mock gate eee

8/3/2019 Mock Gate EEE

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Mock GATE Exam

Note:

a) Q.1 to Q.25 carry 1-mark each, and Q.26 to Q.55 carry 2-mark each

b) Q 48 to Q.51 (2 pairs) are common data questions and question pairs (Q.52 & Q.53) and (Q.54 &

Q.55) are linked answer questions.

Section 1 (Q.1 to Q.25)

1. A wave form shown in figure below. Is fed to D.C ammeter. What is the reading shown by the

meter?

2. According to the Maximum power transfer theorem, what is the maximum power absorbed by

one network from another network?

3. The Nyquist plot of a system passes through (-1,j0) point in the G(jw)H(jw) plane, the phase

margin of the system is:

4. For the circuit shown below, the block box consists of resistors and independent sources only.

The current I is 3 A and 1.5 A for R=0 and R=2, respectively. For R=1, what is the current

I?

Department of EEE, VLITS, Vadlamudi Page 1

a) Zero

b) 50 m-A

c) 75 m-A

a) The impedance of one network is half that of the other

network

b) The impedance of one network is complex conjugate of the

other

a) Infinite c) Zero


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Mock GATE Exam

5. In the network shown below, it is given that v=1volts and at a time t, where t is the

time after the switch S is closed. What is the value of C?

6. In a two element series network, the voltage and current respectively are given as, V(t)=50

sin(314t) + 50 sin(942t) Volts and i(t) = 10 sin(314t+600) + 8 sin(942t+450) Amps, then the

power factor of the network is approximately:

7. The successive approximation A/D output for a 4-bit converter to a 8.217 Volt input (if the

reference is 5 V) will be:

8. What is the load at which maximum efficiency occurs in case of a100 kVA transformer with iron

loss of 1kw and full-load copper loss of 2kw?

9. Two generating stations connected to load center having capacity of 50 MVA and 75 MVA

deliver 100 MW to the load. The incremental cost of plant 1 is 15+0.15P1 and that of the plant 2 is

18 + 0.15P2. What are the values of P1 and P2, respectively?

10. For the circuit shown in Fig. A, the V-I (Voltage-current) characteristics of the circuit using ideal

components is given by curve a in Fig.B. Which curve in Fig.B represents the V-I characteristics

for the circuit shown in Fig.C?


a) 1 A c) 2A

b) 3A d) 4A

a)0.05 F c)

0.15 F

a) 0.9 b) 0.3 c) 0.1

a) 1101 b)0110 c) 1010

a) 100 KVA b) 70.7 KVA c) 50.5 KVA d)25.2KVA

a) 60MW & 40 MW b) 50MW each c) 72MW & 28 MW d) 30MW


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Mock GATE Exam

11. In 8085 microprocessor Carry flag is not affected by the following instruction

12.In the given circuit, the output y equals which one of the following?

13. What is the operating slip of a 400V,50 Hz, 6 pole, 3-phase induction motor, while the speed is

936 r.p.m. with a 400 V, 45Hz, 3-phase supply?

14. Mho relay is usually employed for the protection of

15.X is a uniformly distributed random variable that takes values between 0 and 1. The value of E

is

16. In the circuit given above, if the output is taken from point E instead of node C, what will be the

result?


a) Curve a

b) Curve b

c) Curve c

a) ADD B b) SBB B c) INR B d) ORA B

a) A+B

b) B +A

c AB

a) 0.036 b)0.064 c) 0.025 d) 0.075

a) Short lines only b) Medium Lines only c) Long Lines

a) 0 b) c) d) 1/8


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Mock GATE Exam

17. What is represented by the digital circuit given by

18. A resistor connected across the gate and cathode of an SCR

19. How many relays are used to detect inter phase fault of a three line system?

20. What is the purpose of impedance matching between the output of previous stage and input of the

next stage in cascaded amplifiers

21. If the inertia constant H=8MJ/MVA for a 50MVA generator, the stored energy is:

22. The circuit shown in figure below is:


a) An increase in the output impedance

b) A reduction in the output impedance

a) An SR flip-flop with A=S and B=R

b) A JK flip-flop with A=K and B=J

c A JK fli -flo with A=J and B=K

a) Increases rating of SCR

b) Increases holding current of SCR

c Decreases noise immunit of SCR

a) One b) Two c) Three d) Six

a) To achieve high efficiency c) To achieve reduced distortion

a) 50M b) 8M c) 400M d) 6.25M

a) A low pass filter

b) A high pass filter

c) A comparator


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Mock GATE Exam

23.In a 3-phase semi converter, for firing angle less than or equal to 600, freewheeling diode

conducts for:

24. A turbine-generator set has a regulation constant of 6% on the generator rating of 120MVA,

50Hz. The generator frequency decreases by 0.01 Hz. The increase in turbine output for steady-

state operation is:

25.Which three-phase connection can be used in transformer to introduce a phase difference of 300

between its output and corresponding input line voltages?

