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Electrical Machines

Electrical Machines
A generator may loose residual magnetism due to

  heating.
  vibrations.
  any of these.
  over excitation.

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Field resistance.
 Residual magnetism of the generator.
 None of above.
 Armature resistance.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/√5
 1/3
 1/√2
 2/√5

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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)

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

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Electrical Machines
In electric locomotive which of the following motor are used ?

  Synchronous motor.
  Separately compound motor.
  Shunt motor.
  DC series motor.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt generator.
  DC series motor.
 DC shunt motor.
  DC series generator.

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