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Electrical Machines

Electrical Machines
Diverters are used only in

 shunt motors
 series motors
None of these
 either of these

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 27.73 Nm .
 74 Nm.
  65.8 Nm.
 38.5 Nm.

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Electrical Machines
The constant losses in transformer is/are

 both 2 and 3.
 hysteresis loss.
 copper loss.
 eddy current loss.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 remains same.
 kept constant to certain value.
 decreased.
  increased.

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Electrical Machines
Capacitor start capacitor run provides

  high staring torque and high power factor.
  high power factor only.
  none.
  high staring torque only.

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

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

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MORE MCQ ON Electrical Machines

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