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Fuels and Combustion Quiz 4

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Fuels and Combustion Quiz 4

1 / 50

High temperature carbonisation of coal takes place at ________ ?C?

2 / 50

High ash coals ______?

3 / 50

Gross & net calorific value is the same for_____?

4 / 50

High temperature in gasification of coal favours_________?

5 / 50

Higher efficiency in the combustion of solid fuel cannot be achieved by_________?

6 / 50

Gobar gas constitutes mainly of_____?

7 / 50

Fuel for a fast breeder nuclear reactor is______?

8 / 50

Height of coke oven is limited (say maximum upto 7 metres) mainly by the_______?

9 / 50

Ignition temperature decreases progressively from anthracite to lignite, because_____?

10 / 50

Froth floatation is used for__________?

11 / 50

Gross and net calorific value of a fuel will be the same___________?

12 / 50

High sulphur content in a fuel _______ of the flue gases?

13 / 50

Hardgrove Grindability index of four coal samples are given below. Which of them is the easiest to grind ?

14 / 50

High excess air in combustion of fuels results in______?

15 / 50

High rate of heating of coke ovens______?

16 / 50

For maximum discharge through a chimney, its height should be_____?

17 / 50

If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be______?

18 / 50

If oxygen content in the flue gas rises too high, fuel is being wasted by ________?

19 / 50

Gray King Assay and Swelling Index of a coal is a measure of its ______?

20 / 50

Fusion point of coal ash increases with increase in its _____ content?

21 / 50

Fossil fuels mean_____?

22 / 50

Fuel combustion is never cent per cent efficient due to_____?

23 / 50

Grindability index of a coal is 100. It implies that the _____?

24 / 50

Fussain _______?

25 / 50

Fuel consumption in coke making can be reduced by_____?

26 / 50

Gross heating value of coal is _______ the net heating value?

27 / 50

Function of secondary air in pulverised coal firing is to__________?

28 / 50

Gas yield in the Kopper-Totzek coal gasifier is about _______ Nm3/ton coal (ash = 35%)?

29 / 50

Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around _______ cm/hr?

30 / 50

Fuel for a nuclear reactor (thermal) is ______?

31 / 50

In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of___________?

32 / 50

Highly reactive coke have lower _____?

33 / 50

Hard pitch is used for making_______?

34 / 50

Hard coke is manufactured from_____?

35 / 50

Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its__________?

36 / 50

High temperature carbonisation of coal produces___________?

37 / 50

Gobar gas is produced by the _______ of cow dung?

38 / 50

High amount of sulphur and phosphorous in coke causes ______ ?

39 / 50

Higher fuel combustion efficiency cannot be achieved by__________?

40 / 50

Highly caking coals_______?

41 / 50

Gobar gas is produced by the ________ of ?gobar? (cow dung) ?

42 / 50

Higher percentage of ash in coal meant for the production of metallurgical grade coke _____?

43 / 50

For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will_______?

44 / 50

High pressure coal gasification is employed in _________ process?

45 / 50

Gross heating value of coal is _______ the net heating value?

46 / 50

Ignition temperature of a fuel in air is _______ that in pure oxygen?

47 / 50

High ash containing coke______?

48 / 50

Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about ______ ?C?

49 / 50

If CO2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as_____?

50 / 50

Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300?) may be reduced by about _______ percent as compared to the use of atmospheric combustion air?

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