in accordance with the frequency

c. he 4$d ratio is smaller

d. he wire is large with respect to the spacing of the conductors

%1. 8 resultant wa'e due to the combination of incident and reflected wa'e

a. ;lectromagnetic wa'e

b. )ine wa'e

c. )tanding wa'e

d. Current

%2. or transmission line load matching o'er a range of frequencies it is best to use a

a. &alun

b. &roadband directional coupler

c. 4ouble stub

d. )ingle stub

%". If the load impedance matches the characteristic impedance of the line there are !!!!! standingwa'es.

a. 6ore

b. >ess

c.


108/124

d. /oltage standing wa'e ratio

%(. Reflections on a transmission line can occur when

a. Impedance of the source and load are matched

b. Impedance of the source and the load are mismatched

c. Resonance conditions are obtained

d. 5ower transfer between source and load is ma#imum

%. 8 transmission line with characteristic impedance 9Zo: of "++ ohms is terminated in a resistance load9RI:. If by measurement the minimum and ma#imum 'oltage through the load are 12 and 2+ micro 'oltsrespecti'ely what is the )WR?

a. 1.0

b. +.

c. .0

d. ".0

%0. 8 measure of the mismatched between line and load impedance is called as


b. )tanding wa'e ratio

c. >oss

d. )tanding wa'es

%*. ransmission lines when connected to antenna ha'e

a. Capaciti'e load

b. Resisti'e load whose resistance is less than characteristic impedance

c. Resisti'e load at the resonant frequency

d. Resisti'e load whose resistance is greater than the characteristic impedance of the line

%. 8t matched condition )WR is equal to

a. Zero


109/124

b. Bne

c. 1++

d. Infinite

%0+. 8n , transmission line has a characteristic impedance of ++ ohms and is terminated by anantenna. he )WR along the line when the antenna impedance is (++ ohms is

a. 1.2$1

b. 1$2.1

c. 2$1

d. 1$2

%01. 8 characteristic of an infinite transmission line is that

a. he impedance in equals impedance out

b. It carries wa'es at the 'elocity of light

c. It can be connected to mismatched loads

d. he impedance 'aries with the length of the line

%02. 8 quarter wa'e transmission line shorted at the end$

a. ,as the characteristics of parallel tuned circuit

b. ,as the characteristics of a series tuned circuit

c. ,as a minimum current at the end

d. Reflects a low impedance to the supply

%0". he outer conductor of a coa#ial transmission line is usually grounded at the$

a. Input and output

b. Butput only

c. Input only

d. 5oint of infinite resistance

%0%. 8 certain feedline has a high )WR. It can be caused by$


110/124

a. 8n impedance mismatched

b. Hse of non7resonant line

c. 6atching the load to the line

d. ;#cessi'e transmitter output

%0(. If the input impedance of an antenna is "++ ohms and it is fed with a ++ ohm balanced transmissionline the )WR on the line is

a. %

b. "

c. 2

d. +.(

%0. 8 radio transmission line of "++ ohms impedance to be connected to an antenna ha'ing an inputimpedance of 1(+ ohms. he impedance if a quarter wa'e matching line is !!! ohms

a. 212

b. %(+

c. ++

d. 1(+

%00. he ratio of the reflected 'oltage to the incident 'oltage on the transmission line is termed as


b. )tanding wa'e ratio

c. >oss

d. )tanding wa'es

%0*. Indicate the three types of transmission line energy losses

a. Radiation I2R and dielectric ,eating

b. Conductor heating dielectric heating and radiation resistance

c. I2R R> and temperature


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d. 4ielectric separation insulation breadown and radiation

%0. ermination means

a. >oad connected to the output end of a transmission line

b. Result of disconnecting a line from a transmitter

c. >ooing bac impedance of a line with no load

d. Result of cutting both ends of a conductor

%*+. When transmission line uses ground return it is called a@n !!!!! line.

a. Hngrounded

b. Hnbalanced

c. =rounded

d. &alanced

%*1. 5ermeability is the measure of superiority of a material o'er a 'acuum as a path of magnetic lines offorce. he permeability of free space is equal to !!!!! henry@meter

a. 1.2(0 # 1+7

b. 1.(20 # 1+7

c. 0.2(1 # 1+7

d. (.210#1+7

%*2. he most commonly used transmission line is a

a. wo7wire balanced line

b. )ingle line

c. hree7wire line

d. Coa#

%*". he characteristic impedance of a transmission line does not depend upon its

a. >ength

b. Conductor diameter


112/124

c. Conductor spacing

d. hicness of armor

%*%. What is the impedance of a balance %7wire with a diameter of +.2(cm and spaced 2.( cm apart usingan insulator with a dielectric constant of 2.(?

