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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 co- sinusoidal
 flat-topped
 sinusoidal

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Series.
 Compound (cummolative).
 none of these.
  Shunt.

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  AC slip ring IM.
  Capacitor type induction motors.
  Reluctance motor.
  DC series motor.

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Electrical Machines
Lamination of core are generally made of

 cast iron.
 silicon steel.
 carbon.
 stainless steel.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 poor overall efficiency.
 all of above.
 high initial cost.
 high maintenance cost.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

  60 Hz.
  0.65 Hz.
 0.75 Hz.
 0.70 Hz.

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