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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 copper.
 cast iron.
 mica.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 95%
 96%
 94%
 92%

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and high
 low and high
 high and low
 low and low

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting current will be enormously high.
 the motor may not start.
 the motor may run away.
 the starting torque becomes low.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 three.
 six.
 two.
 four.

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 an induction motor
 a synchronous motor
None of these
 an induction generator

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MORE MCQ ON Electrical Machines

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