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Electrical Machines

Electrical Machines
On what factors the speed of dc motor depends?

 All of these.
 Field flux.
 Applied voltage.
 Armature current Ia.

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Electrical Machines
The brushes of a DC machine should be placed on the

 armature in the polar axis.
 armature midway between poles.
 commutator in the inter polar axis.
 commutator in the polar axis.

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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

 just behind the magnetic neutral axis.
 just ahead of magnetic neutral axis.
 in magnetic neutral axis.
None of these

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Electrical Machines
Field weakening method is also called as-----------?

 constant voltage control
 constant torque control
 constant current control
 constant power control

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in opposite direction.
 motor will not run.
 it will run in same direction.
 it will run in same direction by slowly.

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 0.1 µF.
  1 - 2 µF.
 5 - 10 F.
  2 - 3 µF.

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