Fuels and Combustion Quiz 3
1 / 50
Coke compared to the coal from which it has been made, contains ______?
2 / 50
During its calorific value determination by bomb calorimeter, coal is combusted by __________?
3 / 50
Coking coals are invariably______?
4 / 50
Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the _________ of coal?
5 / 50
Coking time in beehive coke oven is about _____?
6 / 50
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the ________ of the mass?
7 / 50
Coke oven gas compared to blast furnace gas is_________?
8 / 50
Degree of carbonisation of coal during coke making can be roughly judged by the _______ of the coke produced?
9 / 50
During combustion of gaseous fuels, deficiency of air__________?
10 / 50
Coal tar (produced by high temperature carbonization) is the main source of_________?
11 / 50
Coke oven gas burns with a yellowish flame, because of the presence of ___________?
12 / 50
Flue gas from the heating chamber of by product coke ovens is removed by_________?
13 / 50
Coke made in narrower by-product coke ovens (as compared to wider ovens) is _______?
14 / 50
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of___________?
15 / 50
Coke oven gas is a better fuel than blast furnace gas, because of its higher_________?
16 / 50
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the______?
17 / 50
Coal is pulverised before burning in large capacity boiler furnaces mainly to______
18 / 50
Combustion of pulverised coal as compared to that of lump coal _________?
19 / 50
Coking time in narrow by-product coke ovens is around _______ hours?
20 / 50
Combustion reaction of fuels is a/an _______ reaction?
21 / 50
For long flame and easy ignition, the coal used should have__________?
22 / 50
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about _______?C?
23 / 50
During combustion of coal on grate, clinker formation is increased by the_____?
24 / 50
Coal tar fuel ? 200 (CTF 200) is a mixture of ___________?
25 / 50
Dust content in raw blast furnace gas is about ________ gm/Nm3; hence it is cleaned to the dust level of about < 10 mg /Nm3 before use?
26 / 50
Deficiency of combustion air during combustion of a gaseous fuel_______?
27 / 50
Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of _______?
28 / 50
Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the________?
29 / 50
Critical Air Blast (CAB) value of coke is a direct measure of its___________?
30 / 50
Fixed carbon in coal is defined as________?
31 / 50
Compound coke ovens are those which can be heated by ___________?
32 / 50
Dry air requirement for burning 1 Nm3 of CO to CO2 may be around ________ Nm3 ?
33 / 50
Coal tar (produced by high temperature carbonisation) is the main source of__________?
34 / 50
Coals used for the generation of producer gas should have ______?
35 / 50
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has__________?
36 / 50
Coke oven gas constitutes mainly of ______?
37 / 50
Coke ovens in steel plant are heated by _____?
38 / 50
Flue gas discharge velocity through chimney of a big thermal power plant may be around _________ m/sec?
39 / 50
During coking of coal, the ash content (percentage)_________?
40 / 50
Coke having higher porosity has _____?
41 / 50
For every 10% increase in the excess air; the fuel consumption increases by ________ percent?
42 / 50
Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain ___________?
43 / 50
Efficient burning of anthracite coal requires________?
44 / 50
Coke oven gas is stripped of its H2S and mercaptans content by__________?
45 / 50
Dry air required to burn 1 kg of carbon completely may be around _______ kg?
46 / 50
Coalification means the _____?
47 / 50
Coking time in a commercial high temperature coal carbonisation plant is about _______ hours?
48 / 50
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher ___________?
49 / 50
Efficiency of the combustion of a fuel is judged by the _______ the flue gas?
50 / 50
Fischer-Tropsch method aims at the ________?
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