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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 200 V
 230 V
 460 V
 115 V

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 1 and 2
 1 and 3
 1 alone
 2 and 3

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

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

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.04, 1.96
 0.02, 1.98
 0.02, 0.98
 0.04, 0.96

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce the eddy currents.
  prevent hunting and provide the starting torque.
  reduce noise level only.
  provide starting torque only.

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Electrical Machines
For pure resistive load what is the armature reaction?

 demagnetization
 magnetization
All of these
 cross magnetization

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