Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 DC Shunt Motor
 Induction motor.
 Synchronous motor.
 AC single phase motor.

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Electrical Machines
Cogging of induction motor occurs at

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

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Electrical Machines
What will happen if the the supply terminals are reversed in case of a DC shunt motor?

 The motor will run at its normal speed in the same direction as before.
 The motor will run in reverse direction.
 The motor will stop.
 The motor will run much faster in the same direction.

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