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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/(1-S)
 1/S
 S
 1-S

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 4.
  8.
 6.
  2.

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  statically induced voltage.
None of these
  reactance voltage.
  dynamically induced voltage.

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

 Reduce by 5%.
 Depends on other factor.
 Remain unchanged.
  Increase by 5%.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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

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

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