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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Zero.
 Very high.
 Normal.
 Very low.

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Electrical Machines
Swinburne's test is applicable to

 DC series motor.
 DC compound motor.
 DC shunt and level Compound motor.
 DC Shunt motor.

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve power factor.
  Improve power level.
  Improve current level.
  Improve voltage level.

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

All of these
 conduction.
 radiation.
  convection.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Iara+ ILrs
 Vt= Ea + Iara
 Vt = Ea + Ia(ra + rs)
 Vt= Ea– Iara

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Electrical Machines
The material used for commutator brushes is mostly

 mica.
  carbon.
 copper.
 cast iron.

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