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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/(1-S)
 1/S
 1-S
 S

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 30.
 45.
 180.

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

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

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Electrical Machines
What is the highest possible speed of turbo alternators?

 4000 rpm
 1500 rpm
 3000 rpm
 1000 rpm

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  either field terminals are reversed or armature terminals are reversed.
  only field terminals are changed.
  only armature terminals are reversed.
  none of above.

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Electrical Machines
Generators work on the principle of production of

 statically induced emf.
 dynamically induced emf.
 dynamically and statically induced emf.
None of these

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MORE MCQ ON Electrical Machines

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