FUELS AND COMBUSTION QUIZ

Grindability index of a coal is 100. It implies that the

Power consumption in grinding the coal will be very high

Coal can't be pulverised

Coal can be pulverised with great difficulty

Coal can be easily pulverised

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Caking tendency

Clinkering tendency

Size stability

Coking tendency

TRUE ANSWER : ?
YOUR ANSWER : ?

Combustion of pulverised fuel

Suppresses the discharge of fine dust and grit into atmosphere

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

Requires larger combustion chamber than rich gaseous fuel

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The most matured coal out of the following is

Sub-bituminous

Semi-anthracite

Bituminous

Lignite

TRUE ANSWER : ?
YOUR ANSWER : ?

Most of the coking coals are

Lignite

Bituminous

None of these

Anthracite

TRUE ANSWER : ?
YOUR ANSWER : ?

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

There are chances of explosion during preheating

It reduces its calorific value tremendously

It reduces its flame temperature tremendously

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

TRUE ANSWER : ?
YOUR ANSWER : ?

Preheating of a gaseous fuel results in increased

Flame temperature

Quantity of flue gas

Flame length

Ignition temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

Compound coke ovens are those which can be heated by

Lean gas (e.g., B.F. gas)

Rich gas (e.g., coke oven gas)

Both B and C

Both steam and electrical power

TRUE ANSWER : ?
YOUR ANSWER : ?

Shatter index of the coke is a measure of its

Strength

None of these

Reactivity

Bulk density

TRUE ANSWER : ?
YOUR ANSWER : ?

Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

10000

1000

50

5000

TRUE ANSWER : ?
YOUR ANSWER : ?