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Electrical Machines

Electrical Machines
Armature resistance control method is used for the _______ ?

None of these
 both 1 and 2
 above rated speed
 below rated speed

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 2 point starter
 4 point starter
All of these
 3 point starter

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Increase speed
 Reduce starting torque.
 Reduce armature heating.
 Increase acceleration duration.

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Electrical Machines
Which of the following motor is used in grinders?

  Split phase IM.
  Capacitor start capacitor run IM.
  Capacitor start IM.
  Synchronous motor.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 changing the field excitation.
 changing the load.
 varying the speed.
 varying the applied voltage.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 lagging
 leading
 unity
 zero

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