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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
Transformers operating in parallel will share the load depending upon their

 efficiency.
 percentage impedance.
 leakage reactance.
 rating.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 rating of generators should be same.
 polarities should be same.
 terminal voltage should be same.
 both A and B.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Both 1 and 2
 Copper losses
 Hysteresis losses
 Eddy current losses

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

 15.30%.
 18.25%.
 14.28%.
  16.67%.

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 1000 rpm
 1500 rpm
 750rpm
 zero speed

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