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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

  less than 1 %.
 1.5 %.
  zero.
 4 %.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 trapezoidal.
  triangular.
 sinusoidal.
 rectangular.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 240 V.
 220 V.
 150 V.
 280 V.

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 develop very low starting torque.
 get damaged.
 start automatically without trouble.
 not start automatically.

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Electrical Machines
Which of the following is not a part of transformer?

  Commutator.
 Conservator tank.
 Tap changer.
 Radiator.

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 90o.
 180o.
 0o.
 dependent upon the load.

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MORE MCQ ON Electrical Machines

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