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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 in reverse.
 to earth.
 to an AC source.
  to a DC source.

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Electrical Machines
In case of DC shunt motor if load is reduced

  The speed will remains almost constant.
 The speed will increase abruptly.
 The speed will increase in proportion to reduction in load.
 DC Shunt Motor

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 800W, 1600W
 1600W, 800W
 1400W, 1000W
 1000W , 1400W

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.8.
 0.4.
 0.6.
  1.

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

 145 Ω.
  375 Ω.
 150 Ω.
 225 Ω.

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