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Electrical Machines

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

 either GNA or MNA
None of these
 MNA
 GNA

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetization as well as demagnetization.
  none of above.
 demagnetisation.
  cross-magnetisation.

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Electrical Machines
Methods of synchronizing of alternator may be done by

 all bright lamp method.
 one dark two bright.
 all dark lamp method.
  all of these.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 armature connections.
 series field connections.
 armature or field connections.
 shunt field connections.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 4*ωm
 ωe = 2*ωm
 ωe = 1/2*ωm
 ωe = ωm

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T∝ V²
 T ∝ 1/V²
 T ∝ V
 T ∝ 1/V

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