Chemical Engineering MCQs

6108 MCQs  (Page 67 of 611)

Attempt Chemical Engineering Quiz
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is_________________?
A. 130
B. 180
C. 230
D. 250
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The critical pressure at which the latent heat of vaporization of steam becomes zero is _____________ Kg/cm2 ?
A. 273.15
B. 225.65
C. 100.03
D. 373.15
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For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ?
A. Propane and acetylene
B. Propane and lpg
C. Sewage gas and gobar gas
D. B.f gas and coke oven gas
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What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively ?
A. 2
B. 8
C. 10
D. 40
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In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be________________?
A. Higher, as it gives higher wavelength
B. Lower, as it gives higher wavelength
C. Higher, as it gives shorter wavelength
D. Lower, as it gives shorter wavelength
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A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is ________________ W/m2 °C ?
A. 50
B. 100
C. 150
D. 200
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The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the _______________ allowance ?
A. Casting
B. Pattern
C. Draft
D. Distortion
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_______________ is the most important element, which controls the physical properties of steel ?
A. Manganese
B. Silicon
C. Carbon
D. Vanadium
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________________ is the hardest material out of the following ?
A. Boron carbide
B. Tungsten carbide
C. Hardened steel
D. Silicon carbide
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Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution ?
A. A1 is more alkaline than solution a2
B. A1 is highly acidic
C. A2 is very slightly acidic
D. Both b. & c.
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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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