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Electrical Machines

Electrical Machines
Stepper motor is used in

 traction
All of these
 computer printers
 food processing

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

 triangular.
  sinusoidal.
  pulsating.
  flat topped.

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

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

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BYR
 BRY
 RBY
All of these

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

 10 Ω.
 8 Ω.
  2 Ω.
  4 Ω.

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 25 Hz.
 Zero Hz.
 100 Hz.
 50 Hz.

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MORE MCQ ON Electrical Machines

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