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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  voltage.
  load.
  speed and voltage.

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Electrical Machines
Transformer core is laminated to reduce

 eddy current loss.
 hysteresis loss.
 copper loss.
 both 1 and 2.

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 15.30%.
 14.28%.
 18.25%.
 16.67%.

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 Permanent magnets.
  Electromagnets.
 Both B and C.
 None of the options.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 decrease.
 either of these.
None of these
 increase.

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Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  speed.
  air gap flux.
  power factor.
  magnetizing current.

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