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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 480 V.
 400 V.
 350 V.
 420 V.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

All of these
 Resistance split phase motor
 Capacitor split phase motor
 Capacitor run motor

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 decrease and increase respectively
 increase and decrease respectively
 both decrease
 both increase

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Electrical Machines
Transformer action requires a

 alternating magnetic lux.
 constant magnetic flux.
 increasing magnetic flux.
 alternating electric flux.

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Electrical Machines
A small air gap in poly phase induction motor helps to

  reduce magnetizing current.
 reduce chance of crawling.
 reduce chance of cogging.
 increase starting torque.

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Electrical Machines
Breather is provided in a transformer to

 provide cold air in transformer.
 absorb moisture from air entering in transformer.
 filter the transformer oil.
  absorb moisture of air during breathing.

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MORE MCQ ON Electrical Machines

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