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5. Leakage flux in an induction motor is
(A) flux that leaks through the machine
(B) flux that links both stator and rotor windings
(C) flux that links none of the windings
(D) flux that links the stator winding or the rotor winding but not both
Answer: (D)

6. The angle d in the swing equation of a synchronous generator is the
(A) angle between stator voltage and current
(B) angular displacement of the rotor with respect to the stator
(C) angular displacement of the stator mmf with respect to a synchronously
rotating axis.
(D) angular displacement of an axis fixed to the rotor with respect to a
synchronously rotating axis.
Answer: (D)

8. A band-limited signal with a maximum frequency of 5 kHz is to be sampled.
According to the sampling theorem, the sampling frequency in kHz which is not
valid is
(A) 5 (B) 12 (C) 15 (D) 20
Answer (A)

9. For a periodic signal v(t) 30 sin 100 t 10 cos 300 t 6 sin(500 t ),
4
p
= + + + the
fundamental frequency in radians/s is
(A) 100 (B) 300 (C) 500 (D) 1500
Answer (A)

10. A bulb in a staircase has two switches, one switch being at the ground floor and
the other one at the first floor. The bulb can be turned ON and also can be
turned OFF by any one of the switches irrespective of the state of the other
switch. The logic of switching of the bulb resembles
(A) an AND gate (B) an OR gate (C) an XOR gate (D)a NAND gate
Answer (C)

16. The flux density at a point in space is given by 2
x y z B 4xa 2kya 8a Wb /m . = + +
The value of constant k must be equal to
(A) -2 (B) -0.5 (C) +0.5 (D) +2
Answer: (A)

17. A single-phase transformer has no-load loss of 64 W, as obtained from an opencircuit
test. When a short-circuit test is performed on it with 90% of the rated
currents flowing in its both LV and HV windings, he measured loss is 81 W. The
transformer has maximum efficiency when operated at
(A) 50.0% of the rated current. (B) 64.0% of the rated current.
(C) 80.0% of the rated current. (D) 88.8% of the rated current.
Answer: (C)