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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

  2.73 KW.
 1.644 KW.
 5.46 KW.
 0.9103 KW.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting current will be enormously high.
 the starting torque becomes low.
 the motor may run away.
 the motor may not start.

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Electrical Machines
Ward Leonard control provides speed control

 below rated speed.
 in both direction.
 above rated speed.
 in one direction only.

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Electrical Machines
If the field circuit of a DC shunt motor is opened

  The motor will attain dangerously high speed.
 The armature current will reduce.
 DC Shunt Motor
 The speed of motor will be reduced.

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

  variable.
  minimum.
  constant.
  maximum.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  cogging.
  crawling.
  skewing.
  slip.

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MORE MCQ ON Electrical Machines

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