Computer Programming MCQs

5739 MCQs  (Page 81 of 574)

Attempt Computer Programming MCQs Quiz
The rotor copper losses, in a synchronous motor, are met by____________?
A. D.c. source
B. Armature input
C. Motor input
D. Supply lines
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The standard full-load power factor ratings for synchronous motors are___________?
A. Zero or 0.8 leading
B. Unity or 0.8 lagging
C. Unity or 0.8 leading
D. Unity or zero
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A synchronous motor working at leading power factor can be used as____________?
A. Voltage booster
B. Phase advancer
C. Nosie generator
D. Mechanical synchronizer
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Slip-rings in a synchronous motor carry____________?
A. Direct current
B. Alternating current
C. No current
D. All of the above
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The angle between the rotating stator flux and rotor poles is called _________ angle.
A. Synchronizing
B. Obtuse
C. Torque
D. Power factor
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An important advantage of a synchronous motor over wound round induction motor is that
A. Its power factor may be varied at will
B. Its speed is independent of supply frequency
C. Its speed may be controlled more easily
D. None of the above
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The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?
A. Zero degree
B. Two degrees
C. Five degrees
D. Ten degrees
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Change of D.C. excitation of a synchronous motor changes:
A. Applied voltage of the motor
B. Power factor of power drawn by the motor
C. Motor speed
D. None of the these
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If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor__________?
A. Become more
B. Become less
C. Remain constant
D. None of the above
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When a 3-phase synchronous generator is supplying a zero power factor lagging load, the armature field affects the main field in the following way
A. Augments it directly
B. Directly opposes it
C. Cross-magnetises it
D. None of the above
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Word of the Day
15 Jul
Iterate
perform or utter repeatedly.
دہرانا، چکر

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