Fuels and Combustion MCQs

Question 1

Cannel coal

Accepted Answer

All of the above

Answer

Is non-coking

Answer

Has a high volatile matter content and burns with a luminous smoky flame

Answer

Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named

Question 2

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

Accepted Answer

Cuprous chloride

Answer

Potassium hydroxide

Answer

Alkaline pyrogallol solution

Answer

None of these

Question 3

Low temperature carbonisation of coal produces

Accepted Answer

Soft coke

Answer

Metallurgical coke

Answer

Very low calorific value coke oven gas

Answer

No by-products

Question 4

High temperature carbonisation of coal produces

Accepted Answer

None of these

Answer

Inferior coke compared to low temperature carbonisation

Answer

Less of gases compared to liquid products

Answer

Large quantity of tar compared to low temperature carbonisation

Question 5

Fuel combustion is never cent per cent efficient due to

Accepted Answer

All of the above

Answer

Incomplete combustion

Answer

Dry gas/stack gas loss

Answer

Moisture loss

Question 6

Coal is pulverised before burning in large capacity boiler furnaces mainly to

Accepted Answer

Ensure its complete combustion

Answer

Facilitate easy ash removal

Answer

Enhance its calorific value

Answer

Provide trouble free operation

Question 7

Spontaneous combustion of coal on storage results due to

Accepted Answer

All of the above

Answer

Inadequate ventilation

Answer

Low temperature oxidation

Answer

Storage in large heaps with small surface to volume ratio

Question 8

Coalification means the

Accepted Answer

Process of conversion of lignite into anthracite

Answer

Underground gasification of coal

Answer

Complete combustion of coal

Answer

Direct hydrogenation of coal

Question 9

Coking coals are invariably

Accepted Answer

Bituminous coals

Answer

Lignites

Answer

Semi-anthracites

Answer

Anthracites