FUELS AND COMBUSTION QUIZ

With increase in moisture content of coal, its

Bulk density always decreases

Calorific value increases sometimes

Clinkering tendency during combustion increases

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Junker's calorimeter is used to determine the calorific value of

Pulverised coal

Fuel oil

Gaseous fuels

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.

3 to 4

1 to 2

5 to 15

20 to 40

TRUE ANSWER : ?
YOUR ANSWER : ?

During its calorific value determination by bomb calorimeter, coal is combusted by

Air

None of these

Oxygen

Oxygen enriched air

TRUE ANSWER : ?
YOUR ANSWER : ?

For maximum discharge through a chimney, its height should be

Infinitely long

More than 105.7 metres

Equal to the height of the hot gas column producing draught

200 meters

TRUE ANSWER : ?
YOUR ANSWER : ?

Anthracite coal

Contains more volatile matter than bituminous coal

Burns with short, bluish, yellow-tipped flame producing very little smoke

Is essentially a coking coal

Ignites more easily than bituminous coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Fusion point of coal ash increases with increase in its __________ content.

Lime and magnesia

Iron sulphate

Iron silicate

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

A particular coal is said to be free burning when it

Shows little or no fusing action

None of these

Burns completely

Gives smokeless burning

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.

Oxygen

Carbon

Hydrogen

Sulphur

TRUE ANSWER : ?
YOUR ANSWER : ?

In low temperature carbonisation of coal, the

Volatile matter in coke is zero

Yield of tar is about 3% of dry coal

Yield of coke oven gas is 290 Nm³ /ton dry coal

Temperature maintained is 700°C

TRUE ANSWER : ?
YOUR ANSWER : ?