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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1450W
 1920W
 1820W
 2000W

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  starting resistance in the starter.
None of these
  stator phases of the motor.
  rotor at slip rings.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of hydro generator.
 greater than that of turbo alternator.
 equal to that of the effective length of the line.
  none of these.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 decreased.
 kept constant to certain value.
 remains same.
  increased.

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Electrical Machines
The stator frame in an induction motor is used to

  ventilate the armature.
  protect the whole machine.
  hold armature stamping in position.
  provide return path for the flux.

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 541.67V, 200 rpm.
 2166.67V, 230 rpm.
 541.67V, 250 rpm.
 2166.67V, 270 rpm.

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