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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  make noise.
  get over heated.
  run normally.
  not run.

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Electrical Machines
Commutators in DC machines have a role of which converts

 none of these.
 AC to DC.
 Both AC to DC and DC to AC.
 high voltage DC to low voltage DC.

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 0°.
 30°.
  75°.
 45°.

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

 14.28%.
  16.67%.
 15.30%.
 18.25%.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 lagging power factor.
 leading power factor.
 any of the above.
 unity power factor.

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

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

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