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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

  Low.
 1000 ohms.
 Infinitely large.
 around 500 ohms.

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 cogging.
 plugging.
 crawling.
 locking.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces generator emf.
  reduces inter poles flux density.
  increases armature speed.
  results in sparking trouble.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  DC motor torque.
  induction motor torque.
  synchronous motor torque.
  induction generator torque.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and over excited
 heavily loaded and over excited
 lightly loaded and underecited
 heavily loaded and underexcited

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 4/3.
 16/9.
 3/4.
 9/16.

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MORE MCQ ON Electrical Machines

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