Single phase induction motors Archives

series motor is connected to A.C. supply, the power factor will be low because of A. high inductance of field and armature circuits B. induced current in rotor due to variations of flux C. fine copper wire winding

none of the above

Detailed SolutionWhen a D.C. series motor is connected to

65. A universal motor can run on

D.C. only

only B.

none of the above

Detailed SolutionA universal motor can run on

66. In repulsion motor, maximum torque is developed when

brush axis is at 45Â° electrical to the field axis

brush axis coincides with the field axis

brush axis is at 90Â° electrical to the field axis

none of the above

Detailed SolutionIn repulsion motor, maximum torque is developed when

67. The wattage rating for a ceiling fan motor will be in the range

200 to 250 W

250 to 500 W

50 to 150 W

10 to 20 W

Detailed SolutionThe wattage rating for a ceiling fan motor will be in the range

68. Which of the following motor will give the highest starting torque ?

D.C. shunt motor

Schrage motor

shunt motor B. Schrage motor C. Repulsion start and induction run motor

Universal motor

Detailed SolutionWhich of the following motor will give the highest starting torque ?

69. Which of the following statements regarding reluctance-start motor is incorrect ?

It is similar to reluctance motor

It is basically an induction motor and not a synchronous one

So far as its basic working principle is concerned, it is similar to shaded pole motor

the air-gap between rotor and salient poles is non- uniform

Detailed SolutionWhich of the following statements regarding reluctance-start motor is incorrect ?

70. Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because

it is comparatively cheaper

it has almost non-destructible capacitor

it has low starting as well as running currents at relatively high power factor

it is quiet in operation

Detailed SolutionTwo-value capacitor motor finds increased application as compressor motor in small home air-conditioners because

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