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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 constant loss
 both A and B
None of these
 variable loss

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Universal motors.
  Induction motors.
  Reluctance motors.
  Stepper motors.

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Electrical Machines
In DC generators brushes are used for

 collecting of voltage
 reduce eddy current loss
 collecting of current without any sparkings
 convert ac armature current in to dc

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 100 VA
 110 VA
 500 VA
 550 VA

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  cumulatively compounded.
 differentially compounded.
  shunt connected.
  separately excited.

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

  rotor winding.
None of these
  either stator winding or rotor winding.
  stator winding.

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