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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Silicon steel.
 Cast iron.
 Fibre.
 Mild steel.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 either of these
 constant V, Tst increases
 constant supply voltage V, starting torque Tst decreases
None of these

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very high.
 Normal.
 Zero.
 Very low.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Cross magnetization
 Demagnetization
None of these
 Magnetization

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

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

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Zero
None of these
 Slip speed
 Synchronous speed

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MORE MCQ ON Electrical Machines

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