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Electrical Machines

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
When operating, two or more transformers in parallel, % impedance of these transformers should be

 inversely proportional to MVA rating of transformers.
  same.
 proportionate to MVA rating of transformers.
 such that actual impedance of all transformers would be same.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 three.
 six.
 two.
 four.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea + Iara
 Vt = Ea + Ia(ra + rs)
 Vt = Ea + Iara+ ILrs
 Vt= Ea– Iara

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  hysteresis losses.
  mechanical losses.
  eddy current losses.
  ohmic losses.

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Electrical Machines
In shapers and slotters which motor are preferred?

  Slip ring IM.
  Squirrel cage IM.
  Synchronous motor.
  Double cage motor.

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