Multiple Choice Questions on Fuels and CombustionThe Following Section consists of Multiple Choice Questions on Fuels and Combustion.
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Fuels and Combustion MCQ
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Question 1 of 20
1. Question
1 pointsLow temperature carbonisation
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Question 2 of 20
2. Question
1 pointsGross and net calorific value of a fuel will be the same
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Question 3 of 20
3. Question
1 pointsDuring combustion of gaseous fuels, deficiency of air
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Question 4 of 20
4. Question
1 pointsA coal containing very high percentage of durain is called __________ coal.
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Question 5 of 20
5. Question
1 pointsHigher efficiency in the combustion of solid fuel can not be achieved by
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Question 6 of 20
6. Question
1 pointsWhich of the following is not used as a binder in coal briquetting ?
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Question 7 of 20
7. Question
1 pointsSize of blast furnace grade coke is __________ mm.
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Question 8 of 20
8. Question
1 pointsPresence of __________ in a dry gaseous fuel does not contribute to its calorific value.
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Question 9 of 20
9. Question
1 pointsThe internal energy of the combustion products is __________ compared to that of reactants.
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Question 10 of 20
10. Question
1 pointsWhich of the following is not a product of tar distillation ?
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Question 11 of 20
11. Question
1 pointsJunker’s calorimeter is used to determine the calorific value of
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Question 12 of 20
12. Question
1 pointsCombustion reaction of fuels is a/an __________ reaction.
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Question 13 of 20
13. Question
1 pointsImproper storage condition results in the weathering of coal and spontaneous combustion, which increases its
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Question 14 of 20
14. Question
1 pointsWhich of the following constituents of coal is the most important in the production of coke?
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Question 15 of 20
15. Question
1 pointsStack heat losses can be minimised by
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Question 16 of 20
16. Question
1 pointsLaboratory gas is obtained by the cracking of
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Question 17 of 20
17. Question
1 pointsRatio of primary air to secondary air increases with increase in the rank of coal, because the
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Question 18 of 20
18. Question
1 pointsCarbon Content by weight in air dried wood may be about __________ percent.
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Question 19 of 20
19. Question
1 pointsGross & net calorific value is the same for
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Question 20 of 20
20. Question
1 pointsHigher percentage of ash in coal meant for the production of metallurgical grade coke
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Fuels and Combustion MCQ 2
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Question 1 of 20
1. Question
1 pointsCombustion of pulverised coal as compared to that of lump coal
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Question 2 of 20
2. Question
1 points‘Wobbe index’ is a characteristic of
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Question 3 of 20
3. Question
1 pointsA coal with high ash content is undesirable, as
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Question 4 of 20
4. Question
1 pointsPresence of free moisture in coal during its high temperature carbonisation
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Question 5 of 20
5. Question
1 pointsGray King Assay and Swelling Index of a coal is a measure of its
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Question 6 of 20
6. Question
1 pointsExplosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.
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Question 7 of 20
7. Question
1 pointsFuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
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Question 8 of 20
8. Question
1 pointsCalorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
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Question 9 of 20
9. Question
1 pointsFlue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
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Question 10 of 20
10. Question
1 pointsWhich of the following is used for making the explosive ‘TNT’ ?
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Question 11 of 20
11. Question
1 pointsWhich of the following gaseous fuels has the lowest calorific value ?
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Question 12 of 20
12. Question
1 pointsWhich of the following is not a by-product recovered in a high temperature coal carbonisation plant ?
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Question 13 of 20
13. Question
1 pointsPensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
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Question 14 of 20
14. Question
1 pointsThe temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
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Question 15 of 20
15. Question
1 pointsTemperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the
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Question 16 of 20
16. Question
1 pointsFor every 10% increase in the excess air; the fuel consumption increases by __________ percent.
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Question 17 of 20
17. Question
1 pointsPick out the wrong statement.
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Question 18 of 20
18. Question
1 pointsDry air required to burn 1 kg of carbon completely may be around __________ kg.
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Question 19 of 20
19. Question
1 pointsSoftening temperature of coal ash is a measure of the __________ of coal.
