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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Fibre.
 Mild steel.
 Cast iron.
 Silicon steel.

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

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

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Electrical Machines
For larger units high torque it is preferred to use

 DC shunt motor.
 Slip induction motor.
 Universal motor.
 Partial motor.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

  Develop excessive speed and damage itself.
 Produce sparking at brushes.
 Draw too much current.
 Open fuse or circuit breaker.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Periodic variation of load.
  Over-excitation.
  Over-loading for long period.
  Small and constant load.

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 16.67%.
 14.28%.
 18.25%.
 15.30%.

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MORE MCQ ON Electrical Machines

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