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Electrical Machines

Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  none of these.
  increased.
  reversed.
  modified.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1450.
 1440.
  1435.
 1500.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 efficiency.
 running torque.
 speed regulation.
 starting torque.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting torque.
 more starting time.
 reduced starting current.
 smoother acceleration.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/√3
 1/3, 1/3
 1/√3, 1/3
 1/√3, 1/√3

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Electrical Machines
Alternator operates on the principle of

  self induction.
  mutual induction.
  self or mutual induction.
  electromagnetic induction.

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