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

A soft-iron toroid is concentric with a long straight conductor carrying a direct current I. If the relative permeability μr of soft-iron is 100, the ratio of the magnetic flux densities at two adjacent points located just inside and just outside the toroid, is

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

In a constant V/f induction motor drive, the slip at the maximum torque

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

In a 100 bus power system, there are 10 generators. In a particular iteration of Newton Raphson load flow technique (in polar coordinates), two of the PV buses are converted to PQ type. In this iteration

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

The magnitude of three-phase fault currents at buses A and B of a power system are 10 pu and 8 pu respectively. Neglect all resistances in the system and consider the pre-fault system to be unloaded.The pre-fault voltage at all buses in the system is 1.0 pu. The voltage magnitude at bus B during a three-phase fault at bus A is 0.8 pu. The voltage magnitude at bus A during a three-phase fault at bus B, in pu, is

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

Consider a system consisting of a synchronous generator working at a lagging power factor, a synchronous motor working at an overexcited condition and a directly grid-connected induction generator. Consider capacitive VAr to be a source and inductive VAr to be a sink of reactive power. Which one of the following statements is TRUE?

CorrectIncorrect - Question 6 of 17
##### 6. Question

Candidates were asked to come to an interview with 3 pens each. Black, blue, green and red were the permitted pen colours that the candidate could bring. The probability that a candidate comes with all 3 pens having the same colour is

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

Let the eigenvalues of a 2 x 2 matrix A be 1, -2 with eigenvectors x1 and x2 respectively. Then the eigenvalues and eigenvectors of the matrix A2 − 3A + 4l would, respectively, be (A2 is square of A)

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

Let A be a 4 × 3 real matrix with rank 2. Which one of the following statement is TRUE?

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

Loop transfer function of a feedback system is G(s)H(s) = [(s+3)/s*s(s-3)].Take the Nyquist contour in the clockwise direction.Then the Nyquist plot of G(s)H(s) encircles -1 +j0

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

Given the following polynomial equation s3+5.5 s2+ 8.5 s + 3 = 0 the number of roots of the polynomial which have real parts strictly less than -1 is (where number after s denotes power like s2 is square of s)

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

The output of a continuous-time, linear time-invariant system is denoted by T{x(t)} where x(t) is the input signal. A signal z(t) is called eigen-signal of the system T , when T{z(t)} = a y(t), where a is a complex number, in general, and is called an eigenvalue of T. Suppose the impulse response of the system T is real and even. Which of the following statements is TRUE?

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

Two electric charges q and −2q are placed at (0,0) and (6,0) on the x-y plane. The equation of the zero equipotential curve in the x-y plane is

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

A three-phase cable is supplying 800 kW and 600 kVAr to an inductive load. It is intended to supply an additional resistive load of 100 kW through the same cable without increasing the heat dissipation in the cable, by providing a three-phase bank of capacitors connected in star across the load. Given the line voltage is 3.3 kV, 50 Hz, the capacitance per phase of the bank, expressed in microfarads, is

CorrectIncorrect - Question 14 of 17
##### 14. Question

A 30 MVA, 3-phase, 50 Hz, 13.8 kV, star-connected synchronous generator has positive, negative and zero sequence reactances, 15%, 15% and 5% respectively. A reactance (Xn) is connected between the neutral of the generator and ground. A double line to ground fault takes place involving phases ‘b’ and ‘c’, with a fault impedance of j0.1 p.u. The value of Xn (in p.u.) that will limit the positive sequence generator current to 4270 A is

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

A single-phase thyristor-bridge rectifier is fed from a 230 V, 50 Hz, single-phase AC mains. If it is delivering a constant DC current of 10 A, at firing angle of 30 degree, then value of the power factor at AC mains is

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

A single-phase 400 V, 50 Hz transformer has an iron loss of 5000 W at the rated condition. When operated at 200 V, 25 Hz, the iron loss is 2000 W. When operated at 416 V, 52 Hz, the value of the hysteresis loss divided by the eddy current loss is

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

A DC shunt generator delivers 45 A at a terminal voltage of 220 V. The armature and the shunt field resistances are 0.01 Ω and 44 Ω respectively. The stray losses are 375 W. The percentage efficiency of the DC generator is

CorrectIncorrect