26. For a lossy transmission line, the characteristic impedance does not depend on

27.The transfer function of a linear control system given by in its bode diagram,

the value of gain for =0.1 rad/sec is

28. Consider the following statements with regards to signal flow graph given below:


a) 90

0

b) 60

0

c) 30

0

d) 0

0

a) 0.8MW b) 0.4MW c) 0.2MW d)

a) Star-Star b) Star-delta c)Delta-delta d) Delta-

a) The operating frequency of the line

b) The conductivity of the conductors

c Conductivit of the dielectric se aratin the conductors

a) 20db b)0 db c) 60db d) 80db


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Mock GATE Exam

29.For a line of characteristic impedance Z0 terminated in a load of ZR such that ZR=Z0/3, what is the

reflection coefficient?

30. Which one of the following statements is not true for a P-type semiconductor?

31. A particular control system yielded a steady-state error of 0.2 for unit step input. A unit integrator

is cascaded to this system and unit ramp input is applied to this modified system. What is the

value of steady state error for this modified system?

32. At t=0 the switch K is thrown from b to a of the circuit as shown below. What are the values of

v (0+) and i(0+)?


1) The number of loops are 3

2) The number of forward paths

are 3

Which of these statements are

correct?

a) 1, 2 and 4 c)1,3 and 4

a) 1/3 b)-1/3 c)2/3 d)-12

a) Conduction is by the movement of holes in the valence band

b) Holes constitute the majority charge carriers

c) Fermi level lies closer to the conduction band between the conduction and valence

a) 0.1 b) 0.15 c) 0.2 d) 0.25

a) 50 and 90mA

b) 50 V and 100mA

c) 50 V and 110mA


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Mock GATE Exam

33.In a series R-L-C circuit, the maximum voltage across the capacitor occurs at a frequency

34.One cycle of a square wave signal observed on an oscilloscope is found to occupy 6 cm at a scale

setting of 30 s/cm. what is the signal frequency?

35. What is the approximate value of the gain margin in the Nyquist diagram given below?

36.The function f(x)=2x-x2+3 has

37.A zero mean a random signal is uniformly distributed between limits a and + a and its mean

square value is equal to its variance. Then the r.m.s value of the signal is

38.The two vectors [1,1,1] and [1,a,a2], where a=[-0.5+j0.707], are

39. The second harmonic component of the periodic waveform given in the figure has an amplitude

of


a) Double at the resonant frequency

b) Equal to resonant frequency

a) 1.8 kHz b) 5.55KHz c) 18KHz d)

a) 0.67

b) 3.0

c) 1.0

a) A maxima at x=1 and a minima at x=5 c) a maxima at x=1and a minima at x = -5

a) b) c) a d) a

a) Orthogonal b) orthonormal c) parallel d) collinear

a) 0

b) 1

c) 2/


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Mock GATE Exam

40.The power electronic converter shown in the figure has a single pole double

throw switch. The pole P of the switch is connected alternately to throws A

and B. the converter shown is a

41.Consider a three core, three phases, 50Hz 11 Kv cable whose conductors are

denoted as R, Y and B in the figure. The inter phase capacitance (C1)

between each pair of conductors is 0.2 F and the capacitance between each

line conductor and the sheath is 0.4F. the per phase charging current is

42.A field excitation of 20 A in a certain alternator results in an armature current

of 400A in short circuit and a terminal voltage of 2000 V on open circuit. The

magnitude of the internal voltage drop within the machine at a load of 200 A

is

43.Out of the following plant categories

(i) Nuclear (ii) Run-of-river (iii) Pump Storage (iV) Diesel

The base load power plants are


a) Step-down chopper

b) Step up chopper

c) Half wave rectifier

a) 2A

b) 2.4A

c) 2.7A

a) 1V b) 10V c) 100V d) 1000V

a) i & ii b) ii & iii c) i,iii & iii d) i, iii & iv


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Mock GATE Exam

44.An SCR is considered to be a semi-controlled device because

45.The trace and determinant of a 2 X 2 matrix are known to be -2 and -35

respectively. Its Eigen values are

46.A three phase fully controlled bridge converter feeding a load drawing a

constant and ripple free load current of 10 A at a firing angle of 300. The

approximate Total Harmonic Distortion (%THD) and the RMS value of

fundamental component of the input current will respectively be

47.A 220 V, 1440 rpm, 40 A separately exited DC motor has an armature

resistance of 0.4. The motor is fed from a single phase circulating current

dual converter with an input AC line voltage of 220V (rms). The approximate

firing angles of the dual converter for motoring operation a\at 50% of rated

torque and 1000 rpm will be

Statement for linked question

48.For the circuit given above, the Thevinins resistance across the terminals A

and B is


a) It can be turned OFF but not ON with a Gate pulse

b) It conducts only during one half-cycle of an alternating current wave

c) It can be turned ON but not OFF with gate pulse

a) -30 & -5 b) -37 & 1 c) -7 & 5 d) 17.5 & -2

a) 31% & 6.8A b) 31% & 7.8 A c) 66% and 6.8 A d)

