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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
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 234 V
 6 V
 474 V
 240 V

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Electrical Machines
Total core loss is also called as -------------?

 Magnetic loss
 Eddy current loss
 Hysteresis loss
 Copper loss

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

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

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 eddy current torque.
 no torque.
 damping torqe.
 both 1 and 2.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 0
 2
 3 or 4
 1

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