FUELS AND COMBUSTION QUIZ

Orsat apparatus is meant for

Finding out combustion efficiency

Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride

None of these

Gravimetric analysis of flue gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Desirable "Micum Index" values of metal-lurical coke are

M40 > 10% and M10 < 78%

M40 > 98% and M10 < 2%

M40 > 4% and M10 < 80%

M40 > 78% and M10 < 10%

TRUE ANSWER : ?
YOUR ANSWER : ?

Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.

15 to 25

55 to 75

75

35 to 45

TRUE ANSWER : ?
YOUR ANSWER : ?

Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.

Gasification

Carbonisation

None of these

Hydrogenation

TRUE ANSWER : ?
YOUR ANSWER : ?

Percentage of methane in coke oven gas may be around

25

15

5

50

TRUE ANSWER : ?
YOUR ANSWER : ?

Atomising steam to fuel oil ratio in a burner should be around

2.5

0.5

3.5

1.5

TRUE ANSWER : ?
YOUR ANSWER : ?

Undercharging of coal in the by-product coke ovens results in

Decrease in the c.v. of coke oven gas

No change in the c.v. of coke oven gas

Increase in the c.v. of coke oven gas

Increase in its throughput

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³.

3200

5400

10200

1800

TRUE ANSWER : ?
YOUR ANSWER : ?

Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

5000

10000

50

1000

TRUE ANSWER : ?
YOUR ANSWER : ?

Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.

10 & 20

3 & 10

15 & 8

10 & 3

TRUE ANSWER : ?
YOUR ANSWER : ?

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