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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.512.
 0.649.
 0.443.
  0.573.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase gradually and then stay at rated voltage
 increase to rated voltage and then may decrease
 decrease
 remain nearly constant

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Operating speed.
 Starting torque.
 Starting torque, operating speed, full load current.
  Full load current.

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Electrical Machines
The output power of any electrical motor is taken from the

 Field.
 Coupling mounted on the shaft.
 Armature.
 Motor frame.

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 30°.
 24°.
 45°.
  10°.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Field control.
 Field diverter control.
 Armature resistance control.
 Armature voltage control.

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