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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 0 V
 4 V
 1 V

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Electrical Machines
In DC machines shape of net flux density is?

 sine wave
 peaky in nature
 flat tapped or trapezoidal
 saddle shape

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Electrical Machines
Fufuraldehyde analysis is done to determine the

  condition of paper insulation in transformer.
 condition of oil in transformer.
 condition of cork gaskets used in transformer.
 condition of lamination on CRGO steel sheet.

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

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

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Any of above.
 Armature circuit resistance control.
 Armature voltage control.
 Field resistance control.

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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 shunt motor.
  DC series motor.
  DC series generator.

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