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Electrical Machines

Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 negative.
 low.
  zero.
 positive.

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

  Effiency.
 Starting torque.
 Running Torque.
 Speed regulation.

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 increased.
 decreased.
 kept constant to certain value.
  remains unchanged.

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 115 V.
 200 V.
 460 V.
 230 V.

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Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / V2
 (V2 - E2) / E2
 (E2 - V2) / V2
 (E2 - V2) / E2

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 5 Hz
 50 Hz
 1 Hz

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