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Electrical Machines

Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger output.
  larger bore diameter.
  both.
  none.

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 30°.
 45°.
 24°.
  10°.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 2000W
 1920W
 1820W
 1450W

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Electrical Machines
Armature reaction in DC generators will result in

 increase in slip.
 short circuit.
 open circuit.
 reduction in generated emf.

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Electrical Machines
In DC machine torque is proportional to which of the following?

 flux(φ)
None of these
 armature current(Ia)
 both A and B

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Electrical Machines
Which of the following are variable losses?

 eddy current loss
 armature copper loss
 shunt field copper loss
 hysteresis loss

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