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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 0
 2
 3 or 4
 1

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Electrical Machines
The reduced air gap results in an increase

  power factor.
  cost of operation.
  starting torque.
  breaking torque.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 high maintenance cost.
 all of above.
 high initial cost.
 poor overall efficiency.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 both 1 and 2
 Copper loss
 core loss only
 windage and friction loss

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Electrical Machines
In a DC Motor 3 point starter is used to

 all of above.
 provide overload protection.
 limit the starting current to a safer value.
 provide protection against Low-Voltage.

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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

 8 Ω.
  2 Ω.
 10 Ω.
  4 Ω.

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MORE MCQ ON Electrical Machines

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