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Electrical Machines

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

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

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Electrical Machines
If a DC motor is connected across the AC supply it will

 Run at normal speed.
 Run at lower speed.
 Not run.
  Burn.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as small as possible.
  air gap does not matter.
  depends on the material of stator and the rotor.
  as wide as possible.

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Electrical Machines
Which of the DC Motor use flywheel?

 Cumulatively compound motor.
 Differently compared motor.
 Shunt motor.
 Series motor.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Heavy sparking at the first stud of starting resistance steps.
 Heavy sparking at brushes.
 None of these.
 Both of above.

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

  13 HP.
  10 HP.
 14 HP.
 15 HP.

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MORE MCQ ON Electrical Machines

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