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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC motor
 DC generator
 induction motor
 AC generator

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Both torque and speed decrease.
 Torque and speed both increase.
 Torque decrease and speed increases.
  Torque increase and speed decrease.

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Electrical Machines
What is the full form of MNP?

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

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1500 rpm
 1470 rpm
 zero
 30 rpm

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

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

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

None of these
  Bush bearings.
  Cast iron bearings.
  Ball bearings.

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MORE MCQ ON Electrical Machines

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