Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1, 2 and 3
 1 and 3
 2 and 3
 1 and 2

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Electrical Machines
The synchronous motor can be started by

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

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Electrical Machines
In a DC machine, for the same value of φ, Z and N; which one of the following statements is correct?

  Armature emf is more with wave winding than with lap winding.
 Armature emf depends on weather the machine is running as a motor or generator.
 Armature emf is same as long as the flux density in the air gap remains the same.
 Armature emf is less with wave winding than with lap winding.

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