Computer Programming MCQs

5739 MCQs  (Page 54 of 574)

Attempt Computer Programming MCQs Quiz
If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by______________?
A. Blv
B. Blv2
C. Bl2v
D. Bl2v2
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In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be__________________?
A. 4
B. 8
C. 16
D. 32
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The material for commutator brushes is generally_______________?
A. Mica
B. Copper
C. Cast iron
D. Carbon
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The insulating material used between the commutator segments is normally_____________?
A. Graphite
B. Paper
C. Mica
D. Insulating varnish
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In D.C. generators, the brushes on commutator remain in contact with conductors which_________________?
A. Lie under south pole
B. Lie under north pole
C. Lie under interpolar region
D. Are farthest from the poles
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If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be________________?
A. Demagnetisation only
B. Cross magnetisation as well as mag¬netisation
C. Crossmagnetisation as well as demagnetising
D. Cross magnetisation only
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Armature reaction of an unsaturated D.C. machine is_____________?
A. Crossmagnetising
B. Demagnetising
C. Magnetising
D. None of above
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D.C. generators are connected to the busbars or disconnected from them only under the floating condition________________?
A. To avoid sudden loading of the primemover
B. To avoid mechanicaljerk to the shaft
C. To avoid burning of switch contacts
D. All above
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Eddy currents are induced in the pole shoes of a D.C. machine due to______________?
A. Oscillating magnetic field
B. Pulsating magnetic flux
C. Relative rotation between field and armature
D. All above
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Equilizer rings are required in case armature is_______________?
A. Wave wound
B. Lap wound
C. Delta wound
D. Duplex wound
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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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