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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Same as full load.
  High.
  Equal to 1.
  Low.

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 differentially compounded generator
 series generator
 shunt generator
 cumulatively compounded generator

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 9/16.
 3/4.
 4/3.
 16/9.

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

  1, 2 and 3.
 2, 3 and 4.
 2 and 4.
 1, 3 and 4.

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Electrical Machines
Series generators are used in which of the following applications?

 Air crafts.
 Arc welding.
 Used as boosters in dc distribution or transmission.
All of these

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

  75°.
 0°.
 45°.
 30°.

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