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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  20 %.
  2.5 %.
 10 %.
  15 %.

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Insulation requirement is less.
 Collecting of large current is simple.
All of these
 Operating cost is less.

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Electrical Machines
Rotating part of DC motor is known as

 Armature.
 Starter.
 Pole.
 Carbone brush.

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 0.25Ω.
 1Ω.
 0.5Ω.
  0.23Ω.

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Electrical Machines
The reduced air gap results in an increase

  starting torque.
  breaking torque.
  cost of operation.
  power factor.

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Electrical Machines
Which of the following motor has negative speed regulation?

 Series motor
 Cumulative compound motors
 Shunt motor
 Differential compound motor

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