Electromagnetics MCQ Questions Answers Electrical Engineering


11) In the above question, if the coils are connected in series – opposition, then total inductance is

a) 1 H

b) zero

c) 2 H

d) 4 H

View Answer
Option – b)

12) If L and R denote inductance and resistance respectively, then dimensions of L/R are

a) M L2 T0

b) M2 L0 T

c) M0 L0 T

d) none of the above

View Answer
Option – c)

13) Choke coil works on the principle of

a) mutual inductance

b) self-inductance

c) dynamically induced e.m.f.

d) none of the above

View Answer
Option – c)

14) If time constant of RL series  circuit is 40ms, how long does it take to discharge?

a) 80 ms

b) 120 ms

c) 200 ms

d) 160 ms

View Answer
Option – c)

15) A current through a coil of inductance 5 H is decreasing at the rate of 2 A/sec. The e.m.f. induced in the coil is

a) 2.5 V

b) – 2V

c) -10 V

d) 10 V

View Answer
Option – d)

16) A coil of radius R has 400 turns and a self-inductance of 32 mH. What will be the inductance of a similar coil of 300 turns?

a) 18 mH

b) 64 mH

C) 8 mH

d) 16 mH

View Answer
Option – a)

17) If N is the number of turns of the coil, the inductance varies as

a) N0

b) N

c) N-2

d) N2

View Answer
Option – d)

18) When magnetic flux linking a conductor changes,

a) an e.m.f. is always induced

b) a current is always induced]

c) both e.m.f. and current are always induced

d) neither e.m.f. nor current is inducted

View Answer
Option – a)

19) The cores in electrical machines are generally made of laminations to reduce

a) hysteresis loss

b) eddy current loss

c) copper loss

d) all above

View Answer
Option – b)

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