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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  run normally.
  get over heated.
  make noise.
  not run.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 kept constant to certain value.
 decreased.
 remains same.
  increased.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 starters
 field winding
 commutator
 armature winding

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
 GNA
 either GNA or MNA
None of these

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 0.5Ω.
  0.23Ω.
 1Ω.
 0.25Ω.

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 1.644 KW.
 5.46 KW.
  2.73 KW.
 0.9103 KW.

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