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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.
  2.73 KW.
 0.9103 KW.
 5.46 KW.

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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

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

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 less than that of second transformer.
 none of these.
 equal to that of second transformer.
  more than that of second transformer.

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Electrical Machines
Secondary winding of an auto transformer is also called

 compensating winding.
 tertiary winding.
 damping winding.
  common winding.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 Increases cost.
 increases hysteresis loss.
 makes the material brittle.
All of these

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

All of these
 Capacitor start capacitor run motor
 Resistance split phase motor
 Capacitor start motor

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