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Electrical Machines

Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

  2 - 3 µF.
  1 - 2 µF.
 0.1 µF.
 5 - 10 F.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 one fourth.
 double.
 half.
 4 times.

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 either of these depending on the design of the motor
 in parallel
 through inductive coupling
 in series

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Electrical Machines
Skewing of cage rotors offers the following advantages

  locking tendency is reduced.
  all of below.
  less noise.
  uniform torque.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 varying the applied voltage.
 varying the speed.
 changing the field excitation.
 changing the load.

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Electrical Machines
Secondary winding of an auto transformer is also called

 tertiary winding.
 compensating winding.
 damping winding.
  common winding.

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MORE MCQ ON Electrical Machines

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