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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  500 to 720.
  1440 to 2880.
  720 to 920.
  375 to 500.

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
 10 Hz.
  3 Hz.
  2 Hz.

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

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

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Electrical Machines
What is the full form of MNP?

  Magnetic field neutral plane.
  Magnetic neutral pole.
  Magnetic field neutral pole.
  Magnetic neutral plane.

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Electrical Machines
In DC machine yoke offers

 flux path completion
 produce working flux
 both A and B
 mechanical protection to the machine

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 develop very low starting torque.
 not start automatically.
 get damaged.
 start automatically without trouble.

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MORE MCQ ON Electrical Machines

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