Chemical Engineering MCQs

Page No. 252

In isotropic turbulence, the _____________ are equal to each other?


aTemporal velocity components

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bMean square of velocity fluctuations in the three co-ordinate directions

✓


cRoot mean square of velocity fluctuations in the three co-ordinate directions

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dNone of these

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Purpose of relief valve in a reciprocating pump is to___________________?


aProtect the pump against developing excessive pressure

✓


bFacilitate unidirectional flow of liquid

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cReduce the discharge pressure

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dControl the rate of discharge

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Stoke’s equation is valid in the Reynolds number range__________________?


a0.01 to 0.1

✓


b0.1 to 2

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c2 to 10

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d10 to 100

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View Answer 0.01 to 0.1

Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?


aSilicon carbide

✓


bSilicon nitride

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cCrystalline magnesia

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dZirconium sulphate

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View Answer Silicon carbide

Permeability of bricks is a measure of the_________________?


aRefractoriness

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bMelting point

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cRate at which a fluid will pass through the pores

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dExpansion during heating

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Fireclay bricks are not used in the_____________________?


aBlast furnace

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bHot blast stove

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cCupola

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dWall of coke oven

✓


View Answer Wall of coke oven

Which form of silica has the highest specific gravity ?


aQuartz

✓


bCristobalite

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cTridymite

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dAll have the same specific gravity

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View Answer Quartz

Thermal conductivity of refractory bricks_________________?


aIncreases with decrease in porosity

✓


bDecreases with decreases in porosity

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cIs independent of its porosity and is maximum for insulating bricks

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dIncreases with the amount of air entrapped in pores

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Fusion point of a basic refractory material is__________________?


aReduced by the addition of acid oxides

✓


bIncreased by the addition of acid oxides

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cNot affected by the addition of acid oxides

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dAlways less than 1000°C

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Fireclay bricks are used in the__________________?


aCoke ovens regenerator

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bOuter lining of L.D. converter

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cHearth bottom of blast furnace

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dCoke oven walls

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