Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
 AC synchronous motor.
 cummulative compound motor.
  series motor.

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Electrical Machines
Cogging of induction motor occurs at

 low voltage and when stator and rotor poles are not equal.
 high voltage and when stator and rotor poles are not equal.
 low voltage and when stator and rotor poles are equal.
 high voltage and when stator and rotor poles are equal.

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Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because

 the inequality of air-gap flux on the top and bottom halves of the armature is removed
 the flux waveform is improved with reduction in harmonics
 the interpoles produce additional flux to augment the developed torque
 a counter-emf is induced in the coil undergoing commutation

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