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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V²
 1/V
 V²
 supply voltage V

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Electrical Machines
The field system of an alternator is usually excited

  230 V AC.
  250 / 250 V DC.
  110 / 220 V AC.
  3 - Φ, 50 Hz and 400 V.

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

  30 Hz.
 20 Hz.
 35 Hz.
  Can be determined.

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Electrical Machines
A series motor is efficiently suitable for

  high starting torque operation.
 constant speed operation.
 none of these.
 low starting torque operation.

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Electrical Machines
The power developed by salient pole synchronous machine is/are

 power due to saliency or reluctance only
 both 1 and 2
None of these
 excitation power only

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Electrical Machines
The shaft of induction motor should be

  stiff.
  hollow.
  any of these.
  flexible.

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MORE MCQ ON Electrical Machines

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