Computer Programming MCQs

5739 MCQs  (Page 43 of 574)

Attempt Computer Programming MCQs Quiz
In case of conductively compensated D.C. series motors, the compensating winding is provided______________?
A. As separately wound unit
B. In parallel with armature winding
C. In series with armature winding
D. In parallel with field winding
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Sparking at the commutator of a D.C. motor may result in____________?
A. Damage to commutator segments
B. Damage to commutator insulation
C. Increased power consumption
D. All of the above
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Which of the following motor is preferred for operation in highly explosive atmosphere ?
A. Series motor
B. Shunt motor
C. Air motor
D. Battery operated motor
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If the supply voltage for a D.C. motor is increased, which of the following will decrease ?
A. Starting torque
B. Operating speed
C. Full-load current
D. All of the above
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Which one of the following is not the function of pole shoes in a D.C. machine ?
A. To reduce eddy current loss
B. To support the field coils
C. To spread out flux for better uniformity
D. To reduce the reluctance of the magnetic path
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For which of the following applications a D.C. motor is preferred over an A.C. motor ?
A. Low speed operation
B. High speed operation
C. Variable speed operation
D. Fixed speed operation
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In D.C. machines the residual magnetism is of the order of_________________?
A. 2 to 3 per cent
B. 10 to 15 per cent
C. 20 to 25 per cent
D. 50 to 75 per cent
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Which D.C. motor is generally preferred for cranes and hoists ?
A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motor
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Three point starter can be used for______________?
A. Series motor only
B. Shunt motor only
C. Compound motor only
D. Both shunt and compound motor
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Sparking, is discouraged in a D.C. motor because_____________?
A. It increases the input power con-sumption
B. Commutator gets damaged
C. Both a. and b.
D. None of the above
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Word of the Day
12 Jul
Obdurate
stubbornly refusing to change one’s opinion or course of action.
ضدی، بدکار، سنگدلی

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