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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 250 - 500 W.
 10 - 20 W.
 200 - 250 W.
  50 - 150 W.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 2 ohm.
 0.2 ohm
 10 ohm
 100 ohm

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Electrical Machines
Diverters are used only in

None of these
 either of these
 shunt motors
 series motors

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing any two leads from supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.
  transposing all the three leads from the supply.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

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

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 reduce the magnetic hum and locking tendency of rotor.
 increase the strength of rotor bars.
 decrease the amount of copper to be used.
 provide ease of fabrication.

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MORE MCQ ON Electrical Machines

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