FUELS AND COMBUSTION QUIZ

Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as

M = 0.5 A

M = 1.8 A

M = 1.1 A

M = A

TRUE ANSWER : ?
YOUR ANSWER : ?

As time passes, the calorific value of stored coal

Decreases

Increases

Remains unaltered

May increase or decrease (depends on the method of storage)

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal having higher volatile matter content, has lower

Smoking tendency on burning

Coke oven gas yield on carbonisation

Chance of catching fire during storage in open space

Ignition temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

Abrasion index of blast furnace coke should be around __________ percent.

20

80

35

55

TRUE ANSWER : ?
YOUR ANSWER : ?

Naphthalene recovered from coke oven gas is used

As a fuel in furnaces

For making electrodes

As moth balls (insecticides)

As moisture proof coating on fibres

TRUE ANSWER : ?
YOUR ANSWER : ?

Percentage of nitrogen in blast furnace gas may be around

80

5

55

25

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.

All of these

Unsaturated hydrocarbons

Hydrogen

Methane

TRUE ANSWER : ?
YOUR ANSWER : ?

The reaction, C + CO₂ ⟷ 2CO, taking place during coal gasification is called the __________ reaction. n.

Boudouard

Shift conversion

Reduction

Neumann reversal

TRUE ANSWER : ?
YOUR ANSWER : ?

Critical Air Blast (CAB) value of coke is a direct measure of its

Hardness

Reactivity

None of these

Strength

TRUE ANSWER : ?
YOUR ANSWER : ?

Coalification means the

Process of conversion of lignite into anthracite

Direct hydrogenation of coal

Underground gasification of coal

Complete combustion of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

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