Single phase induction motors

63. In case of high speed universal motor which of the following needs more attention ?

End play
Air gap
Insulation in rotor
Balancing of rotor

Detailed SolutionIn case of high

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speed universal motor which of the following needs more attention ?

64. When a D.C. series motor is connected to

high inductance of field and armature circuits
induced current in rotor due to variations of flux
none of the above

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

65. A universal motor can run on

D.C. only
D.
only B.
none of the above

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href="https://exam.pscnotes.com/mcq/a-universal-motor-can-run-on/#more-49503">Detailed SolutionA universal motor can run on

66. In repulsion motor, maximum torque is developed when

brush axis is at 45° electrical to the field axis
brush axis coincides with the field axis
brush axis is at 90° electrical to the field axis
none of the above

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6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube developed when" class="read-more button" href="https://exam.pscnotes.com/mcq/in-repulsion-motor-maximum-torque-is-developed-when/#more-49195">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

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href="https://exam.pscnotes.com/mcq/the-wattage-rating-for-a-ceiling-fan-motor-will-be-in-the-range/#more-48907">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

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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
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

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288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube
finds increased application as compressor motor in small home air-conditioners because

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