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 3
 2 and 3
 1 and 2
 1 alone

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Electrical Machines
The synchronous motor can be started by

  providing damper winding in its rotor circuit.
  coupling it with a DC compound motor.
  any of the above methods.
  coupling it with a small AC induction motor called the pony motor.

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Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

 there was no residual magnetism in the field circuit
 field resistance was higher than critical resistance
 field winding was wrongly connected
 there was a break in the armature circuit

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