Chemical Engineering MCQs

6108 MCQs  (Page 32 of 611)

Attempt Chemical Engineering Quiz
Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of ?
A. Grashoff number
B. Grashoff number & reynolds number
C. Reynolds number
D. Grashoff number & prandtl number
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Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?
A. Emissivity of pipe surface
B. Diameter & length of the pipe
C. Temperature of hot pipe surface & that of air in the room
D. None of these
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Ammonia leakage in the refrigeration system is detected by_________________?
A. Sulphur stick, which on detection gives white smoke
B. Using chemical reagents
C. Its smell
D. Soap solution
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Blast furnace slag is mainly molten_________________?
A. Sand
B. Magnesium silicate
C. Calcium silicate
D. Iron pyrite
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The best lubricants for a machine working at high temperature & load is_________________?
A. Grease
B. Solid lubricant
C. Animal oils
D. Mineral oils
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A high pressure boiler generates steam at a pressure greater than _____________________ kg/cm2 ?
A. 10
B. 30
C. 50
D. 80
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Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is ______________ Nm3 ?
A. 0.5
B. 1
C. 1/3
D. 2.5
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Titanium is added to molten aluminium alloys before casting for the purpose of_____________________?
A. Grain refinement
B. Increasing corrosion resistance
C. Reducing porosity
D. Improving fluidity
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Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as_________________?
A. Gr0.25, gr
B. Gr0.25, gr0.33
C. Gr, gr0.25
D. Gr0.33, gr0.25
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Angular displacement can be measured suitably by a______________________?
A. Shaft encoder
B. Linear variable differential transducer (lvdt)
C. Stroboscope
D. Tachometer
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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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