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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  2.5 %.
  15 %.
 10 %.
  20 %.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Centrifugal pumps.
  Conveyers.
 Air compressors.
 Blowers.

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V
 f2
 V2
 f

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

  Full load.
 None of these.
 Low load.
 No load.

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Electrical Machines
Equalizer rings are used in which of the followings?

None of these
 both 1 and 2
 lap winding
 wave winding

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Electrical Machines
Wave winding is prefered for which of the following rating?

 high current and low voltage
 low current and low voltage
 low current and high voltage
 high current and high voltage

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