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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 variable loss
 constant loss
None of these
 both A and B

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 field current control
 supply voltage control
All of these
 armature circuit resistance control

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Electrical Machines
In DC shunt motor if load is increased, the speed

 increased slightly.
 increase proportional.
 remains constant.
 reduce slightly.

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

  DC of slip frequency.
 DC.
 A modulated supply frequency AC voltage with slip frequency envelop.
 AC of supply frequency.

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Electrical Machines
Poles of DC machine are often laminated to

 dissipate more heat.
 reduce armature reaction.
 reduce iron weight.
 reduce pulsation loss.

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Electrical Machines
The three point starter is used for

  Series motor.
  Shunt motor as well as compound motors.
  Shunt motor.
  Shunt, compound and series motor.

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