Fuels and Combustion MCQs

Question 1

High pressure coal gasification is employed in __________ process.

Accepted Answer

Lurgi

Answer

Kopper-Totzek

Answer

Winkler

Answer

None of these

Question 2

In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.

Accepted Answer

Difference in gross & net calorific value of the coke oven gas

Answer

Free carbon content in tar

Answer

Yield percentage of coke

Answer

Yield of ammonia present in coke oven gas

Question 3

Which adsorbant is used for removing sulphur compounds (S Q, H2S, 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 4

Number of macrocomponents present in coal according to Stopes are

Accepted Answer

Four

Answer

Five

Answer

Six

Answer

Two

Question 5

Which of the following accentuates clinkering trouble on furnace grate burning coal?

Accepted Answer

All of the above

Answer

Low reactivity of carbonised residue containing high proportions of iron & sulphur

Answer

Low forced draught and fuel bed temperature

Answer

Thick fire bed and preheated primary air

Question 6

High temperature in gasification of coal favours

Accepted Answer

Both B and C

Answer

High production of CO2

Answer

Low production of CO2

Answer

High production of CO

Question 7

Which of the following oil gasification processes is non-catalytic?

Accepted Answer

Semet-Solvay process

Answer

Segas process

Answer

Onia-Gegi process

Answer

Steam reforming of naphtha

Question 8

Function of secondary air in pulverised coal firing is to

Accepted Answer

Ensure efficient burning of coal around the burner

Answer

Transport the coal to the burner

Answer

Dry the coal

Answer

Reduce primary air requirement

Question 9

'Mixed gas' used in steel plants is a mixture of

Accepted Answer

B.F. gas and coke oven gas

Answer

Coke oven gas and converter gas

Answer

Coke oven gas and LPG

Answer

Blast furnace gas and naphtha vapor