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Electrical Machines

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  maximum.
  constant.
  variable.
  minimum.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 increase the permeability.
 reduce eddy current loss only.
 reduce both eddy current and hysteresis loss.
 reduce hysteresis loss only.

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Electrical Machines
The function of field regulator in a DC compound motor is to

 none of above.
 vary the armature resistance.
 control field current.
 limit the armature current.

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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
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 decrease and increase respectively
 increase and decrease respectively
 both increase
 both decrease

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

  region under main pole.
 interpole region.
 throughout the air gap.
None of these

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