Chemical Engineering MCQs

Page No. 284

Which of the following accounts for maximum energy loss in a boiler ?


aFlue gases

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bAsh content in the fuel

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cIncomplete combustion

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dUnburnt carbon in flue gases

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View Answer Flue gases

Naphthalene is used for making_________________?


aInsecticides (e.g. moth balls)

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bUnsaturated polyesters

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cDrug intermediates e.g. β-naphthol

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dAll A., B. and C.

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View Answer All A., B. and C.

Dry air requirement for burning 1 Nm3 of CO to CO2 may be around _______________ Nm3 ?


a2.4

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b1.75

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c0.87

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d11.4

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View Answer 2.4

In flue gas analysis by Orsat’s apparatus, oxygen is absorbed by____________________?


aPotassium hydroxide

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bCuprous chloride

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cAlkaline pyrogallol solution

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dNone of these

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Blast furnace coke is made from coal by_____________________?


aLow temperature carbonisation

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bHigh temperature carbonisation

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cMedium temperature carbonisation

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dHeating the coal in an oven in presence of air

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For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will_____________________?


aIncrease

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bDecrease

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cIncrease or decrease depending on the fuel type

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dNot change

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View Answer Decrease

Low temperature carbonisation of coal produces_________________?


aMetallurgical coke

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bSoft coke

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cVery low calorific value coke oven gas

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dNo by-products

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View Answer Soft coke

Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around ______________ cm/hr?


a2.5

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b0.5

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c10

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d20

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View Answer 2.5

A coal having higher volatile matter content will necessarily have lower____________________?


aAsh fusion temperature

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bCalorific value

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cIgnition temperature

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dCaking index

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View Answer Ignition temperature

Function of secondary air in pulverised coal firing is to_________________?


aTransport the coal to the burner

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bDry the coal

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cEnsure efficient burning of coal around the burner

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dReduce primary air requirement

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