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Electrical Machines

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  maximum.
  constant.
  minimum.

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

  256.4 V.
 238.2 V.
 271.7 V.
 240 V.

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Running torque.
 Line voltage.
 Slip.
 Rotor current.

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 0.5.
 Greater than 1.
 0.25.
 near to 1.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 1500 rpm
 75 rpm
 3000 rpm
 375 rpm

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Electrical Machines
Capacitor in split phase induction motor is used to

 improve the power factor.
 start the motor.
 reduce the harmonics.
 improve the starting torque.

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MORE MCQ ON Electrical Machines

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