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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Lift.
  Food mixer.
  Traction.

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 not start automatically.
 develop very low starting torque.
 get damaged.
 start automatically without trouble.

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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to zero.
 None of above.
 Back emf is equal to half the applied voltage.
 Back emf is equal to applied voltage.

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

  slip.
  cogging.
  crawling.
  skewing.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt motor.
 DC shunt generator.
  DC series generator.
  DC series motor.

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Electrical Machines
Commutator in DC generator is used for

 collecting of current
 increase efficiency
 convert AC armature current in to DC
 reduce losses

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MORE MCQ ON Electrical Machines

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