MOCK TEST EE-A

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MOCK TEST FIRST WWW.GATEHELP.COM

EE : ELECTRICAL ENGINEERING

Duration : Three Hours Maximum Marks : 100

Read the following instructions carefully.

1. Do not open the seal of the Question Booklet unlit you are asked to do so by the invigilator.

2. Take out the Optical Response Sheet (ORS) from this Question Booklet without breaking the sealand read the in-struments printed on the ORS carefully. If you find the Question Booklet Code printed at the right hand top cornerof this page does not match with the Booklet Code on the ORS, exchange the booklet immediately with a new sealedQuestion Booklet.

3. On the right half of the ORS, using ONLY a black ink ball point pen, (i) darken the bubble corresponding to your testpaper code and the appropriate bubble under each digit of your registration number and (ii) write your registrationnumber, your name and name of the examination center and put your signature at the specified location.

4. This Question Booklet contain 16 pages including blank pages for rough work. After you are permitted to open theseal, please check all pages and report discrepancies, if any, to the invigilator.

5. There are a total of 65 Question carrying 100 marks. All these questions are of objective type. Each question has onlyon correct answer. Question must be answered on the left hand side of the ORSby darkening the appropriate bubble(marked A, B, C, D) using ONLY a black ink ball point penagainst the question number. For each question darken thebubble of the correct answer. More than on answer bubbled against a question will be treated as an incorrect response.

6. Since bubbles darkened by the black ink ball point pen cannotbe erased, candidates should darken the bubbles in theORS very carefully.

7. Question Q. 1 Q. 25 carry 1 mark each. Questions Q. 26 - Q. 55 carry 2 marks each. The 2 marks question include twopairs of common data questions and two pairs of linked answer questions. The answer of the second question of thelinked answer questions depends on the answer to the first question of the pair. If the first question in the linked pairis wrongly answered or is unattemped, then the answer to the second question in the pair will not be evaluated.

8. Question Q. 56 - Q. 65 belong to General Aptitude (GA) section and carry a total of 15 marks. Question Q. 56 - Q.60carry 1 mark each, and questions Q. 61 -Q. 65 carry 2 marks each.

9. Unattempted questions will result in zero mark and wrong answer will result in NEGATIVE marks. For all 1 mark

questions /1 3 mark will be deducted for each wrong answer. For all 2 marks questions, /2 3 mark will be deducted foreach wrong answer. However, in the case of the linked answer question pair, there will be negative marks only for wronganswer to the first question and no negative marks for wrong answer to the second question.

10. Calculator is allowed whereas charts, graph sheets or tables are NOTallowed in the examination hall.

11. Rough work can be done on the question paper itself. Blank pages are provided at the end of the question paper forrough work.

12. Before the start of the examination, write your name and registration number in the space provided below using a

blank ink ball point pen.

Names

Registration Number EE

For Answer Key and Full Solution mail to [email protected].


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Q.1- Q.25 carry one mark each.

Q.1 Consider a LTI discrete time system shown in figure below

If input [ ]x nis a periodic sequence with period Nthen which of the following statement

regarding output [ ]y nin true ?

(A) [ ]y nis a aperiodic

(B) [ ]y nis periodic with periiod 'N N2=

(C) [ ]y nis periodic with period 'N N=

(D) [ ]y nis periodic with period 'N N2

=

Q.2 In the circuit shown below what is the value of current iin the figure ?

(A) 2 2j+^ hA (B) 2 2j^ hA

(C) j2 2 ^ hA (D) j2 2 +^ hA

Q.3 In synchronous motor minimum armature current corresponds to

(A) lagging power factor (B) leading power factor

(C) zero power factor (D) unity power factor

Q.4 A 3-phase, 10,000 kVA, 11 kV alternator has a subtransient reactance of 8%. A3-phase short-circuit occurs at its terminals. The fault MVA and fault current are

(A) 13.75 MVA, 7.21 kA (B) 125 MVA, 11.36 kA

(C) 125 MVA, 6.56 kA (D) 13.75 MVA, 6.56 kA

Q.5 A new Binary Coded Pentary (BCP) number system is proposed in which every digitof a base-5 number 24 will be represented by its BCP code 010100. In this numberingsystem, the BCP code 10001001101 corresponds of the following number is base-5system

(A) 423 (B) 1324

(C) 2201 (D) 4231

Q.6 Following table gives the set of 10 measurements that were recorded by a student


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EE-A WWW.GATEHELP.COM

working on an experiment in the laboratory.

Measurement number Measurement value Xn

1 98

2 1013 102

4 97

5 101

6 100

7 103

8 98

9 106

10 99

The precision of the 6th measurement is

(A) 0.01 (B) 0.1

(C) 0.995 (D) .0049

Q.7 Consider the given circuit and a waveform for the input voltage. Assume the diode isideal, the waveform of output voltage vois

Q.8 A three phase bridge inverter is fed from a 500 V dc source. The inverter is operatedin 180cconduction mode and it is supplying a purely resistive, star-connected load.The RMS value of the output (line) voltage is

(A) 450 V (B) 259.80 V

(C) 408 V (D) 235.56 V

Q.9 In pumped storage scheme, the generator is also used as


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(A) induction generator or synchronous condenser.

(B) induction generator or synchronous motor.

(C) synchronous generator or induction generator.

(D) synchronous motor or synchronous condenser.

