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Electrical Machines
Which of the following represents the commutator pitch?
The distance between the staring of first coil and its next successive coil
Number of commutator segments between two successive coils.
Number of conductors spanned by one coil at the back end of the armature.
Number of conductors spanned by one coil at the front end of the armature.
The distance between the staring of first coil and its next successive coil
Number of commutator segments between two successive coils.
Number of conductors spanned by one coil at the back end of the armature.
Number of conductors spanned by one coil at the front end of the armature.
Answer
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Related Question
Electrical Machines
Why are capacitors used with large AC induction motor?
Improve power level.
Improve power factor.
Improve current level.
Improve voltage level.
Improve power level.
Improve power factor.
Improve current level.
Improve voltage level.
Answer
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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?
None of these
Bush bearings.
Cast iron bearings.
Ball bearings.
None of these
Bush bearings.
Cast iron bearings.
Ball bearings.
Answer
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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series
86.91 V.
66.91 V.
56.91 V.
76.91 V.
86.91 V.
66.91 V.
56.91 V.
76.91 V.
Answer
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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be
25 W.
36 W.
28 W.
30 W.
25 W.
36 W.
28 W.
30 W.
Answer
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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will
both increase
decrease and increase respectively
both decrease
increase and decrease respectively
both increase
decrease and increase respectively
both decrease
increase and decrease respectively
Answer
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