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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

  It is a constant speed motor.
 It is a variable speed motor.
 It is a high reluctance motor.
 It is a step angled motor.

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Electrical Machines
Which of the following is the largest conversion device?

 Induction machine
All of these
 Synchronous machine
 DC machine

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Electrical Machines
_____________ types of induction motor are widely used.

  Three phase IM.
  Single phase IM.
  Slip ring IM.
  Squirrel cage IM.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1500 rpm
 1470 rpm
 30 rpm
 zero

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Compound (cummolative).
 Series.
 none of these.
  Shunt.

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