Computer Programming MCQs

5739 MCQs  (Page 53 of 574)

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The resistance of armature winding depends on
A. Length of conductor
B. Cross-sectional area of the conductor
C. Number of conductors
D. All of the above
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The commutator segments are connected to the armature conductors by means of___________?
A. Copper lugs
B. Resistance wires
C. Insulation pads
D. Brazing
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Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ?
A. 0.005 mm
B. 0.05 mm
C. 0.5 m
D. 5 m
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Laminations of core are generally made of________________?
A. Case iron
B. Carbon
C. Silicon steel
D. Stainless steel
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The armature of D.C. generator is laminated to_______________?
A. Reduce the bulk
B. Provide the bulk
C. Insulate the core
D. Reduce eddy current loss
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Iron losses in a D.C. machine are independent of variations in_____________?
A. Speed
B. Load
C. Voltage
D. Speed and voltage
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Iron losses in a D.C. machine are independent of variations in______________?
A. Speed
B. Load
C. Voltage
D. Speed and voltage
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In D.C. generators, current to the external circuit from armature is given through_____________?
A. Commutator
B. Solid connection
C. Slip rings
D. None of above
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Brushes of D.C. machines are made of_________?
A. Carbon
B. Soft copper
C. Hard copper
D. All of above
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If a D.C. generator fails to build up the probable cause could not be_____________?
A. Imperfect brush contact
B. Field resistance less than the critical resistance
C. No residual magnetism in the generator
D. Faulty shunt connections tending to reduce the residual magnetism
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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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