Fuels and Combustion MCQs

Question 1

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

Accepted Answer

Oxygen

Answer

Sulphur

Answer

Hydrogen

Answer

Carbon

Question 2

Insitu theory and drift theory are related to the

Accepted Answer

Origin of coal

Answer

Origin of petroleum oil

Answer

Coalification

Answer

Variation of coal quality with depth

Question 3

During the carbonisation of coal

Accepted Answer

All of the above

Answer

All tar is evolved at < 600°C

Answer

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

Answer

Hard semi-coke starts shrinking at 600°C

Question 4

Ultimate analysis of coal determines its __________ content.

Accepted Answer

Carbon, hydrogen, nitrogen & sulphur

Answer

Carbon, ash, sulphur & nitrogen

Answer

Carbon, sulphur, volatile matter & ash

Answer

Carbon, volatile matter, ash & moisture

Question 5

Proximate analysis of coal determines its __________ content.

Accepted Answer

Moisture, volatile matter, ash & fixed carbon

Answer

Moisture, ash, sulphur & volatile matter

Answer

Moisture, sulphur, nitrogen & fixed carbon

Answer

None of these

Question 6

Which of the following is not a micro component present in coal?

Accepted Answer

Clarain

Answer

Micrinite

Answer

Fusinite

Answer

Liptinite

Question 7

Narrow coke ovens as compared to wider coke ovens

Accepted Answer

All of the above

Answer

Produce smaller coke

Answer

Produce stronger coke

Answer

Require less time of carbonisation

Question 8

With increases in carbonisation temperature

Accepted Answer

Coke even gas yield increases

Answer

Tar yield increases

Answer

Hydrogen percentage in the coke oven gas decreases

Answer

Methane percentage in the coke oven gas increases

Question 9

Coke ovens in steel plant are heated by

Accepted Answer

Both B & C

Answer

Electricity

Answer

Coke oven gas

Answer

Mixed gas