FUELS AND COMBUSTION QUIZ

A sooty flame can be made non-luminous by

Admitting more gas

Shutting gas supply

Admitting more air

Shutting air supply

TRUE ANSWER : ?
YOUR ANSWER : ?

Air/gas ratio for complete combustion will be the highest for

Coke oven gas

Gobar gas

Carburetted water gas

LPG

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.

Bomb

Boy's

None of these

Junker's

TRUE ANSWER : ?
YOUR ANSWER : ?

One kg of carbon for theoretically complete combustion requires __________ kg of air.

12

0.5

11.5

23

TRUE ANSWER : ?
YOUR ANSWER : ?

Combustion of pulverised fuel

Requires larger combustion chamber than rich gaseous fuel

Suppresses the discharge of fine dust and grit into atmosphere

All of these

In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following accounts for maximum energy loss in a boiler?

Ash content in the fuel

Incomplete combustion

Flue gases

Unburnt carbon in flue gases

TRUE ANSWER : ?
YOUR ANSWER : ?

Low temperature carbonisation of coal produces

Very low calorific value coke oven gas

Soft coke

No by-products

Metallurgical coke

TRUE ANSWER : ?
YOUR ANSWER : ?

Oxygen percentage (by weight) in atmospheric air is

21

19

29

23

TRUE ANSWER : ?
YOUR ANSWER : ?

Gross and net calorific value of a fuel will be the same

If its hydrogen/hydrogen compound content is zero

Ifits carbon content is very low

If its ash content is zero

Under no circumstances

TRUE ANSWER : ?
YOUR ANSWER : ?

Percentage of hydrogen in coke oven gas may be around

10

25

45

60

TRUE ANSWER : ?
YOUR ANSWER : ?