Computer Programming MCQs

5739 MCQs  (Page 84 of 574)

Attempt Computer Programming MCQs Quiz
While starting a synchronous motor by induction motor action, field winding is usually_____________?
A. Connected to d.c. supply
B. Short-circuited by low resistance
C. Kept open-circuited
D. None of the above
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When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop_________________?
A. Inductor motor torque
B. Induction generator torque
C. Synchronous motor torque
D. c. motor toque
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The armature current of the synchronous motor has higher values for_____________?
A. High excitation only
B. Low excitation only
C. Both a. and (b)
D. None of the above
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The efficiency of a properly designed synchronous motor will usually fall in range___________?
A. 60 to 70%
B. 75 to 80%
C. 85 to 95%
D. 99 to 99.5%
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A synchronous motor running with normal excitation adjusts to load increases essentially by increase in______________?
A. Back e.m.f.
B. Armature current
C. Power factor
D. Torque angle
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In which of the following motors the stator and rotor magnetic field rotate at the same speed?
A. Universal motor
B. Synchronous motor
C. Induction motor
D. Reluctance motor
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The maximum power developed in a synchronous motor occurs at a coupling angle of____________?
A. 30°
B. 60°
C. 90°
D. 180°
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The operating speed of a synchronous motor can be changed to new fixed value by___________?
A. Changing the load
B. Changing the supply voltage
C. Changing frequency
D. Using brakes
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The shaft of synchronous motor is made of____________?
A. Mild steel
B. Chrome steel
C. Alnico
D. Stainless steel
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A synchronous motor can be made self starting by providing?
A. Damper winding on rotor poles
B. Damper winding on stator
C. Damper winding on stator as well as rotor poles
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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