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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 hysteresis loss
 eddy current loss
 copper loss
 total iron losses

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Electrical Machines
When a DC cummulative compound wound motor is loaded

  Torque increase and speed decrease.
 Torque decrease and speed increases.
 Torque and speed both increase.
 Both torque and speed decrease.

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 American standard association method
 Synchronous impedance method
 ZPF method
 MMf method

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 zero.
 less than normal speed.
 normal speed.
 more than normal speed.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  decreases.
  remains constant.
  increases upto a limit and then remains almost constant.
 increases.

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

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