Computer Programming MCQs

5739 MCQs  (Page 257 of 574)

Attempt Computer Programming MCQs Quiz
On which of the following variables heat convected depends ?
A. power density
B. temperature difference between heated surface and coolant
C. thermal resistivity, density, specific heat
D. gravitational constant
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The mcrease in heat dissipation by air blasts is due to increase in______________?
A. Conduction
B. Convection
E. Radiation
D. Any ofthe above
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Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto_______________?
A. 10 mw
B. 30 mw
C. 60 mw
D. 150 mw
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Hydrogen has a heat transfer co-efficient __________ times that of air?
A. 1.5
B. 2.5
C. 3.5
D. 4.5
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With conventional hydrogen cooling it is possible to increase the rating of a single unit to___________?
A. 50 mw
B. 100 mw
C. 200 mw
D. None of the above
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cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall______________?
A. Direct
B. Indirect
C. Conventional
D. Any of the above
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The thermal conductivity of hydrogen is _____________ times that of air?
A. 2
B. 3
C. 5
D. 7
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The noise produced by a ___________ cooled machine is less as the rotor moves in a medium of smaller density?
A. Air
B. Hydrogen
C. Either a. or b.
D. None of the above
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The heated parts of an electrical machine dissipate heat into their surroundings by which of the following modes of heat dissipation ?
A. Conduction
B. Convection
C. Radiation
D. All of the above
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Which of the following is an advantage of hydrogen cooling ?
A. increase in efficiency
B. increase in ratings
C. increase in life
D. smaller size of coolers
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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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