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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / V2
 (V2 - E2) / V2
 (V2 - E2) / E2
 (E2 - V2) / E2

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 continuity supply is maintained
All of these
 Increase in reliability
 Increase efficiency under light load conditions

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Electrical Machines
Tertiary winding in a transformer is mostly

  delta connected.
 zig - zag delta connected.
 zig - zag star connected.
 star connected.

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 750rpm
 1000 rpm
 zero speed
 1500 rpm

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Triangular and directed towards main pole.
 Triangular and directed towards brush axis.
 Peaky in nature.
 Saddle shape.

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

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

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