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Electrical Machines

Electrical Machines
The application that need frequent starting and stopping is

  paper mills.
  blowers.
  jaw crushers.
  lifts and hoists.

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

  240 rpm.
 540 rpm.
 450 rpm.
  470 rpm.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Series motor.
  Cumulative compound motor.
  Shunt motor.
  Differential compound motor.

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 Fractional horse power high speed motor.
 50 MW generator in a power plant.
 Fractional horse power slow speed motor.
  Hermetically sealed motor of refrigerator.

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Electrical Machines
Tertiary winding in a transformer is mostly

  delta connected.
 star connected.
 zig - zag delta connected.
 zig - zag star connected.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 Induction motor.
 Synchronous motor.
 DC Shunt Motor
 AC single phase motor.

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MORE MCQ ON Electrical Machines

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