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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
None of these
 either GNA or MNA
 GNA

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Electrical Machines
Ward Leonard control provides speed control

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

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Electrical Machines
Which type of motors uses slip rings?

 Induction motors
 DC Shunt Motor
 Synchronous motors
 Both Synchronous and Induction motor

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

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

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  capacitor run IM.
  transformer with short-circuited secondary.
  synchronous motor.
  repulsion motor type starting.

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Electrical Machines
Slip exists in

  none of above.
  induction motor.
  synchronous motor.
  in both machines.

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