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Question 1 of 17
1. Question
A threephase, 50 Hz salientpole synchronous motor has a perphase directaxis reactance (Xd) of 0.8 pu and a perphase quadratureaxis reactance (Xq) of 0.6 pu. Resistance of the machine is negligible. It is drawing fullload current at 0.8 pf (leading). When the terminal voltage is 1 pu, perphase induced voltage, in pu, is
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Question 2 of 17
2. Question
A singlephase, 22 kVA, 2200 V/ 220 V, 50 Hz, distribution transformer is to be connected as an autotransformer to get an output voltage of 2420 V. Its maximum kVA rating as an autotransformer is
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Question 3 of 17
3. Question
A singlephase fullbridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120o duration is used to trigger the appropriate devices in each halfcycle. The rms value of the fundamental component of the output voltage, in volts, is
Correct
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Question 4 of 17
4. Question
A singlephase transmission line has two conductors each of 10 mm radius. These are fixed at a centertocenter distance of 1 m in a horizontal plane. This is now converted to a threephase transmission line by introducing a third conductor of the same radius. This conductor is fixed at an equal distance D from the two singlephase conductors. The threephase line is fully transposed. The positive sequence inductance per phase of the threephase system is to be 5% more than that of the inductance per conductor of the singlephase system. The distance D, in meters, is
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Question 5 of 17
5. Question
A dc voltage with ripple is given by v(t) = [100 + 10 sin(wt) − 5 sin (3wt)] volts. Measurements of this voltage v(t), made by movingcoil and movingiron voltmeters, show readings of V1 and V2 respectively. The value of V2 − V1, in volts, is
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Question 6 of 17
6. Question
If a continuous function f(x) does not have a root in the interval [a,b] then which one of the following statements is true?
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Question 7 of 17
7. Question
If the sum of diagonal elements of a 2*2 matrix is 6 then the maximum possible values of determinant of matrix is
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Question 8 of 17
8. Question
A (050A) moving coil ammeter has a voltage drop of .1V across its terminals at full scale deflection.The external shunt resistance needed to extend its range to (0500A) is
Correct
Incorrect

Question 9 of 17
9. Question
Of the four characteristics given below which are the major requirements for an instrumentation amplifier?
P.High common mode rejection ratio
Q.High input impedance
R.high linearity
S.High output impedanceCorrect
Incorrect

Question 10 of 17
10. Question
Base load power plants are
P. Wind farms
Q.Run of river plants
R.nuclear power plants
S.diesel power plantsCorrect
Incorrect

Question 11 of 17
11. Question
The self inductance of the primary winding of a single phase 50Hz transformer is 800mH and that of the secondary winding is 600mH.The mutual inductance between these two winding is 480mH.The secondary winding of this transformer is short circuited and the primary winding is connected to a 50Hz single phase sinusoidal voltage source.The current flowing in both the windings is less than their respective rated current.The resistance of both windings can be neglected.What is the effective inductance (in mH) seen by the source?
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Question 12 of 17
12. Question
The primary mmf is least affected by the secondary terminal conditions in a
Correct
Incorrect

Question 13 of 17
13. Question
The signum function is given by sgn(x) = x/x for x not equal to 0 and 0 for x = 0. The fourier series expansion of sgn(cos(t)) has
Correct
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Question 14 of 17
14. Question
Two players A and B alternatively keep rolling a fair dice.The person to get a six first wins the game.Given that player A starts the game the probability that A wins the game is
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Question 15 of 17
15. Question
A 3phase 50Hz square wave (6step) VSI feeds a 3phase 4 pole induction motor.The VSI line voltage has a dominant 5th harmonic component.If the operating slip of the motor with respect to fundamental component voltage is .04 the slip of the motor with respect to 5th harmonic component of voltage is
Correct
Incorrect

Question 16 of 17
16. Question
A 8 bit unipolar successive approximation register type ADC is used to convert 3.5V to digital equivalent output.The reference voltage is +5V.The output of the ADC at the end of third clock pulse after the start of the conversion is
Correct
Incorrect

Question 17 of 17
17. Question
Assertion: Fast decoupled load flow method gives approximation load flow solution because it uses several assumptions.
Reason: Accuracy depends on the power mismatch vector tolerance.Correct
Incorrect