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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 cast iron.
 copper.
 mica.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque increases
 less and maximum torque decreases
 more and maximum torque remains constant
 more and maximum torque decreases

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 No wave and lap winding.
 Lap winding.
 Both wave and lap winding.
 Wave winding.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 wet grinders
 food mixers
 tape recorders
 personal computers as cooling fan

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Electrical Machines
What is the full form of MNP?

  Magnetic neutral pole.
  Magnetic field neutral plane.
  Magnetic neutral plane.
  Magnetic field neutral pole.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start capacitor run motor
All of these
 Resistance split phase motor
 Capacitor start motor

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