Fuels And Combustion — Part 1 MCQs with Explanations

The calorific value of a fuel is the amount of heat energy released during its combustion. For dry wood, the calorific value is typically around 5000 Kcal/kg, making it a good source of energy for combustion processes. This value can vary slightly depending on the type of wood and its composition, but 5000 Kcal/kg is a common average used in calculations and assessments.

CO content is the correct answer to “Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Both B & C is the correct answer to “High sulphur content in a fuel __________ of the flue gases.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

1100 is the correct answer to “Fusion point of coal ash generally varies from 1000 to 1700°C. Ash having fusion point less than __________ °C is liable to form clinker.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Pitch and creosote oil is the correct answer to “Coal tar fuel - 200 (CTF 200) is a mixture of”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Entrained is the correct answer to “Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

CH4 is the correct answer to “Which of the following combustibles is absent in blast furnace gas”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Lump coal (fixed on chain grate) is the correct answer to “Which of the following would require maximum amount of % excess air for complete combustion”. This question is standard in competitive examination syllabi for Fuels And Combustion.

CO2 : 7.42, CO : 1.86, O2 : 4.64, N2 : 86.02 is the correct answer to “A sample of natural gas containing 80% methane (CH 4 ) and rest nitrogen (N 2 ) is burnt with 20% excess air. With 80% of the combustibles producing CO 2 and the reminder going to CO, the Orsat analysis in volume percent is”. This question is standard in competitive examination syllabi for Fuels And Combustion.

5400 is the correct answer to “Calorific value of gobar gas (containing CH 4 = 60%, H 2 = 10%, CO 2 = 30%) may be about __________ Kcal/Nm 3 .”. This question is standard in competitive examination syllabi for Fuels And Combustion.

4000 is the correct answer to “Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

6500 is the correct answer to “Calorific value of bituminous coal may be around __________ Kcal/kg.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

8000 is the correct answer to “Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

24 is the correct answer to “Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

1-2 is the correct answer to “Volatile matter content of metallurgical coke may be around __________ percent.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

75 is the correct answer to “Quantity of coke produced from metallurgical coal may be around __________ percent.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

80 is the correct answer to “Abrasion index of blast furnace coke should be around __________ percent.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

None of these is the correct answer to “Which of the following is not a binder for coal briquetting”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Both A & B is the correct answer to “Natural draught produced by a chimney depends upon the”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Potassium hydroxide is the correct answer to “In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Equal to the height of the hot gas column producing draught is the correct answer to “For maximum discharge through a chimney, its height should be”. This question is standard in competitive examination syllabi for Fuels And Combustion.

All of the above is the correct answer to “Fuel consumption in coke making can be reduced by”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Lower theoretical flame temperature is the correct answer to “Blast furnace gas compared to coke oven gas has”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Can be done with less excess air is the correct answer to “Combustion of pulverised coal as compared to that of lump coal”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Reactivity with O2 is the correct answer to “Mott and Wheeler test is conducted on coke to find its”. This question is standard in competitive examination syllabi for Fuels And Combustion.

CH4 (upto 90%) is the correct answer to “Main constituent of natural gas is”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Banking is the correct answer to “Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Increases its consumption in the furnace is the correct answer to “Increase in ash content of blast furnace coke”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Is accelerated by storage in large heaps with small surface to volume ratio is the correct answer to “Rate of low temperature oxidation of coal due to bad storage conditions”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Complete combustion is the correct answer to “During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Natural gas is the correct answer to “Which of the following is a primary fuel”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Partial oxidation is the correct answer to “Which of the following is not endothermic”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Natural gas is the correct answer to “Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm 3 gas”. This question is standard in competitive examination syllabi for Fuels And Combustion.

All of the above is the correct answer to “During combustion of coal on grate, clinker formation is increased by the”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Adsorption on bog iron bed is the correct answer to “Coke oven gas is stripped of its H 2 S and mercaptans content by”. This question is standard in competitive examination syllabi for Fuels And Combustion.

H2 is the correct answer to “Which of the following has the highest flame speed”. This question is standard in competitive examination syllabi for Fuels And Combustion.

None of these is the correct answer to “A good coking coal should have high __________ content.”. This question is standard in competitive examination syllabi for Fuels And Combustion.

Dry gas/stack gas loss is the correct answer to “If oxygen content in the flue gas rises too high, fuel is being wasted by”. This question is standard in competitive examination syllabi for Fuels And Combustion.

2-3 days is the correct answer to “Coking time in beehive coke oven is about”. This question is standard in competitive examination syllabi for Fuels And Combustion.

All of the above is the correct answer to “Too much of excess air in combustion results in high”. This question is standard in competitive examination syllabi for Fuels And Combustion.