Brushes of D.C. machines are made of_________?
A. Carbon
B. Soft copper
C. Hard copper
D. All of above
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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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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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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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Laminations of core are generally made of________________?
A. Case iron
B. Carbon
C. Silicon steel
D. Stainless steel
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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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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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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 field coils of D.C. generator are usually made of_____________?
A. Mica
B. Copper
C. Cast iron
D. Carbon
Read more about this MCQ
Word of the Day
01 Sep
Adhere
stick fast to (a surface or substance).
پیوستہ ہونا، لگا ہوا ہونا، چپکا ہوا ہونا

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