FUELS AND COMBUSTION QUIZ

Which of the following fuels is generally not used in thermal power plant boiler firing?

Furnace oil, light diesel oil and tar/PCM

Coal middling from washeries

F. gas, coke oven gas and L.D. converter gas

Pulverised coking coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Coke oven gas compared to blast furnace gas is

Lighter

Less poisonous

All of these

More explosive and inflammable

TRUE ANSWER : ?
YOUR ANSWER : ?

Purity of coke means that, it is high in carbon and low in

Ash

Volatiles

Iron

Moisture

TRUE ANSWER : ?
YOUR ANSWER : ?

Coal tar fuel - 200 (CTF 200) is a mixture of

Light oil and pitch

Anthracene and crecosote oil

Pitch and creosote oil

Solar oil and pitch

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Calorific value of coke oven gas is less

Tar yield is less but free carbon in tar is more

Coke oven gas yield is more

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm³.

4000

6500

2500

10000

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following gaseous fuels has the lowest calorific value?

Converter gas

Refinery gas

Blast furnace gas

Gobar gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Main constituent of natural gas is

C₃H₈

C₂H₆

H₂

CH₄ (upto 90%)

TRUE ANSWER : ?
YOUR ANSWER : ?

Coke oven gas is stripped of its H₂S and mercaptans content by

Adsorption on silica gel

Absorption in wash oil

Bubbling it through dilute sulphuric acid

Adsorption on bog iron bed

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of free moisture in coal during its high temperature carbonisation

Reduces the coking time

Increases the loss of fine coal dust from the ovens when charging

None of these

Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls

TRUE ANSWER : ?
YOUR ANSWER : ?

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