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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be
C - A - B.
B - C - A or C - A - B.
B - C - A.
A - C - B.
C - A - B.
B - C - A or C - A - B.
B - C - A.
A - C - B.
Answer
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Related Question
Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?
6
1
4
2
6
1
4
2
Answer
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Electrical Machines
In a 3 - Φ induction motor
power factor at starting is high as compared to that while running.
none of them.
power factor at starting is low as compared to that while running.
power factor at starting in the same as that while running.
power factor at starting is high as compared to that while running.
none of them.
power factor at starting is low as compared to that while running.
power factor at starting in the same as that while running.
Answer
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Electrical Machines
Which of the following statements is/are correct ?
None of these
Compensating winding will act under the pole.
Inter pole winding will act in interpolar region.
Both A and B.
None of these
Compensating winding will act under the pole.
Inter pole winding will act in interpolar region.
Both A and B.
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
development of torque
commutation
electromechanical energy conversion
generation of voltage
development of torque
commutation
Answer
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Electrical Machines
stepped cores are used in transformers in order to reduce
reluctance of core.
volume of copper.
volume of iron.
iron loss.
reluctance of core.
volume of copper.
volume of iron.
iron loss.
Answer
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