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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?
Capacitor start capacitor run motor
Capacitor start motor
Resistance split phase motor
All of these
Capacitor start capacitor run motor
Capacitor start motor
Resistance split phase motor
All of these
Answer
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Related Question
Electrical Machines
Armature reaction in dc motor results
decrease in speed.
open circuit.
increase in speed.
short circuit.
decrease in speed.
open circuit.
increase in speed.
short circuit.
Answer
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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?
96%
92%
95%
94%
96%
92%
95%
94%
Answer
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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for
electromechanical energy conversion
generation of voltage
commutation
development of torque
electromechanical energy conversion
generation of voltage
commutation
development of torque
Answer
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Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will
deteriorate with rise in terminal voltage.
improve with rise in terminal voltage.
improve with fall of terminal voltage.
deteriorate with fall of terminal voltage.
deteriorate with rise in terminal voltage.
improve with rise in terminal voltage.
improve with fall of terminal voltage.
deteriorate with fall of terminal voltage.
Answer
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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce
vibrations.
copper loss.
eddy electric current loss.
hysteresis loss.
vibrations.
copper loss.
eddy electric current loss.
hysteresis loss.
Answer
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