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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 mild steel.
 fibre.
 cast iron.
 silicon steel.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 none of these.
 directly.
 has no relation.
 inversely.

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Electrical Machines
Open circuit test on transformer gives

 copper loss
 hysteresis loss
 both 1and 2
 eddy current loss

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 10%
 40%
 19%
 5%

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will not run.
  It will run in opposite direction.
 motor will become slow.
 It will run in same direction.

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Electrical Machines
An unexcited single phase synchronous motor is

 AC series motor.
  universal motor.
 reluctance motor.
 repulsion motor.

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MORE MCQ ON Electrical Machines

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