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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 speed.
 current.
 power.
 torque.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Shunt motor.
 Series motor.
 Cummulative compound motor.
 Differential compound motor.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 cant be determined.
 266.20 N-m.
 133.22 N-m
 234.76 N-m.

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 50 Ω
 10 Ω
 0.1 Ω
 100 Ω

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Electrical Machines
Hysteresis loop represents the area of

 hysteresis loss
 eddy current loss
 copper loss
 total iron losses

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic neutral armature co-ordinate.
 Magnetically no-load armature co-ordinate.
  Magnetic neutral axis.
 Magnetic no-load axis.

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MORE MCQ ON Electrical Machines

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