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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature voltage control.
 Field resistance control.
 Any of above.
 Armature circuit resistance control.

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 both the torque and voltage
 voltage but not the torque
 torque but not the voltage
 neither the voltage nor the torque

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Electrical Machines
Slip exists in

  synchronous motor.
  in both machines.
  none of above.
  induction motor.

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1 and 3
 1, 2 and 3
 1 and 2
 2 and 3

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

  Paraffin based insulating oil.
 Naphtha based insulating oil.
 Olefin based insulating oil.
 Aromatics based insulating oil.

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