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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 1.5KW
 3KW
 2KW
 0.5Kw

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature current.
  Armature voltage.
  Field excitaion.
  Supply voltage.

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Electrical Machines
The starting resistance of DC motor is generally

 Infinitely large.
 around 500 ohms.
 1000 ohms.
  Low.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Remains unchanged.
  Decreases.
 Increases.
 Oscillates around the rated speed.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 1.92
 0.08
 -1.92
 -0.08

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same prime mover speed
 same voltage magnitude
 same phase sequence
 same frequency

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