Fuels and Combustion MCQs

Question 1

Which of the following has the highest heat of combustion?

Accepted Answer

C2H6

Answer

H2

Answer

CO

Answer

CH4

Question 2

Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?

Accepted Answer

2CO ⟷ C + CO2

Answer

CO + H2O ⟷ CO2 + H2

Answer

C + H2O ⟷ CO + H2

Answer

C + 2H2O ⟷ CO2 + 2H2

Question 3

Overfire burning in a furnace is a phenomenon characterised by the

Accepted Answer

Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air

Answer

Supply of excess fuel

Answer

Supply of excess air

Answer

None of these

Question 4

Which of the following has the highest theoretical flame temperature ?

Accepted Answer

Acetylene

Answer

Blast furnace gas

Answer

Hydrogen

Answer

Coke oven gas

Question 5

Fischer-Tropsch method aims at the

Accepted Answer

Synthesis of gasoline (from water gas)

Answer

Gasification of coal

Answer

Hydrogenation of coal to produce gasoline

Answer

None of these

Question 6

The liquid used for the washing of coal in an industrial coal washery is a mixture of water and

Accepted Answer

Sand (40%)

Answer

Carbon tetrachloride

Answer

Mineral oil of high viscosity & specific gravity (1.6)

Answer

None of these

Question 7

A coal having high amount of volatile matter

Accepted Answer

All of the above

Answer

Would require smaller combustion chamber

Answer

Produces very little of tar and gas on carbonisation

Answer

Ignites easily and burns with long smoky flame

Question 8

High ash coals

Accepted Answer

Require longer time of carbonisation as ash offers resistance to heat transfer

Answer

Are soft & friable (poor strength and size stability)

Answer

Produce larger quantity of coke oven gas

Answer

None of these

Question 9

High ash containing coke

Accepted Answer

Produces more slag when used in the blast furnace

Answer

Has poor strength and abrasion resistance

Answer

Is desirable in producer gas manufacture

Answer

None of these