(Www.entrance-exam.net)-Wipro Placement Paper 2008

8/11/2019 (Www.entrance-exam.net)-Wipro Placement Paper 2008

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1. In the case of a 70 MHz 1F carries for a transponder band width of 36 MHz; energymst !ie between " MHz.

a.# 3$ and 106

b.# %&. 'nd ((c.# 106 and 1$&

d.# 3$ and 1$&

&. )adar sed to e!iminate c!tter in na*igationa! app!ication is "

a.# +!se radar

b.# ,rac-ing radar

c.# M,I radard.# Mono p!se radar

3. ,he 1.%% mm windows is not yet in se with fiber optic systems becase "

a.# ,he attenation is higher than at 0.(% mmb# ,he attenation is higher than at 1.3mm

c.# itab!e !aser de*ices ha*e not yet been de*e!opedd.# It does not !end itse!f to wa*e!ength m!tip!e/ing

$. +reemphasis in FM systems in*o!*esa.# ompression of the mod!ating signa!

b.# 2/pansion of the mod!ating signa!

c.# 'mp!ification of !ower freency components of the mod!ating signa!.

d.# 'mp!ification of higher freency components of the mod!ating signa!.

%. In a terrestria! microwa*e system transmission of signa!s is achie*ed throgha.# ref!ection from the ionosphereb.# !ine of sight mode

c# ref!ection from the grond

d.# diffraction from the stratosphere.

6. asse grain feed is sed with a parabo!ic ref!ector to

a.# increase the gain of the system

b#. increase the bandwidth of the systemc.# redce the size of the main ref!ector

d.# a!!ow the feed to be p!aced at a con*enient point.

7. In most microwa*e commnication !in- rain drop attenation is cased de to

a.# scattering of microwa*es by water drops of specific size.

b# scattering of microwa*es by a co!!ection of drop!ets acing as a sing!e body.c.# absorption of microwa*es by water and conseent heating of the !iid

d.# absorption of the microwa*es by water *apor in the atmosphere.


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(. 4hen a 57% " $0#4 !oad is connected to a coa/ia! !ine of 0 8 7% 4 at 6MHz then the

!oad matching on the !ine can be accomp!ished by connecting

a.# ' short " circited stb at the !oadb.#'n indctance at the !oad

c. #' short circited stb at a specific distance from the !oad

d.#none of the abo*e's compared to ana!og m!timeters9 digita! m!timeters are "

a.# !ess accrate

b.# more accratec.# ea!!y accrate

d.# none.

:. 4hen a signa! of 10 m at 7% MHz is to be measred then which of the fo!!owinginstrments can be sed "

a.# ,M

b.# athode ray osci!!oscope

c.# Mo*ing iron *o!tmeterd.#


3/7

1$. ,he @ of a radio coi! "

a.# is independent of freencyb.# increases monotonica!!y as freency increases

c.# decreases monotonica!!y as freency increases

d.# increases pto a certain freency and then decreases beyond that freency

1%. 4hen a generator of interna! impedance and operating at 1AHz feeds a !oad *ia a

coa/ia! !ine of characteristic impedance %0 ohm then the *o!tage wa*e ratio on the feed!ine is "

a.# 0.%

b.# 1.%

c.# &.%d.# 1.7%

16. ,he coding system typica!!y sed in digita! te!emetry is "

a.# ++M 5p!se position mod!ation#b.# +'M 5p!se amp!itde mod!ation#

c.# +M 5p!se code mod!ation#d.# +


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$ . 5t# $e&t $5t#

&1. 4hich is the fo!!owing re!ate to rationa! transfer fnction of a system

1. )atio of Forier transform of otpt to inpt with zero initia! conditions.

&. )atio of Eap!ace transform of otpt to inpt with zero initia! conditions.3. Eap!ace transform of system imp!se response.

&&. Eap!ace transform of system nit step response se!ect the correct answer sing the

codes gi*en be!ow. odes

a.# 1 and $

b.# & and 3c.# 1 and 3

d.# & and $

&3.For the signa! g 5t# " 10 cos 5%0 pt# cos& 51%0at# ,he Cyist samp!ing state in tseconds is

a.# 1%0 samp!es per second

b.# &00 samp!es per second

c.# 300 samp!es per secondd.# 3%0 samp!es per second

&$. In the case of a 70 MHz 1F carries for a transponder band width of 36 MHz; energymst !ie between " MHz.

a.# 3$ and 106

b.# %&. 'nd ((c.# 106 and 1$&

d.# 3$ and 1$&

&%.)adar sed to e!iminate c!tter in na*igationa! app!ication is "

a.# +!se radar

b.# ,rac-ing radarc.# M,I radar

d.# Mono p!se radar

&6.,he 1.%% mm windows is not yet in se with fiber optic systems becase "

a.# ,he attenation is higher than at 0.(% mmb# ,he attenation is higher than at 1.3mm

c.# itab!e !aser de*ices ha*e not yet been de*e!oped

d.# It does not !end itse!f to wa*e!ength m!tip!e/ing


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&7.+reemphasis in FM systems in*o!*es

a.# ompression of the mod!ating signa!b.# 2/pansion of the mod!ating signa!

c.# 'mp!ification of !ower freency components of the mod!ating signa!.

d.# 'mp!ification of higher freency components of the mod!ating signa!.

&(.In a terrestria! microwa*e system transmission of signa!s is achie*ed throgha.# ref!ection from the ionosphere

b.# !ine of sight mode

c# ref!ection from the grond

d.# diffraction from the stratosphere.

&:.asse grain feed is sed with a parabo!ic ref!ector to

a.# increase the gain of the system

b#. increase the bandwidth of the systemc.# redce the size of the main ref!ector

d.# a!!ow the feed to be p!aced at a con*enient point.

30.In most microwa*e commnication !in- rain drop attenation is cased de to

a.# scattering of microwa*es by water drops of specific size.b# scattering of microwa*es by a co!!ection of drop!ets acing as a sing!e body.

c.# absorption of microwa*es by water and conseent heating of the !iid

d.# absorption of the microwa*es by water *apor in the atmosphere.

31.4hen a 57% " $0#4 !oad is connected to a coa/ia! !ine of 0 8 7% 4 at 6MHz then

the !oad matching on the !ine can be accomp!ished by connectinga.# ' short " circited stb at the !oad

b.#'n indctance at the !oad

c. #' short circited stb at a specific distance from the !oadd.#none of the abo*e

3&.'s compared to ana!og m!timeters9 digita! M!timetersBs are "

a.# !ess accrateb.# more accrate

c.# ea!!y accrate

d.# none.

33.4hen a signa! of 10 m at 7% MHz is to be measred then which of the fo!!owing

instrments can be sed "a.# ,M

b.# athode ray osci!!oscope

c.# Mo*ing iron *o!tmeter

d.#


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3$.'mp!ifier of c!ass = has high theoretica! efficiency of 7(.% percent becase

a.# It is biased a!most to satrationb.#Its iescent crrent is !ow

c.#It>s otpt is an e/act rep!ica of it>s inpt

d.#It is biased we!! be!ow ct off

3%.,he cop!ing that prodces minimm interference with freency response isa.#


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$0# )ona!d and 2!an are wor-ing on an assignment. )ona!d ta-es 6 hors to type 3&

pages on a compter9 whi!e 2!an ta-es %

hors to type $0 pages. How mch time wi!! they ta-e9 wor-ing together on two differentcompters to type an assignment

of 110 pages G

'# 7 hors 30 mintes

=# ( hors

# ( hors 1% mintes

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(Www.entrance-exam.net)-Wipro Placement Paper 2008