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

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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

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cStability of volume at high temperature

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dResistance to corrosion by slag

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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

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View Answer Sand

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


aIncreases

✓


bDecreases

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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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