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Fuels and Combustion Quiz 7

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Fuels and Combustion Quiz 7

1 / 50

Quantity of coke produced from metallurgical coal may be around ______ percent?

2 / 50

The function of secondary combustion air is to ________?

3 / 50

The calorific value is the highest out of the following for___________?

4 / 50

The cooling medium used in dry quenching of coke is_____?

5 / 50

The bright glow of a combustion process is the characteristic of _______ temperature oxidation of coal?

6 / 50

Stack (chimney) height in a big thermal power plant is dictated by the_____?

7 / 50

The difference between total carbon and fixed carbon of coal will be minimum in case of_____?

8 / 50

Sulphur in metallurgical coal___________?

9 / 50

Sometimes water is sprayed during coal charging in the coke oven, which helps in _________?

10 / 50

The hottest part of the flame lies in its ________ zone?

11 / 50

Proximate analysis of coal determines its _______ content?

12 / 50

Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO2, 20%CO and 10%O2. The percent excess oxygen used is ___________?

13 / 50

Tar is a better fuel than furnace oil, because of its_____?

14 / 50

Softening temperature of coal ash is a measure of the ______ of coal?

15 / 50

The calorific value of ?LPG? (50% propane + 50% butane) is about _______ kcal/Nm3?

16 / 50

Rate of low temperature oxidation of coal due to bad storage conditions________?

17 / 50

The fuel ratio of a coal is___________?

18 / 50

Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around _______ Nm3?

19 / 50

Temperature 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_____?

20 / 50

The liquid used for the washing of coal in an industrial coal washery is a mixture of water and ______?

21 / 50

The calorific value of producer gas is around ______ kcal/Nm3?

22 / 50

The advantage of firing pulverised coal in the furnace lies in the fact, that it______?

23 / 50

The gasification reaction represented by, C + H2O = CO + H2, is___________?

24 / 50

The calorific value of L.D. converter gas is about _____ Kcal/Nm3?

25 / 50

The combustion reaction, C + O2 = CO2, is _____?

26 / 50

Ratio of primary air to secondary air increases with increase in the rank of coal, because the___________?

27 / 50

The internal energy of the combustion products is ______ compared to that of reactants?

28 / 50

Spontaneous combustion of coal on storage results due to_____?

29 / 50

The cuprous chloride used in orsat apparatus can absorb_____?

30 / 50

Pulverised coal used in boiler firing need not have______?

31 / 50

Stoichiometric combustion of 12 kg of carbon requires ______ of oxygen?

32 / 50

Supply of excess air for complete combustion of fuel is necessitated to facilitate_____?

33 / 50

Purity of coke means that, it is high in carbon and low in ___________?

34 / 50

The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called ?

35 / 50

The gas which contributes maximum to the heating value of natural gas is ___________?

36 / 50

The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be_____?

37 / 50

Short/intense flame is produced during combustion of gaseous fuel by using_________?

38 / 50

The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorific value will be_____?

39 / 50

Safe condition for storage of high V.M. bituminous coal is that _____?

40 / 50

Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively _______ percent?

41 / 50

Soft coke is not _____?

42 / 50

The catalyst used in shift converter is _______?

43 / 50

The heat of combustion of a fuel_____?

44 / 50

Steam is intermittently admitted into the fuel bed during the production of producer gas to___________?

45 / 50

Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around ________ percent?

46 / 50

Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about _______ ?C?

47 / 50

Shatter index of the coke is a measure of its_____?

48 / 50

The main advantage of forced draft over natural draft is that______?

49 / 50

Stack heat losses can be minimised by_________?

50 / 50

Removal of hydrogen from coke oven gas _____?

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