This practice GATE test includes only those questions which are part of the GATE electrical question papers. Solve timed GATE practice papers to improve your speed and accuracy in GATE 2012 exam.

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The 8085 assembly language instruction that stores the content of H and L registers into the memory locations 2050H and 2051H, respectively, is…..

SHLD 2050H

SPHL 2050H

STAX 2050H

SPHL2051H

A110 kV, single core coaxial, XLPE insulated power cable delivering power at 50Hz, has a capacitance of 125 nF/km. If the dielectric loss tangent of XLPE is 2×10-4, the dielectric power loss in this cable in W/km is…..

189.0

87.5

72.3

56.0

The armature resistance of a permanent magnet dc motor is 0.8 W. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be….

88.0%

58.0%

61 %

48.0%

The open loop transfer function of a unity feed back control system is given as G(s) =

The value of â€˜aâ€™ to give a phase margin of 45Â° is equal to …..

1.141

0.441

0.841

0.141

A 50 kW dc shunt motor is loaded to draw rated armature current at any given speed. When driven (i) at half the rated speed by armature voltage control and (ii) at 1.5 times the rated speed by field control, the respective output powers delivered by the motor are approximately.

50kW in (i) and 75kW in (ii)

25kW in (i) and 75kW in (ii)

50kW in (i) and 50kW in (ii)

25kW in (i) and 50kW in (ii)

A single-phase half-controlled rectifier is driving a separately excited dc motor. The dc motor has a back emf constant of 0.5 V/rpm. The armature current is 5 A without any ripple. The armature resistance is 2W. The converter is working from a 280 V, single phase ac source with a firing angle of 80Â°. Under this operating condition, the speed of the motor will be…..

359 rpm

381 rpm

366 rpm

350 rpm

The unit impulse response of a second order under-damped system starting from rest is given by c(t) = 12.5 e-6t sin 8 t, t 0 The steady-state value of the unit step response of the system is equal to….....

0.75

0.28

1.0

0.35

The simultaneous application of signals x(t) and y(t) to the horizontal and vertical plates, respectively, of an oscilloscope, produces a vertical figure-of-8 display. If P and Q are constants, and x(t) = P sin (4t + 30), then y(t) is equal to…

Q sin (4t – 30)

Q sin (8t + 60)

Q sin (4t + 30)

Q sin (2t + 15)

The solution of the first order differential equation x(t) = -3x(t), x (0) = x0 is

x (t) = x0 e-3

x (t) = x0 e-3t

x (t) = x0 e-1/3

x (t) = x0 e-1

A single-phase, 230 V, 50 Hz, 4 pole, capacitor-start induction motor has the following stand-still impedances Main winding Zm = 6.0 + j4.0 W Auxiliary winding Za = 8.0 + j6.0 W The value of the starting capacitor required to produce 90Â° phase difference between the currents in the main and auxiliary windings will be….

211.10 mF

186.52mF

176.84 mF

125.20mF

A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the number of poles required in the generator are…

8

16

24

12

The Nyquist plot of loop transfer function G(s) H(s) of a closed loop control system passes through the point (-1, j0) in the G(s) H(s) plane. The phase margin of the system is…....

180Â°

45Â°

60Â°

90Â°

A 50 Hz, 4-pole, 500 MVA, 22 kV turbo-generator is delivering rated megavolt-amperes at 0.8 power factor. Suddenly a fault occurs reducing is electric power output by 40%. Neglect losses and assume constant power input to the shaft. The accelerating torque in the generator in MNm at the time of the fault will be…...

0.528

0.789

0.678

1.528

The following motor definitely has a permanent magnet rotor…..

Reluctance motor

DC commutator motor

Brushless dc motor

Stepper motor

The RMS value of the voltage u(t) =3 + 4cos (3t) is…..

7 v

5 v

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