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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 Induction motor.
  DC series.
 DC shunt.
 DC compound.

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

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

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  less costly motor is not required.
 power factor is less.
  low starting torque.
  high starting torque.

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

  slip.
  crawling.
  skewing.
  cogging.

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Electrical Machines
In escalator which motor is used?

  1 - φ IM.
  3 - φ IM.
  DC shunt motor.
  Universal motor.

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 10 KVA
 6 KVA
 4 KVA
 0 KVA

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