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Electrical Machines

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

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

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

None of these
  delta.
  star.
  delta or star according to need.

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Electrical Machines
In double cage induction motor, the outer cage offers

  low resistance and low reactance.
  low resistance and high reactance.
  high resistance and low reactance.
  high resistance and high reactance.

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 copper loss.
 vibrations.
 eddy electric current loss.
 hysteresis loss.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  differential compounded.
  shunt.
  under-compounded.
  over compounded.

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Electrical Machines
Swinburne's test is applicable to

 DC compound motor.
 DC series motor.
 DC Shunt motor.
 DC shunt and level Compound motor.

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