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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  aluminium.
  carbon.
  phosphor bronze.

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Electrical Machines
Slot wedges in a dc machine is made up of

 cast iron.
 fibre.
 silicon steel.
 mild steel.

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

 draw too much current.
 produce sparking at brushes.
 develop excessive speed and damage itself.
 open fuse or circuit breaker.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with increase in the load torque.
 decreases with decrease in the load torque.
 increases with increase in the load torque.
 remains constant.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 line to line fault.
  line to ground fault.
 3 - phase fault.
 3 - phase to ground fault.

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 0 Hz
 50 Hz
 100 Hz

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MORE MCQ ON Electrical Machines

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