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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 1.644 KW.
 0.9103 KW.
 5.46 KW.
  2.73 KW.

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Electrical Machines
Transformer oil is used as

 an insulator.
 inert medium.
 both A and B.
 a coolant.

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 0.5Kw
 1.5KW
 3KW
 2KW

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 30°
 18°
 72°
 36°

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Electrical Machines
In DC machine shape of main field flux distribution is?

 peaky in nature
 flat tapped or trapezoidal
 triangular
 saddle shape

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide protection against Low-Voltage.
 all of above.
 limit the starting current to a safer value.
 provide overload protection.

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