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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 not run.
 run at lower speed.
 run at normal speed.

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 60
 40
 660
 600

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Power factor and field current.
 Armature current and torque.
  Armature current and field current.
 Torque and field current.

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

  Commutator.
 Radiator.
 Tap changer.
 Conservator tank.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the hysteresis loss.
 to reduce the eddy current loss.
 to reduce the inductor.
 to reduce the mass.

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Electrical Machines
The emf induced in the dc generator armature winding is

 AC and DC
None of these
 AC
 DC

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MORE MCQ ON Electrical Machines

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