Fuels and Combustion Quiz 8
1 / 50
Volatile matter content in coking coal may be about ______ percent?
2 / 50
Washing of coal decreases its__________?
3 / 50
The sequence of absorption in flue gas analysis by Orsat?s apparatus is respectively_________?
4 / 50
When the coal is heated in absence of air, it is called its _________?
5 / 50
The most matured coal out of the following is___________?
6 / 50
The weathering index of a coal_________?
7 / 50
The temperature at which plastic layer formation takes place during carbonisation of coal varies from _______ ?C ?
8 / 50
Washing of coal does not reduce its________?
9 / 50
Very _______ coals are completely devoid of cokability i.e., it is non-coking ?
10 / 50
The main function of primary air in pulverised coal fired burner is to__________?
11 / 50
The main product of high temperature carbonisation of coal is___________?
12 / 50
The pyrogallol solution used in Orsat apparatus can absorb__________?
13 / 50
The maximum adiabatic flame temperature in air is ______ the maximum flame temperature in pure oxygen?
14 / 50
Weathering of coal during storage causes________?
15 / 50
The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to_____?
16 / 50
Which of the following accounts for maximum energy loss in a boiler ?
17 / 50
The reaction, C + CO2 ? 2CO, taking place during coal gasification is called the _______ reaction?
18 / 50
Which of the following accentuates clinkering trouble on furnace grate burning coal ?
19 / 50
Too much of excess air in combustion results in high_____?
20 / 50
Use of preheated air for combustion of fuel in the furnace, increases the_____?
21 / 50
Which is the heaviest fuel gas out of the following ?
22 / 50
The shift conversion reaction taking place during water gas manufacture is given by___________?
23 / 50
Washing of coal is done to reduce the__________?
24 / 50
The main drawback of supplying more excess air in the combustion of fuel is the__________?
25 / 50
Volumetric ratio of N2 to O2 in dry atmospheric air is _______?
26 / 50
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt ?using theoretical amount of air in_____?
27 / 50
Ultimate analysis of coal determines its ________ content?
28 / 50
Which of the following combustibles is absent in blast furnace gas ?
29 / 50
Tolerable concentration of toxic carbon monoxide in atmospheric air is about _______ ppm?
30 / 50
When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the ________ of coal?
31 / 50
When incomplete combustion loss is high, the flue gas analysis shows large amount of _________?
32 / 50
To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in_____?
33 / 50
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always _____?
34 / 50
The maximum adiabatic flame temperature in air as compared to that in pure oxygen is________?
35 / 50
Which of the following can be made into briquettes without the use of a binder ?
36 / 50
Which of the following coal gasification processes will produce gas having maximum methane content ?
37 / 50
The maximum adiabatic flame temperature is attained, when the fuel is burnt with ________?
38 / 50
Water gas constitutes mainly of ___________?
39 / 50
Washing of coal __________?
40 / 50
Which of the following constituents of coal is the most important in the production of coke ?
41 / 50
Traces of tar fog present in the coke oven gas is removed by__________?
42 / 50
Use of excess of combustion air in the combustion of fuels results in___________?
43 / 50
The optimum percentage of excess air for combustion depends upon the ________ of the fuel?
44 / 50
Which of the following constituents of a fuel does not contribute to its calorific value on combustion ?
45 / 50
Which is the most matured coal ?
46 / 50
Washing of coal_________?
47 / 50
Turndown ratio of a gas burner is equal to the ___________ ?
48 / 50
The maximum percentage of CO2 in a flue gas (from a carbonaceous fuel) can be__________?
49 / 50
Use of pulverised coal in boiler furnace provides_____?
50 / 50
Which of the following coke has the least percentage of ash ?
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