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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 same.
 more.
 less than 50%.
 between 50% and 90%.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

  Develop excessive speed and damage itself.
 Produce sparking at brushes.
 Open fuse or circuit breaker.
 Draw too much current.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 625 W
 700 W
 600 W
 650 W

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 Synchronous impedance method
 American standard association method
 ZPF method
 MMf method

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

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

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing terminal voltage.
 increasing armature cooling.
  increasing armature resistance.
  increasing input power of the prime mover.

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