Fuels and Combustion MCQs

Question 1

The shift conversion reaction taking place during water gas manufacture is given by

Accepted Answer

CO + H 2 O ⟷ CO 2 + H 2

Answer

C + H 2 O ⟷ CO + H 2

Answer

C + 2H 2 O ⟷ CO 2 + 2H 2

Answer

None of these

Question 2

The main function of primary air in pulverised coal fired burner is to

Accepted Answer

Dry and transport the coal

Answer

Burn CO to CO 2

Answer

Have proper combustion by supplying it around the burner

Answer

Preheat the tertiary air used for complete combustion of CO to CO 2

Question 3

Which of the following gaseous fuels has the highest net calorific value (kcal/Nm 3 )?

Accepted Answer

Liquified petroleum gas

Answer

Producer gas

Answer

Carburetted water gas

Answer

Natural gas

Question 4

Advantages of fluidised bed combustion are

Accepted Answer

All of the above

Answer

Reduced NO x formation in flue gas

Answer

Lower furnace operating temperature

Answer

High heat transfer rate

Question 5

Temperature of coke oven gas just before entering into saturator (for recovery of NH 3 ) is about __________ °C.

Accepted Answer

65

Answer

30

Answer

120

Answer

180

Question 6

Which of the following has the highest heat of combustion?

Accepted Answer

C 2 H 6

Answer

H 2

Answer

CO

Answer

CH 4

Question 7

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

Accepted Answer

2CO ⟷ C + CO 2

Answer

CO + H 2 O ⟷ CO 2 + H 2

Answer

C + H 2 O ⟷ CO + H 2

Answer

C + 2H 2 O ⟷ CO 2 + 2H 2

Question 8

Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain

Accepted Answer

Both B & C

Answer

CO

Answer

CO 2

Answer

H 2 O

Question 9

Which of the following is the most reactive (as regards the formation of CO + H 2 from C + H 2 O)?

Accepted Answer

Low temperature coke

Answer

Blast furnace coke

Answer

Anthracite coal

Answer

Sub-bituminous coal