Fuels and Combustion MCQs

Question 1

Presence of force moisture in coal is most disadvantageous during its

Accepted Answer

Pulverisation

Answer

Transportation and handling

Answer

Washing

Answer

Storage

Question 2

Producer gas containing least amount of tar is produced by the

Accepted Answer

Partial combustion of large size (< 50 mm) coke

Answer

Partial combustion of coal

Answer

High pressure gasification of coal (e.g. in Lurgi gasifier)

Answer

Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)

Question 3

Coke oven gas constitutes mainly of

Accepted Answer

H2 & CH4

Answer

H2 & CO

Answer

CH4 & CO

Answer

H2 & CO2

Question 4

Which of the following is a poisonous fuel gas?

Accepted Answer

Blast furnace gas

Answer

Coke oven gas

Answer

Natural gas

Answer

None of these

Question 5

In flue gas analysis by Orsat's apparatus, oxygen is absorbed by

Accepted Answer

Alkaline pyragllol solution

Answer

Potassium hydroxide

Answer

Cuprous chloride

Answer

None of these

Question 6

Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about

Accepted Answer

8800 kcal/kg

Answer

8800 kcal/m3

Answer

Same as that of coal middling

Answer

25000 kcal/kg

Question 7

Pick out the wrong statement.:

Accepted Answer

Carburetted water gas is also called blue gas

Answer

Coals are divided in four species according to their carbon content in Seylor's classification

Answer

Carbonisation time in a by-product coke oven is about 16 hours

Answer

Gross and net calorific value of a fuel is the same, if it does not contain hydrogen or hydrocarbons

Question 8

Pick the odd man out.

Accepted Answer

Wood

Answer

Briquettes

Answer

Oil gas

Answer

Pitch creosote mixture

Question 9

Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the

Accepted Answer

Coke oven battery heating

Answer

Hot scarfing of steel slabs

Answer

Mixing with blast furnace gas

Answer

Steel ladle drying