Fuels and Combustion MCQs

Question 1

Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.

Accepted Answer

Hydrogenation

Answer

Gasification

Answer

Carbonisation

Answer

None of these

Question 2

Largest constituent of coke oven gas is

Accepted Answer

H2

Answer

N2

Answer

CH4

Answer

CO2

Question 3

A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that

Accepted Answer

Complete combustion of fuel has taken place

Answer

21% excess air has been used for combustion

Answer

21% excess oxygen has been used for combustion

Answer

No excess air has been used for combustion

Question 4

Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.

Accepted Answer

750

Answer

500

Answer

950

Answer

1100

Question 5

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

Accepted Answer

Oxygen

Answer

Air

Answer

Oxygen enriched air

Answer

None of these

Question 6

Orsat apparatus

Accepted Answer

All of the above

Answer

Gives flue gas analysis on dry basis

Answer

Determines N2 in flue gas indirectly

Answer

Can't determine CO in flue gas, if it is < 0.2%

Question 7

Orsat apparatus is meant for

Accepted Answer

None of these

Answer

Gravimetric analysis of flue gas

Answer

Finding out combustion efficiency

Answer

Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride

Question 8

'Fat coals' are those coals which have very high

Accepted Answer

Caking capacity

Answer

Volatile matter content

Answer

Fusion point of its ash

Answer

Inherent moisture content

Question 9

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

Accepted Answer

Acetylene

Answer

Hydrogen

Answer

Carbon monoxide

Answer

Methane