Electrical Engineering Electromagnetics MCQ Questions Answers
1) If the number of turns of a coil is increased two times, its inductance is ______
a) increased two times
b) decreased two times
c) decreased four times
d) increased four times
2) The mutual inductance between two coils is ……. Reluctance of magnetic path.
a) directly proportional to
b) inversely proportional to
c) independent of
d) none of the above
3) The e.m.f. induced in a …….. is the statically induced e.m.f.
a) d.c generator
b) transformer
c) d.c motor
d) none of the above
4) If the number of turns of a coil is increased, its inductance ………
a) remains the same
b) is increased
c) is decreased
d) none of the above
5) An iron-cored coil of 10 turns has reluctance of 100 AT/Wb. The inductance of the coil is ….
a) 1 H
b) 10 H
c) 0.1 H
d) 5 H
6) An 8-H choke is carrying a current of 500 mA. The energy stored in the magnetic field is……
a) 1 J
b) 0.5 J
c) 2 J
d) 4 J
7) The mutual inductance between two unity coupled coils of 9 H and 4 H is……….
a) 36 H
b) 13 H
c) 2.2 H
d) 6 H
8) If the frequency of flux is increased two times, the eddy current power loss is ……..
a) increased two times
b) decreased two times
c) increased four times
d) decreased four times
9) In the above question, what is the coefficient of coupling?
a) 0.5
b) 0.1
c) 0.26
d) 0.23
10) A 100 mH coil carries a current of 1 A. Energy stored in the magnetic field is
a) 1J
b) 0.05 J
c) 1.5 J
d) 2.5 J