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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Traction.
  Food mixer.
  Lift.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero, 950 rpm.
 1000 rpm, - 50 rpm.
 1000 rpm, 950 rpm.
 zero , - 50 rpm.

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Electrical Machines
Tap changer is generally provided in

 voltage transformer.
 current transformer.
 earthing transformer.
  power transformer.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 3 or 4
 2
 1
 0

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Electrical Machines
The power factor of squirrel cage induction motor is

 both A and B
 low at rated load only
 low at heavy loads only
 low at light loads only

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Electrical Machines
The armature of DC motor is laminated

 to reduce the mass.
 to reduce the eddy current loss.
 to reduce the hysteresis loss.
 to reduce the inductor.

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