Chemical Engineering MCQs

Page No. 418

The amount of Zn (atomic weight = 65) required to form 224 c.c. of H2 at N.T.P. on treatment with dilute H2SO4will be _____________ gm?


a0.065


b0.65


c6.5


d65


View Answer 0.65

The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 × __________?


a1026


b1026


c1020


d1019


View Answer 1020

‘Cox’ chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the_____________?


aTemperature vs. log (vapor pressure)


bVapor pressure vs. log (temperature)


cLog (temperature) vs. log (vapor pressure)


dVapor pressure vs. temperature



Dissolving a solute in a solvent does not change its________________?


aSpecific heat


bVapour pressure


cViscosity


dNone of these


View Answer None of these

In the reaction, Ca + 2H2O = Ca(OH)2 + H2; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water ? (Atomic weight of calcium = 40) ?


a4480


b2240


c1120


d0.4


View Answer 4480

Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of ______________ °C?


a770


b570


c270


d270


View Answer 270

Which property of refractories is the most important for top section of the blast furnace ?


aResistance to abrasion


bResistance to slag penetration


cStability of volume at high temperature


dResistance to corrosion by slag



An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?


aCork


bSaw dust


cSand


dChemically prepared foam


View Answer Sand

With increase in the alumina content, the refractoriness of high alumina refractories_________________?


aIncreases


bDecreases


cRemain same


dMay increase or decrease


View Answer Increases

Fireclay bricks are used in the______________?


aCoke ovens regenerator


bOuter lining of L.D. converter


cHearth bottom of blast furnace


dCoke oven walls



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