Fuels and Combustion MCQs

Question 1

Coke oven gas burns with an yellowish flame, because of the presence of

Accepted Answer

CH 4

Answer

CO 2

Answer

H 2

Answer

NH 3

Question 2

Blast furnace gas burns with a bluish flame, because of the presence of

Accepted Answer

CO

Answer

CH 4

Answer

CO 2

Answer

S

Question 3

With increase in C/H ratio of a fuel, the amount of CO 2 formed on its complete combustion

Accepted Answer

Increases

Answer

Decreases

Answer

Remains same

Answer

Either A or B, depends on other factors

Question 4

Which adsorbant is used for removing sulphur compounds (S Q, H 2 S, RSH etc.) removal from coke oven gas in by-products recovery plant?

Accepted Answer

Bog iron (i.e., moist ferric hydroxide)

Answer

Silica gel

Answer

Diatomaceous earth

Answer

Basalt

Question 5

High temperature in gasification of coal favours

Accepted Answer

Both B and C

Answer

High production of CO 2

Answer

Low production of CO 2

Answer

High production of CO

Question 6

The calorific value of a gas of composition CO 2 = 20%, H 2 = 50%, CH 4 = 30%, is y. If the composition of gas is changed to H 2 = 50%, CH 4 = 30%, CO 2 = 10%, N 2 = 10%, then the calorific value will be

Accepted Answer

y

Answer

0.95 y

Answer

1.05 y

Answer

1.8 y

Question 7

Blast furnace gas constitutes mainly of

Accepted Answer

N 2 & CO

Answer

N 2 & CH 4

Answer

N 2 & H 2

Answer

CH 4 & CO 2

Question 8

Oxygen required for theoretically complete combustion of 1 Nm 3 methane is __________ Nm 3 .

Accepted Answer

2

Answer

4

Answer

6

Answer

1

Question 9

The gasification reaction represented by, C + H 2 O = CO + H 2 , is

Accepted Answer

Endothermic

Answer

Exothermic

Answer

Catalytic

Answer

Autocatalytic