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Question 20 of 20
20. Question
1 pointsA fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be
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Fuels and Combustion MCQ 3
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Question 1 of 20
1. Question
1 pointsInitial pressure of oxygen introduced into the ‘bomb’ of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.
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Question 2 of 20
2. Question
1 points‘Fat’ coal means a coal having
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Question 3 of 20
3. Question
1 pointsAtomising steam to fuel oil ratio in a burner should be around
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Question 4 of 20
4. Question
1 pointsOxygen percentage (by weight) in atmospheric air is
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Question 5 of 20
5. Question
1 points__________ of the coal is the basis for Seylor’s coal classification.
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Question 6 of 20
6. Question
1 pointsMain constituents of benzol are
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Question 7 of 20
7. Question
1 points“Overfire burning” in a furnace is a phenomenon characterised by the
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Question 8 of 20
8. Question
1 pointsYield of pitch from distillation of high temperature tar is around __________ percent.
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Question 9 of 20
9. Question
1 pointsIf the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
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Question 10 of 20
10. Question
1 pointsWhich of the following petrographic constituents of coal is non-coking ?
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Question 11 of 20
11. Question
1 points__________ has the widest inflammability limit (explosion limit) of all the gases.
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Question 12 of 20
12. Question
1 pointsPercentage of methane in coke oven gas may be around
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Question 13 of 20
13. Question
1 pointsIn flue gas analysis by Orsat’s apparatus, carbon dioxide is absorbed by
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Question 14 of 20
14. Question
1 pointsCaking index of the coal blend used for the manufacture of metallurgical coke should be around
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Question 15 of 20
15. Question
1 pointsWith increase in moisture content of coal, its
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Question 16 of 20
16. Question
1 pointsProximate analysis of coal determines its __________ content.
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Question 17 of 20
17. Question
1 pointsPresence of free moisture in coal is most disadvantageous during
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Question 18 of 20
18. Question
1 pointsThe heat of combustion of a fuel
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Question 19 of 20
19. Question
1 pointsHigh excess air in combustion of fuels results in
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Question 20 of 20
20. Question
1 pointsAbrasion index of blast furnace coke should be around __________ percent.
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Fuels and Combustion MCQ 4
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Question 1 of 20
1. Question
1 pointsTar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.
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Question 2 of 20
2. Question
1 pointsCannel coal and boghead coal are the examples of
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Question 3 of 20
3. Question
1 pointsCoking time in beehive coke oven is about
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Question 4 of 20
4. Question
1 pointsWhich of the following has the highest calorific value ?
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Question 5 of 20
5. Question
1 points__________ present in coal is not determined in its ultimate analysis.
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Question 6 of 20
6. Question
1 points__________ prohibits the use of alcohols directly in petrol engines.
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Question 7 of 20
7. Question
1 pointsHigher fuel combustion efficiency can not be achieved by
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Question 8 of 20
8. Question
1 pointsWhich of the following is the maximum coal producing state in India ?
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Question 9 of 20
9. Question
1 pointsHeight of coke oven is limited (say maximum upto 7 metres) mainly by the
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Question 10 of 20
10. Question
1 pointsOut of the following fuels, the difference between the net and gross calorific value is maximum in case of
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Question 11 of 20
11. Question
1 pointsThe hottest part of the flame lies in its____zone.
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Question 12 of 20
12. Question
1 pointsBunsen burner is an example of a/an __________ burner.
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Question 13 of 20
13. Question
1 pointsA good quality coal should have
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Question 14 of 20
14. Question
1 pointsHigh amount of sulphur and phosphorous in coke causes
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Question 15 of 20
15. Question
1 pointsThe difference between total carbon and fixed carbon of coal will be minimum in case of
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Question 16 of 20
16. Question
1 pointsThe maximum adiabatic flame temperature is attained, when the fuel is burnt with
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Question 17 of 20
17. Question
1 pointsGrindability index of a coal is 100. It implies that the
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Question 18 of 20
18. Question
1 pointsThe cooling medium used in dry quenching of coke is
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Question 19 of 20
19. Question
1 pointsA particular coal is said to be free burning when it
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Question 20 of 20
20. Question
1 pointsGobar gas is produced by the __________ of ‘gobar’ (cow dung).
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