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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  decrease in speed.
  open circuit.
  short circuit.
  increase in speed.

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 decrease
 increase
None of these
 either increase or decrease

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Electrical Machines
The shaft of induction motor should be

  any of these.
  flexible.
  hollow.
  stiff.

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Coulombs law.
 Newtons law.
 Amperes law.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Supply voltage.
  Field excitaion.
  Armature current.
  Armature voltage.

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Electrical Machines
During hunting of a synchronous motor

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

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