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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

  8.
 4.
 6.
  2.

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

 A capacitor.
  None of these.
 A resistor.
 an inductor.

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 18.18% increase
 36.36% increase
 36.36% increase
 36.36% decrease

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 start automatically without trouble.
 develop very low starting torque.
 not start automatically.
 get damaged.

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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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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 10 Ω
 100 Ω
 50 Ω
 0.1 Ω

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