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Multiple Choice Question (MCQ) of Induction Motors page-5

41. Motor commonly used for traction purpose is

a) Induction motor
b) Dc series motor
c) Dc shunt motor
d) Synchronous motor

Ans: (b)

42. In a double cage induction motor, the inner cage has

a) Low R and low X
b) Low R and high X
c) High R and high X
d) High R and low X

Ans: (b)

43. Maximum power developed in a synchronous motor occurs at a coupling angle of

a) 0°
b) 60°
c) 90°
d) 120°

Ans: (c)

44. The back emf set up in the stator of synchro-nous motor depends on

a) Speed of the rotor
b) Input to prime mover
c) Rotor excitation
d) Coupling angle

Ans: (c)

45. The speed of a three-phase cage-rotor induction motor depends on

a) Number of pole alone
b) Frequency of the supply alone
c) Input voltage
d) Number of poles and frequency of supply

Ans: (d)

46. Synchronous induction motors are mostly used for driving

a) Rotary compressors
b) Cranes
c) Lathe machines
d) None of these

Ans: (a)

47.Dispersion coefficient o is the ratio of

a) Magnetizing current to ideal short circuit current
b) Magnetizing current to supply voltage
c) Open circuit voltage to short circuit current for the same excitation
d) None of these

Ans: (a)

48. The noise and tooth pulsation losses may be reduced by using

a) Large number of open slots in stator
b) Large number of narrow slots in stator
c) small number of open slots in stator
d) Small number of narrow slots in stator

Ans: (b)

49. The faction slip of an induction motor is to ratio

a) Rotor Cu loss/rotor input
b) Rotor Cu loss/rotor output
c) stator Cu loss/stator input
d) Rotor Cu loss/stator Cu loss

Ans: (a)

50. When a 3-phase synchronous motor is switched on, three exists a rotating magnetic field. The magnitude of this field flux

a) Varies with power factor
b) Varies with load
c) Is constant at all loads
d) None of these

Ans: (c)

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