FUELS AND COMBUSTION QUIZ

Which of the following is not a by-product fuel?

Blast furnace gas

Petrol

Pitch

Refinery gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Volumetric ratio of N₂ to O₂ in dry atmospheric air is

3.76

4.76

0.21

0.79

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in calorific value of fuels, their adiabatic flame temperatures

Increase

Decrease

May increase or decrease ; depends on the quantity of products of combustion

Remain unchanged

TRUE ANSWER : ?
YOUR ANSWER : ?

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

0.5

10

20

2.5

TRUE ANSWER : ?
YOUR ANSWER : ?

In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.

Yield percentage of coke

Free carbon content in tar

Difference in gross & net calorific value of the coke oven gas

Yield of ammonia present in coke oven gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of free moisture in coal is most disadvantageous during

Handling (e.g. when emptying wagons)

Combustion of fire slacks on the grates

None of these

Its pulverisation (as it requires more power)

TRUE ANSWER : ?
YOUR ANSWER : ?

Naphthalene recovered from coke oven gas is used

As moisture proof coating on fibres

As moth balls (insecticides)

As a fuel in furnaces

For making electrodes

TRUE ANSWER : ?
YOUR ANSWER : ?

Washing of coal decreases its

Mineral matter content

Caking index

Both B and C

Ash content

TRUE ANSWER : ?
YOUR ANSWER : ?

'Wobbe index' is a characteristic of

Gaseous fuels

Solid fuels

Fat coals

Liquid fuels

TRUE ANSWER : ?
YOUR ANSWER : ?

Ammonia content in raw coke oven gas is about __________ gm/Nm³.

50

15

100

1

TRUE ANSWER : ?
YOUR ANSWER : ?

↑