FUELS AND COMBUSTION QUIZ

Coalification means the

Process of conversion of lignite into anthracite

Direct hydrogenation of coal

Complete combustion of coal

Underground gasification of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at

Singreni (AP.)

Dankuni (West Bengal)

Dhanbad

Raniganj

TRUE ANSWER : ?
YOUR ANSWER : ?

Narrow coke ovens as compared to wider coke ovens

Produce stronger coke

Produce smaller coke

All of these

Require less time of carbonisation

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not applicable to fluidised bed combustion of coal?

Less heat transfer surface area is required in boilers

None of these

It achieves higher fuel combustion efficiency

It can not burn low grade coal

TRUE ANSWER : ?
YOUR ANSWER : ?

If oxygen content in the flue gas rises too high, fuel is being wasted by

None of these

Incomplete combustion

Dry gas/stack gas loss

Moisture loss

TRUE ANSWER : ?
YOUR ANSWER : ?

If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be

Low

High

None of these

Very high, if the fuel is of low calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

During the carbonisation of coal

Evolution of H₂ and formation of methane and aromatics occur at > 700°C

All tar is evolved at < 600°C

All of these

Hard semi-coke starts shrinking at 600°C

TRUE ANSWER : ?
YOUR ANSWER : ?

For every 10% increase in the excess air; the fuel consumption increases by __________ percent.

5

2

0.1

10

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.

5 to 15

3 to 4

20 to 40

1 to 2

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ has the widest inflammability limit (explosion limit) of all the gases.

Methane

Hydrogen

Carbon monoxide

Acetylene

TRUE ANSWER : ?
YOUR ANSWER : ?

↑