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MCQ of Basic Electrical page-5

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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

b) Steady
c) Pulsating
d) None of these

43. Principle of dynamically induced emf is used in a

a) Choke
b) Transformer
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

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
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.
c) Pulsating
d) None of these

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Multiple Choice Question (MCQ) of Materials page-6:
51. The permeability and permittivity of a medium are
A) independent of each other
B) related by the atomic number
C) related by the Boltzmann’s constant
D) related by the velocity of electromagnetic waves.


Multiple Choice Question (MCQ) of Materials page-5:
41. Bakelite is
A) highly inflammable
B) low resistance conductor
C) a semi-conductor
D) uncombustible.


Multiple Choice Question (MCQ) of Materials page-4:
31. Which of the following pairs is commonly used in thermocouples?
A) Copper-constant
B) Aluminium-tin
C) Iron-steel
D) Silver-German silver.