a. 1++ ohms

b. ( ohms

c. 0( ohms

d. (+ ohms

%*(. It is required to match a 0"7ohm antenna to a ++ ohm polyethylene coa#ial feeder line with a'elocity factor of +. by means of a quarter wa'e matching a transformer. 8t a frequency of 1(+ 6,-

the impedance of the matching section is!!!! ohms.

a. 2+.2*

b. "1+.(

c. 1(+.2*

d. %(+.*2

%*. If the terminating impedance is e#actly equal to the characteristic impedance of the transmissionline the return loss is!!!!

a. Zero

b. Infinity

c. Bne

d.


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%**. he characteristic impedance of a transmission line is 0+ ohms and has a load of "( ohms. he)WR and reflection coefficient are !!!!! and !!!!! respecti'ely

a. 2 and +."""

b. 1 and +.

c. 2 and +.

d. 1 and +."""

%*. It is required to match a 2++ ohm load to a "++ ohm transmission line to reduce the )WR and attainresonance. 8 quarter wa'e transformer used directly connected to the load has a Zo of !!!! ohms.

a. 2%(

b. %2(

c. (2%

d. 2(%

%+. What quarter wa'e transformer will match a 1++ ohm7line to an antenna whose 'alue is 10( ohms?

a. 1(+ ohms

b. 1"0.( ohms

c. 1"2.2 ohms

d. 1.(* ohms

%1. he mismatch between antenna and transmission line impedance cannot be corrected by

a. Hsing an >C networ

b. 8dOusting antenna length

c. Hsing a balun

d. 8dOusting the length of the transmission line

%2. 8 pattern of 'oltage and current 'ariation along a transmission line not terminated in its characteristicimpedance is called

a. 8n electric field

b. Radio wa'es


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c. )tanding wa'es

d. 6agnetic field

%". he most desirable 'alue of )WR on a transmission line is

a. +

b. 1

c. 2

d. Infinity

%%. In transmission lines the most desirable reflection coefficient is

a. Zero

b. +.(

c. 1

d. Infinity

%(. 8t 'ery high frequencies transmission lines are used as !!!!!.

a. uned circuits

b. 8ntennas

c. Insulators

d. Resistors

%. What is the reflection coefficient of a 1++ ohm characteristic impedance line and a "++ ohm load?

a. +.2(

b. +."

c. +.(

d. +.0(

%0. he minimum 'oltage along a transmission line is 2+ 'olts while the ma#imum is "+ 'olts. he)WR is

a. +.0


115/124

b. 1.+

c. 1.2

d. 1.(

%*. 8 single conductor running from the transmitter to the antenna

a. R=7*@H

b. )ingle line wire

c. win7lead

d. 6icrostrip

%. What characteristic impedance is needed to match a (+7ohm line to a "++ ohm7load?

a. 221 ohms

b. 122 ohms

c. 212 ohms

d. 112 ohms

(++. Indicate the false statement. he )WR on a transmission line is infinityU the line is terminated in

a. )hort circuit

b. 8 comple# impedance

c. 8n open circuit

d. 8 pure reactance

45!. 2)45(. (D!

453. ,round454. !455. 7( o&%*456. 3!6457. !458. eecto%eter459. + *&ort#circuited *tub at *o%e*-eciBc di*tance ro% t&e load

460. &e $ire *ize i* *%all $it& re*-ectto t&e *-acin' o t&e conductor*

46!. )tandin' $ave46(. Fouble *tub463. o464. 2olta'e *tandin' $ave ratio465. A%-edance o t&e *ource and t&eload are %i*%atc&ed466. !.67467. )tandin' $ave ratio


116/124

468. e*i*tive load at t&e re*onantreuency469. @ne470. !.(D!47!. &e i%-edance in eual*i%-edance out

47(. Ha* t&e c&aracteri*tic* o -aralleltuned circuit473. An-ut and out-u

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Transmission Fundamentals 2