Fuels and Combustion Quiz 7
1 / 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 ___________?
2 / 50
The calorific value of L.D. converter gas is about _____ Kcal/Nm3?
3 / 50
The difference between total carbon and fixed carbon of coal will be minimum in case of_____?
4 / 50
Rate of low temperature oxidation of coal due to bad storage conditions________?
5 / 50
Quantity of coke produced from metallurgical coal may be around ______ percent?
6 / 50
The gasification reaction represented by, C + H2O = CO + H2, is___________?
7 / 50
The hottest part of the flame lies in its ________ zone?
8 / 50
The cuprous chloride used in orsat apparatus can absorb_____?
9 / 50
Removal of hydrogen from coke oven gas _____?
10 / 50
Safe condition for storage of high V.M. bituminous coal is that _____?
11 / 50
The main advantage of forced draft over natural draft is that______?
12 / 50
The fuel ratio of a coal is___________?
13 / 50
Softening temperature of coal ash is a measure of the ______ of coal?
14 / 50
The bright glow of a combustion process is the characteristic of _______ temperature oxidation of coal?
15 / 50
The internal energy of the combustion products is ______ compared to that of reactants?
16 / 50
The calorific value of ?LPG? (50% propane + 50% butane) is about _______ kcal/Nm3?
17 / 50
The advantage of firing pulverised coal in the furnace lies in the fact, that it______?
18 / 50
Sometimes water is sprayed during coal charging in the coke oven, which helps in _________?
19 / 50
Soft coke is not _____?
20 / 50
The heat of combustion of a fuel_____?
21 / 50
Stack (chimney) height in a big thermal power plant is dictated by the_____?
22 / 50
The calorific value of producer gas is around ______ kcal/Nm3?
23 / 50
Shatter index of the coke is a measure of its_____?
24 / 50
Stoichiometric combustion of 12 kg of carbon requires ______ of oxygen?
25 / 50
The cooling medium used in dry quenching of coke is_____?
26 / 50
The function of secondary combustion air is to ________?
27 / 50
Tar is a better fuel than furnace oil, because of its_____?
28 / 50
The liquid used for the washing of coal in an industrial coal washery is a mixture of water and ______?
29 / 50
Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively _______ percent?
30 / 50
Steam is intermittently admitted into the fuel bed during the production of producer gas to___________?
31 / 50
Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about _______ ?C?
32 / 50
Sulphur in metallurgical coal___________?
33 / 50
Ratio of primary air to secondary air increases with increase in the rank of coal, because the___________?
34 / 50
The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be_____?
35 / 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_____?
36 / 50
The catalyst used in shift converter is _______?
37 / 50
The gas which contributes maximum to the heating value of natural gas is ___________?
38 / 50
Spontaneous combustion of coal on storage results due to_____?
39 / 50
Purity of coke means that, it is high in carbon and low in ___________?
40 / 50
The combustion reaction, C + O2 = CO2, is _____?
41 / 50
Proximate analysis of coal determines its _______ content?
42 / 50
Stack heat losses can be minimised by_________?
43 / 50
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around _______ Nm3?
44 / 50
The calorific value is the highest out of the following for___________?
45 / 50
Short/intense flame is produced during combustion of gaseous fuel by using_________?
46 / 50
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around ________ percent?
47 / 50
Pulverised coal used in boiler firing need not have______?
48 / 50
Supply of excess air for complete combustion of fuel is necessitated to facilitate_____?
49 / 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_____?
50 / 50
The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called ?
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