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- Question 1 of 17
##### 1. Question

The locked rotor current in a 3-phase, star connected 15 kW, 4-pole, 230 V, 50 Hz induction motor at rated conditions is 50 A. Neglecting losses and magnetizing current, the approximate locked rotor line current drawn when the motor is connected to a 236 V, 57 Hz supply is

CorrectIncorrect - Question 2 of 17
##### 2. Question

A single phase 10 kVA, 50 Hz transformer with 1 kV primary winding draws 0.5 A and 55 W, at rated voltage and frequency, on no load. A second transformer has a core with all its linear dimensions sqaure root of 2 times the corresponding dimensions of the first transformer. The core material and lamination thickness are the same in both transformers. The primary windings of both the transformers have the same number of turns. If a rated voltage of 2 kV at 50 Hz is applied to the primary of the second transformer, then the no load current and power, respectively, are

CorrectIncorrect - Question 3 of 17
##### 3. Question

The transfer function of a compensator is given as

Gc(s) = (s+a)/(s+b)

Gc(s) is a lead compensator if

CorrectIncorrect - Question 4 of 17
##### 4. Question

The transfer function of a compensator is given as

Gc(s) = (s+a)/(s+b)

The phase of the above lead compensator is maximum at

CorrectIncorrect - Question 5 of 17
##### 5. Question

Given a system of equations:

x+2y+2z = b1

5x+y+3z = b2

Which of the following is true regarding its solutionsCorrectIncorrect - Question 6 of 17
##### 6. Question

Let f(x) = x/(e to the power x). The maximum value of the function in the interval (0, ∞) is

CorrectIncorrect - Question 7 of 17
##### 7. Question

Let X(s) = [(3s+5)/(s*s+10s+21)] be the Laplace transform of a signal x(t) then x(0+) is

CorrectIncorrect - Question 8 of 17
##### 8. Question

Let S be the set of points in the complex plane corresponding to the unit circle. (That is,S = {z:|z| =1}). Consider the function f(z)=zz* where z* denotes the complex conjugate of z. The f(z) maps S to which one of the following in the complex plane

CorrectIncorrect - Question 9 of 17
##### 9. Question

x(t) is nonzero only for Tx

CorrectIncorrect - Question 10 of 17
##### 10. Question

For a periodic square wave, which one of the following statements is TRUE?

CorrectIncorrect - Question 11 of 17
##### 11. Question

An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 700 rpm. The frequency of the rotor current of the motor in Hz is

CorrectIncorrect - Question 12 of 17
##### 12. Question

For a specified input voltage and frequency, if the equivalent radius of the core of a transformer is reduced by half, the factor by which the number of turns in the primary should change to maintain the same no load current is

CorrectIncorrect - Question 13 of 17
##### 13. Question

A star connected 400 V, 50 Hz, 4 pole synchronous machine gave the following open circuit and short circuit test results:

Open circuit test: Voc = 400 V (rms, line-to-line) at field current, If = 2.3 A

Short circuit test: Isc = 10 A (rms, phase) at field current,

If = 1.5 A The value of per phase synchronous impedance in Ω at rated voltage isCorrectIncorrect - Question 14 of 17
##### 14. Question

The undesirable property of an electrical insulating material is

CorrectIncorrect - Question 15 of 17
##### 15. Question

In the formation of Routh-Hurwitz array for a polynomial, all the elements of a row have zero values. This premature termination of the array indicates the presence of

CorrectIncorrect - Question 16 of 17
##### 16. Question

Power consumed by a balanced 3-phase, 3-wire load is measured by the two wattmeter method. The first wattmeter reads twice that of the second. Then the load impedance angle in radians is (where pi is contant 3.14)

CorrectIncorrect - Question 17 of 17
##### 17. Question

In an oscilloscope screen, linear sweep is applied at the

CorrectIncorrect