FUELS AND COMBUSTION QUIZ

Softening temperature of coal ash is a measure of the __________ of coal.

Caking tendency

Coking tendency

Size stability

Clinkering tendency

TRUE ANSWER : ?
YOUR ANSWER : ?

Carbon Content by weight in air dried wood may be about __________ percent.

10

50

25

80

TRUE ANSWER : ?
YOUR ANSWER : ?

Stack (chimney) height in a big thermal power plant is dictated by the

None of these

Pollution control aspect

Limitation of constructional facilities

Draught to be created

TRUE ANSWER : ?
YOUR ANSWER : ?

The fuel ratio of a coal is

Both A and B

The ratio of its percentage of fixed carbon to that of volatile matter

Neither A nor B

Helpful in estimation of its rank

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following can be made into briquettes without the use of a binder?

Anthracite coal

Bituminous coal

Lignite

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Largest constituent of coke oven gas is

N₂

H₂

CO₂

CH₄

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal that softens and fuses on heating is

Classified

Caking

Carbonised

Non-caking

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

None of these

Requires smaller combustion space and less secondary air

Is less liable to spontaneous combustion on storage

Is more difficult to ignite and produces a shorter flame

TRUE ANSWER : ?
YOUR ANSWER : ?

Use of preheated air for combustion of fuel in the furnace, increases the

None of these

Calorific value of the fuel

Flame temperature

Scale losses of the furnace stock

TRUE ANSWER : ?
YOUR ANSWER : ?

In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by

Dilute potassium carbonate

Potassium hydroxide

Alkaline pyragllol solution

Cuporus chloride

TRUE ANSWER : ?
YOUR ANSWER : ?