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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?

 2KW
 3KW
 0.5Kw
 1.5KW

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt generator.
 DC shunt motor.
  DC series motor.
  DC series generator.

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Electrical Machines
Armature reaction in dc motor results

  increase in speed.
  decrease in speed.
  open circuit.
  short circuit.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at heavy loads only
 low at light loads only
 both A and B
 low at rated load only

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

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

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Electrical Machines
Drop in speed from no load to full load is very high in

 Shunt motor with interpoles.
 Cummulative compound motor with interpoles.
 Series motor with interpoles.
  Series motor without interpoles.

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