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Electrical Machines

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
 3KW
 2KW
 1.5KW

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 230 V
 not possible
 some what less than 230 V
 some what more than 230 V

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

  same.
 such that actual impedance of all transformers would be same.
 inversely proportional to MVA rating of transformers.
 proportionate to MVA rating of transformers.

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

None of these
 same
 either of these
 exactly opposite

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a induction machine.
 rotor of an synchronous machine.
 rotor of a dc machine.
 stator of a dc machine.

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Electrical Machines
Transformer core is laminated to reduce

 both 1 and 2.
 copper loss.
 eddy current loss.
 hysteresis loss.

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