Q.10 Trigonometric Fourier series for a periodic function shown in figure below is given as

( )f t cos sink a nt b nt 2 2n nn 1

= + +3

=

/

The constant ,k anand bnare

(A) , ,k a b n0 01

n n = = =

(B) , ,k a b21

0 0n n= = =

(C) , ,k an

bn2

1 1 1n n

= = = (D) , ,k a b

n21 0 1n n

= = =

Q.11 In the circuit shown in fig (a) if current 2.5I A1 = then current I2and I3in fig (b)and fig (c) respectively are

(A) 5 A, 10 A (B) 5 A, 10 A

(C) 5 A, 10 A (D) 5 A, 10 A

Q.12 Consider an ideal transformer shown below. Which of the following statement is true ?

(A) z-parameters exist for the network

(B) Both zand y-parameters exist for the network

(C) Neither znor y-parameters exist for the network

(D) y-parameters exist for the network


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Q.13 The starting torque of a 3 induction motor can be increased by increasing

(A) the rotor resistance (B) the rotor reactance

(C) the stator resistance (D) the stator reactance

Q.14 A PMMC instrument with a 100 turn coil has magnetic flux density in its air gaps of

0.2 TB= . The coil diameter is 1 cmD = and length is 1.5 cml = . For a current of 1mA, the torque on the coil will be

(A) 3 10 Nm6# (B) 106 Nm6#

(C) . 101 5 Nm6# (D) 1012 Nm6#

Q.15 The forward transfer function of a ufb system is ( )G s ( )( )

( )s s

K s

1 212

=+ +

+The system is

stable for

(A) K 1< (B) K 1>

(C) K 2< (D) K 2>

Q.16 The positive sequence bus impedance matrix of a 4-Bus power system network isgiven below :

Z ,BUS1

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

0 724

0 620

0 656

0 664

0 620

0 738

0 642

0 660

0 656

0 642

0 702

0 676

0 644

0 660

0 676

0 719

=

R

T

SSSSSS

V

X

WWWWWW

If a symmetrical fault occurs on Bus-2, then positive sequence component of fault

current is

(A) .j1 61 pu (B) .j0 375 pu

(C) .j1 51 pu (D) .j1 35 pu

Q.17 A 4 pole generator, having wave wound armature winding has 55 slots, each slotcontaining 19 conductors. What will be the voltage generated in the machine whendriven at 1500 rpmassuming the flux per pole is 3.0 mWb?

(A) 78.375 V (B) 940.5 V

(C) 156.75 V (D) 470.25 V

Q.18 The figures show two different sets of input and output variables for the same two-port resistive network N. Value of Iois

(A) 2 A (B) 1.25 A

(C) 2.4 A (D) 1 A


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Q.19 A 220 Vd.c. shunt motor runs at 500 . . .r p m when the armature current is 50 A. Thearmature resistance of the motor is 0.2 . If the torque is doubled, then speed of themotor will be

(A) 476 rpm (B) 479 rpm

(C) 454 rpm (D) remains same

Q.20 When a fault occurs in a high voltage transmission line, first the

(A) circuit breaker operates then the relay.

(B) relay operates then the circuit breaker.

(C) relay operates, then successively the isolator and the circuit breaker.

(D) isolator operates, then successively the relay and the circuit breaker.

Q.21 An ac voltmeter using half-wave rectifier circuit is used to measure a 10 V rms acvoltage as shown in the figure. The PMCC instrument has an internal resistance of

100 and full-scale deflection at 1 mA. What is the required value of series resistance?

(A) 450 k (B) 449.5 k

(C) 500 (D) 500 k

Q.22 The phenomena of crawling in a 3 cage rotor induction motor may be due to

(A) stator circuit 3rd harmonic (B) stator circuit 3rd space harmonic

(C) rotor circuit 3rd time harmonic (D) rotor circuit 3rd space harmonic

Q.23 A three-phase, 33 kV line feeds a per-phase load of 10 MW. If the impedance of theline is Z j20 = , then the value of load angle to maintain a line voltage of 33 kV atthe load is

(A) 60c (B) .10 58c

(C) 30c (D) .33 43c

Q.24 In a series generator the field resistance is 650 and the load resistance is 800 .

(A) The machine will not excite

(B) The machine will deliver a low voltage

(C) The machine will deliver a high voltage

(D) The machine will deliver a low voltage

Q.25 A three-phase motor draws 20 kVA at 0.707 power-factor lagging from a 220 V source.


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The correct statements are

(A) (P) and (R) (B) (Q) and (R)

(C) (P) and (S) (D) (Q) and (S)

Q.29 When two wattmeters W1and W2are used to measure power input to a synchronous

motor, each of them indicates 60 kW. If the power factor is to be changed to 0.866leading keeping the total input power same, then reading of W1andW2are respectively

(A) 90 kW, 30 kW (B) 30 kW, 90 kW

(C) 40 kW, 80 kW (D) 50 kW, 70 kW

Q.30 Consider the following circuit and input voltage to it.

If op-amp and diodes are ideal, the output voltage waveform is

Q.31 Consider a circuit shown in figure. The circuit functions as

(A) D-flip-flop (B) T-flip-flop

(C) Output remains stable at ' '1 (D) Output remains stable at ' '0


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Q.32 The circuit shown in the figure is initially relaxed. If the thyristor is turn on at t 0=, what is the conduction time of thyristor ?

(A) LC2 (B) LC

(C) LC4 (D) LC

2

Q.33 For a 50 MVA, 11 kV, three-phase synchronous generator, it is given that three-phase fault current is 2000 A and line to line fault current is 2600 A. The generator

neutral is solidly grounded. The per unit value of negative sequence reactance of thegenerator is

(A) 0.436 pu (B) 1.056 pu

(C) 1.71 pu (D) 0.524 pu

Q.34 A DT system has following input-output relationship [ ]y n[ ],

,

x n x

x

3

0

0

0

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