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Electrical Machines

Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 150Hz.
 100Hz.
 50Hz.
 200Hz.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Centrifugal pumps.
 Air compressors.
  Conveyers.
 Blowers.

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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°.
 45°.
 24°.
  10°.

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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 commutation.
 generation of voltage.
 electromechanical energy conversion.
 development of torque.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 440 A.
 340 A.
 570 A.
 250 A.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply voltage
 rotor resistance
 supply frequency
None of these

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MORE MCQ ON Electrical Machines

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