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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 unity
 leading
 lagging
 zero

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1080
 1203
 1200
 1000

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  in any of above positions.
  along neutral axis.
  along field axis.
  in none of above positions.

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Electrical Machines
What are the starters used for starting of cage motors?

 DOL starter.
  All of these.
 Star-delta starter.
 Auto transformer starter.

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Electrical Machines
Select the motor that should not be started on no load?

 Shunt motor.
 Compound motor.
 Brushless DC motor.
  Series motor.

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Electrical Machines
From no load to full load the slip will

 slightly decrease.
 slightly increase.
None of these
 not change.

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