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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 remains same.
 increases.
 decreases.
None of these

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 750 rpm
 3000 rpm
 1000 rpm
 1500 rpm

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Electrical Machines
The type of DC motor used for shears and punches is

  Cummulative compound motor.
 Series motor.
 Shunt motor.
 Differential compound motor.

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

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

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Collecting of large current is simple.
All of these
 Insulation requirement is less.
 Operating cost is less.

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Electrical Machines
In an auto-transformer, power is transferred through

None of these
 both A and B.
 conduction process only.
 induction process only.

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