a) 430,1370 b)430,470 c)390,1410 d)390,510


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Mock GATE Exam

49.For the circuit above, the Thevinins voltage across the terminals A and B is

The input voltage given to a converter is Vi=100 2 sin(100 t) Volt. The current drawn by the

converter is ii=(10 2sin(100 t- +5 2 sin(300 ) +2 2 sin (500 ) A

50. The input power factor of the converter is

a) 0.31 b) 0.44 c) 0.5 d) 0.71

51. The active power drawn by the converter is

a) 181 W b) 500W c) 707W d) 887W

A 1:1 pulse Transformer (PT) is used to trigger the SCR in the adjacent figure. The SCR is rated

at 1.5KV, 250A with IL=250mA, IH=150mA, and IGmax=150mA, IGmin=100mA. The SCR is

connected to an inductive load, where L=150mh in series with a small resistance and the supply

voltage is 220 v Dc. The forward drops of all transistors/diodes and gate-cathode junction during

ON state is 1.0V.


a) 0.5K b) 0.2K c) 1K d)

a) 1.25V b) 0.25V c) 1V d) 0.5V

52. The resistance R should be

a) 4.7K

b) b) 470

53. The minimum approximate volt-second rating

of the pulse transformer suitable for triggering the

SCR should be: (volt-second rating is the maximum

of product of the voltage and the width of the pulse

that may be applied)

a) 2000 V-s b) 200 V-s c) 20 V-s d) 2.0V-s


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Mock GATE Exam

Caley-Hamilton Theorem states that a square matrix satisfies its own characteristic equation,

consider a matrix A =

54. A satisfies the relation

55. A9 equals

GENERAL APPLITUDE QUESTIONS

Q.56-Q.60 EACH CARRY ONE MARK

Q.56 choose the most appropriate words from the options given below to complete the following

sentence

Under ethical guidelines recently adopted by Indian Medical Association, human geans are

to be manipulated only to correct diseases for which ......................... treatments are

unsatisfactory.

(A) Satisfactory (B) Most (C) Uncommon (D) Available

Q.57 The question below consists of a pair of related words followed by pair of four words.

Select the pair that best expresses the relation in the original pair

Gladiator: Arena

(A) Dancer: stage (B) Commuter: train (C) Teacher: classroom (D) Lawyer: courtroom

Q.58 There are 2 candidates P, Q in a election. During the campaign 40% of voters promised to

vote for P, and rest for Q. However on the day of election 15% of voters went back on their

promises to vote for P instead of Q, 25% of voters went back on their promises to vote for Q

instead of P. Suppose P lost by 2 votes, what are the total number of voters?

(A) 100 (B) 110 (C) 90 (D) 95

Q.59 Choose the most appropriate word from the options given below to complete the following

sentence

It was her that the country problems had been.....................by foreign technocrats, so that

to invite them back would be the counter-productive

(A) Identified (B) Ascertained (C) Exacerbated (D) Analysed


a) A+3I+2A-1 =0 b)A2+2A+2I =0 c) (A+I)(A+2I)=0

a) 511A+510I b) 309A+104I c) 154A+ 155I d)


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Mock GATE Exam

Q.60 Choose the most appropriate word opposite in meaning from the options given below to the

given word

Frequency

(A) Periodicity (B) Rarity (C) Gradualness (D) Persistency

Q.61-Q.65 EACH CARRY TWO MARKS

Q.61 the sum of n term of the series 4+44+444+4444+.................is

(A) (4/81) (10n+1 -9n-1) (B) (4/81) (10n-1 -9n-1)

(C) (4/81) (10n+1 -9n-10) (D) (4/81) (10n -9n-10)

Q.62 The horse had played a little known but very important role in the medicine. Horses areinjected with toxins of the diseases until their blood build up with immunities. Then a serum was

made from their blood. Serum to fight with diphtheria and tetanus were developed as this way

It can be inferred from passage that horses were

(A) Given immunity to diseases (B) Generally quite immune to diseases

(C) Given medicines to fight toxins (D) Given diphtheria and tetanus serums

Q.63 The fuel consumed by a motorcycle during a journey while travelling at various speeds is

indicated in a graph given below

The distances covered during 4 laps of journey are listed in the table given below



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mock gate eee

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