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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 parabola
 hyperbola
 any of the above
 linearised

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to get saturated.
 In order to not to get saturated.
 In order to get more flux.
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

  2 Ω.
 10 Ω.
 8 Ω.
  4 Ω.

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 500.
 2000.
 1000.
 0.

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Electrical Machines
Which of these types of motor is used in elevators?

 None of these.
 DC compound motor.
 DC shunt motor.
 DC series motor.

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Electrical Machines
The function of field regulator in a DC compound motor is to

 limit the armature current.
 control field current.
 vary the armature resistance.
 none of above.

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MORE MCQ ON Electrical Machines

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