Computer Programming MCQs

5739 MCQs  (Page 58 of 574)

Attempt Computer Programming MCQs Quiz
In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except______________?
A. Interpoles
B. Dummy coils
C. Compensating winding
D. Shifting of axis of brushes
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In D.C. generators on no-load, the air gap flux distribution in space is______________?
A. Sinusoidal
B. Triangular
C. Pulsating
D. Flat topped
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The purpose of providing dummy coils in a generator is____________?
A. To reduce eddy current losses
B. To enhance flux density
C. To amplify voltage
D. To provide mechanical balance for the rotor
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A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly_______________?
A. 150 v
B. 175 v
C. 240 v
D. 290 v
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The purpose of providing dummy coils in a generator is__________________?
A. To reduce eddy current losses
B. To enhance flux density
C. To amplify voltage
D. To provide mechanical balance for the rotor
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Which generator would you prefer for feeding long D.C. transmission lines ?
A. Series generator
B. Shunt generator
C. Over compound generator
D. Flat compound generator
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In a D.C. generator the critical resistance can be increased by_____________?
A. Increasing its field resistance
B. Decreasing its field resistance
C. Increasing its speed
D. Decreasing its speed
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The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is______________?
A. 2
B. 4
C. 6
D. 8
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For both lap and wave windings, there are as many commutator bars as the number of_____________?
A. Slots
B. Armature conductors
C. Winding elements
D. Poles
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The series field of a short-shunt D.C. generator is excited by_______________?
A. External current
B. Armature current
C. Shunt current
D. Load current
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Word of the Day
14 Jul
Obscenity
the state or quality of being obscene.
بےہودگی، فحاشی، بے شرمی

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