Chemical Engineering MCQs

Page No. 778

Cassiterite is an ore of_________________?


aTin


bLead


cMolybdenum


dChromium


View Answer Tin

Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution ?


aA1 is more alkaline than solution A2


bA1 is highly acidic


cA2 is very slightly acidic


dBoth B. & C.


View Answer Both B. & C.

________________ is the hardest material out of the following ?


aBoron carbide


bTungsten carbide


cHardened steel


dSilicon carbide


View Answer Boron carbide

_______________ is the most important element, which controls the physical properties of steel ?


aManganese


bSilicon


cCarbon


dVanadium


View Answer Carbon

The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the _______________ allowance ?


aCasting


bPattern


cDraft


dDistortion


View Answer Draft

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 ?


a50


b100


c150


d200


View Answer 100

In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be________________?


aHigher, as it gives higher wavelength


bLower, as it gives higher wavelength


cHigher, as it gives shorter wavelength


dLower, as it gives shorter wavelength



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 ?


a2


b8


c10


d40


View Answer 2

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) ?


aPropane and acetylene


bPropane and LPG


cSewage gas and gobar gas


dB.F gas and coke oven gas



The critical pressure at which the latent heat of vaporization of steam becomes zero is _____________ Kg/cm2 ?


a273.15


b225.65


c100.03


d373.15


View Answer 225.65

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