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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 44 A.
 440 A.
 400 A.
 40 A.

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 Cummulative compound.
 Series shunt.
  Differentical compound.
 have an equal number of electrons and protons.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very low speed.
 run at very high speed.
 burn.
 start haunting.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Friction and windage losses
 Hysteresis losses
 Eddy current losses
 All of the them

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 increase.
 not change.
 None of above.
 decrease.

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  stator phases of the motor.
None of these
  starting resistance in the starter.
  rotor at slip rings.

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