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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 6000 W, 7000 W.
  3190 W, 5040 W.
 100 W, 2000 W.
 1000 W, 5040 W.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to not to get saturated.
All of these
 In order to get saturated.
 In order to get more flux.

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  providing damper winding in the rotor pole faces.
  any of above methods.
  using a flywheel.
  designing the motor for adequate synchronizing power.

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Electrical Machines
If the excitation is reduced, the power factor is

 lagging power factor
None of these
 leading power factor
 unity power factor

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Electrical Machines
In a DC Motor 3 point starter is used to

 all of above.
 provide overload protection.
 limit the starting current to a safer value.
 provide protection against Low-Voltage.

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