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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at normal speed.
 run at lower speed.
 burn.
 not run.

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same prime mover speed
 same frequency
 same phase sequence
 same voltage magnitude

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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to applied voltage.
 Back emf is equal to zero.
 None of above.
 Back emf is equal to half the applied voltage.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  AC slip ring motor.
  Synchronous motor.
  DC series motor.
  Single phase induction motor.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f
 f²
 V²
 V

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1000 rpm
 750 rpm
 3000 rpm
 1500 rpm

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