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Electrical Machines

Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 core.
 none of these.
 armature.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

 0.75 Hz.
  0.65 Hz.
 0.70 Hz.
  60 Hz.

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Electrical Machines
Hunting in a synchronous motor takes place

  when power factor is unity.
  when supply voltage fluctuates.
  motor is under loaded.
  when load varies.

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Electrical Machines
A single-winding single-phase motor has

 high starting torque.
 starting torque equal to full-load torque.
  zero starting torque.
 low starting torque.

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Electrical Machines
The output power of any electrical motor is taken from the

 Field.
 Armature.
 Coupling mounted on the shaft.
 Motor frame.

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Electrical Machines
Induction motors provided with open slots have

  less breakdown torque.
  more breakdown torque.
  leading power factor.
  higher efficiency.

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MORE MCQ ON Electrical Machines

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