FUELS AND COMBUSTION QUIZ

Coke having higher porosity has

Higher reactivity

Lower strength

Lower bulk density

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to

Avoid radiation heat loss

None of these

Minimise its corrosion

Make it look attractive

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is used for making the explosive 'TNT'?

Pyridine

Cerosote

Toluene

Benzol

TRUE ANSWER : ?
YOUR ANSWER : ?

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

75

35 to 45

55 to 75

15 to 25

TRUE ANSWER : ?
YOUR ANSWER : ?

Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

It reduces its calorific value tremendously

There are chances of explosion during preheating

It reduces its flame temperature tremendously

The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the most poisonous gas?

Blast furnace gas

Coke oven gas

Producer gas

L.D. converter gas

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Absorption in wash oil

Adsorption on silica gel

Bubbling it through dilute sulphuric acid

Adsorption on bog iron bed

TRUE ANSWER : ?
YOUR ANSWER : ?

Fussain

Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation

Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal

All of these

Is friable, charcoal like substance

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of

Light paraffinic fuel oils is lower than that of equivalent olefins

Light paraffinic fuel oils is higher than that of equivalent olefins

N-paraffin is lower than that of iso-paraffins of the same compounds

Light paraffinic fuel oils is equal to that of equivalent olefins

TRUE ANSWER : ?
YOUR ANSWER : ?

Turndown ratio of a gas burner is equal to the

Both A & B

Maximum to minimum permissible gas flow rate

Minimum to maximum heat input ratio

Maximum to minimum heat input ratio

TRUE ANSWER : ?
YOUR ANSWER : ?