FUELS AND COMBUSTION QUIZ

__________ present in coal is not determined in its ultimate analysis.

Fixed carbon

Nitrogen

Hydrogen

Total carbon

TRUE ANSWER : ?
YOUR ANSWER : ?

Fossil fuels mean

Those fuels which are found in the crust of earth

Liquid fuels

Solid fuels

Premature fuels with low calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

A travelling grate stoker is meant for the efficient burning of __________ coal.

Non-caking

Pulverised

Caking

High ash

TRUE ANSWER : ?
YOUR ANSWER : ?

Too much of excess air in combustion results in high

Percentage of oxygen in flue gases

All of these

Fuel consumption for the same heat load

Stack gas temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

Ratio of primary air to secondary air increases with increase in the rank of coal, because the

High rank coals have higher amount of volatile matter

Ratio of fixed carbon to volatile matter increases

Oxygen content progressively decreases

Calorific value of the coal increases

TRUE ANSWER : ?
YOUR ANSWER : ?

Steam is intermittently admitted into the fuel bed during the production of producer gas to

Convert CO to CO₂

Minimise the chances of clinker formation

Increase the gas production rate

Increase the combustion rate

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is the most matured coal?

Lignite

Semi-anthracite

Bituminous

Anthracite

TRUE ANSWER : ?
YOUR ANSWER : ?

Gobar gas is produced by the __________ of cown dung.

Hydrogenation

Fermentation

Oxidation

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?

50

70

100

85

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of

Light paraffinic fuel oils is higher than that of equivalent olefins

Light paraffinic fuel oils is lower than that of equivalent olefins

Light paraffinic fuel oils is equal to that of equivalent olefins

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

TRUE ANSWER : ?
YOUR ANSWER : ?