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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 115 V.
 460 V.
 230 V.
 200 V.

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Electrical Machines
Satisfactory commutation of DC machine requires

 brushes should be of proper grade and size.
 smooth, concentric commutator properly undercut.
All of these
 brushes should smoothly run in the holders.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 400 V.
 100 V.
 800 V.
 200 V.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 440 A.
 44 A.
 40 A.

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Electrical Machines
In alternator, the rotary part is

 core.
 none of these.
 armature.
  magnetic field poles.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Both torque and speed decrease.
 Torque and speed both increase.
 Torque decrease and speed increases.
  Torque increase and speed decrease.

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MORE MCQ ON Electrical Machines

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