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Electrical Machines

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

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

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 synchronous reactance
 load angle
 excitation
 both 1and 2

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Electrical Machines
If input of a transformer is square wave the output will be

 square wave.
 triangular wave.
 sine wave.
  pulsed wave.

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 not change.
 decrease.
 None of above.
 increase.

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/120.
 PN/2.
 PN/60.
 PN/3000.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 10
 100
 1
 50

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