FUELS AND COMBUSTION QUIZ

Which of the following would require least amount of secondary air for combustion?

Semi-bituminous coal containing 25% ash and 20% volatile matter

Anthracite containing 10% volatile matter and 8% ash

Coke breeze containing 25% ash and 2% volatile matter

Bituminous coal containing 20% ash and 25% volatile matter

TRUE ANSWER : ?
YOUR ANSWER : ?

The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm³.

5000

15, 000

10, 000

25, 000

TRUE ANSWER : ?
YOUR ANSWER : ?

Height of coke oven is limited (say maximum upto 7 metres) mainly by the

Buckling of ram of pusher car at the time of coke pushing

Structural strength of silica bricks

Problem in door cleaning

Problem of uniform heating along its height

TRUE ANSWER : ?
YOUR ANSWER : ?

Coalification means the

Complete combustion of coal

Direct hydrogenation of coal

Underground gasification of coal

Process of conversion of lignite into anthracite

TRUE ANSWER : ?
YOUR ANSWER : ?

In high temperature carbonisation (as compared to low temperature carbonisation) of coal

All of these

Tar yield is less but free carbon in tar is more

Calorific value of coke oven gas is less

Coke oven gas yield is more

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a product of tar distillation?

Phenol & naphthalene

None of these

Benzol & pitch

Anthracene & creosote

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of furnace oil is about __________ Kcal/kg.

20000

5000

10000

15000

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always

Unpredictable

< 1

> 1

1

TRUE ANSWER : ?
YOUR ANSWER : ?

Fuel consumption in coke making can be reduced by

Dry quenching of coke

Stamped charging of coal

Preheating, blending and de-ashing the coal

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

0.5

2.5

20

10

TRUE ANSWER : ?
YOUR ANSWER : ?

↑