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MCQ of Basic Electrical page-5

41. The emf induced in a coil due to relative motion of a magnet is independent of

Coil resistance
b) Magnet not visible
c) Number of coil turns.
d) Pole strength of the magnet.

42. When a single turn coil rotates in a uniform magnetic field, at uniform speed the induced emf will be

Alternating
b) Steady
c) Pulsating
d) None of these

43. Principle of dynamically induced emf is used in a

a) Choke
b) Transformer
Generator
d) Thermo-couple

44. The direction of dynamically induced emf in a conductor can be determined by

a) Fleming’s left-hand rule.
Fleming’s right-hand rule.
c) Helix rule.
d) Corkscrew rule.

45. Principle of statically induced emf is used in

Transformer
b) Motor
c) Generator
d) Battery

46. Magnitude of statically induced emf depends on the

a) Coil resistance
b) Flux magnitude
Rate of change of flux
d) None of these

47. The property of a coil by which a counter emf is induced in it, when the current through the coil changes, is called

Self inductance
b) Mutual inductance
c) Capacitance
d) None of these

48. If in an iron cored coil the iron core is removed so as to make the air-cored coil, the inductance of the coil will be

a) More
Less
c) The same
d) None of these

49. Lower the self-inductance of a coil

a) More will be the weber-turns.
b) More will be the emf induced.
c) Lesser the flux produced by it.
Smaller the delay in establishing steady current through it.

50. When an electric current is passed through a bucket full of water, lot of bubbling is there. The electric current is

a) Ac.
Dc.
c) Pulsating
d) None of these

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