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Electrical Machines

Electrical Machines
A generator may loose residual magnetism due to

  heating.
  vibrations.
  over excitation.
  any of these.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = ωm
 ωe = P/2*ωm
 ωe = 2/P*ωm
 ωe = P*ωm

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.9 lag
 unity
 0.2 lead
 0.2 lag

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Electrical Machines
During hunting of a synchronous motor

  field excitation increases.
  negative phase sequence currents are generated.
  damper bar develops torque.
  harmonic are developed in the armature circuit.

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Electrical Machines
Universal motors are used in

 cranes
All of these
 traction
 food processing

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Electrical Machines
The crawling in the induction motor is caused by

 harmonics developed in the motor
 improper design of stator laminations
 high loads
 low voltage supply

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MORE MCQ ON Electrical Machines

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