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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  none of these.
  wound.
  linear.
  cage.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 50 V
 zero
 20 V
 40 V

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant power control
 constant torque control
 constant voltage control
 constant current control

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 6 / 7.
 5 / 6.
  4 / 5.
 2 / 3.

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

 Stator core loss
 Rotational loss
 Stator copper loss
All of these

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to twice of applied voltage.
 back emf is equal to half of applied voltage.
 back emf is equal to applied voltage.
 none of above.

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