Computer Programming MCQs

5739 MCQs  (Page 262 of 574)

Attempt Computer Programming MCQs Quiz
In a D.C. machine the number of brush arms is _________ the number of poles?
A. Less than
B. Equal to
C. Greater than
D. None of the above
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Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
A. increased i r losses
B. increased core losses
C. poor commutation
D. change in motor parameters
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Which of the following brushes can be used for high values of current density ?
A. Metal graphite brushes
B. Hard carbon brushes
C. Electro-graphitic brushes
D. Natural graphite brushes
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is usually used for brush rockers____________?
A. Mild steel
B. Copper
C. Aluminium
D. Cast-iron
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The stator of a D.C. machine comprises of_____________?
A. Main poles
B. Interpoles
C. Frame
D. All of the above
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Which of the following in an application of D.C. motors?
A. traction
B. drives for process industry
C. battery driven vehicles
D. automatic control
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The cylindrical windings using circular conductors are used for current rating of____________?
A. Upto 20 a
B. Upto 40 a
C. Upto 60 a
D. Upto 80 a
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D.C. servomotors are used in______________?
A. Purely d.c. control systems
B. Purely ac. control systems
C. Both d.c. and ac. control systems
D. None of the above
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The laminations of the armature of a D.C. machine are usually ___________ thick?
A. 0.1 to 0.2 mm
B. 0.2 to 0.3 mm
C. 0.3 to 0.4 mm
D. 0.4 to 0.5 mm
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___________ brushes are fragile and cause excessive wear of commutator?
A. Natural graphite
B. Hard carbon
C. Electro graphitic
D. Metal graphite
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Word of the Day
24 Jul
Untenable
(especially of a position or view) not able to be maintained or defended against attack or objection.
ناقابل مدافعت، غیر مستحکم، جو دلیل سے ثابت نہ ہو سکے

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