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Fuels and Combustion Quiz 3

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Fuels and Combustion Quiz 3

1 / 50

Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the________?

2 / 50

Coal tar fuel ? 200 (CTF 200) is a mixture of ___________?

3 / 50

During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the ________ of the mass?

4 / 50

Coking time in narrow by-product coke ovens is around _______ hours?

5 / 50

Coke oven gas is a better fuel than blast furnace gas, because of its higher_________?

6 / 50

During its calorific value determination by bomb calorimeter, coal is combusted by __________?

7 / 50

Coals used for the generation of producer gas should have ______?

8 / 50

Coal tar (produced by high temperature carbonisation) is the main source of__________?

9 / 50

Flue gas discharge velocity through chimney of a big thermal power plant may be around _________ m/sec?

10 / 50

For long flame and easy ignition, the coal used should have__________?

11 / 50

Deficiency of combustion air during combustion of a gaseous fuel_______?

12 / 50

Coking time in beehive coke oven is about _____?

13 / 50

Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of _______?

14 / 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?

15 / 50

Fischer-Tropsch method aims at the ________?

16 / 50

Coal is pulverised before burning in large capacity boiler furnaces mainly to______

17 / 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?

18 / 50

Coke having higher porosity has _____?

19 / 50

Dry air requirement for burning 1 Nm3 of CO to CO2 may be around ________ Nm3 ?

20 / 50

For every 10% increase in the excess air; the fuel consumption increases by ________ percent?

21 / 50

Critical Air Blast (CAB) value of coke is a direct measure of its___________?

22 / 50

Coking coals are invariably______?

23 / 50

Degree of carbonisation of coal during coke making can be roughly judged by the _______ of the coke produced?

24 / 50

Coke oven gas constitutes mainly of ______?

25 / 50

Coking time in a commercial high temperature coal carbonisation plant is about _______ hours?

26 / 50

Coke compared to the coal from which it has been made, contains ______?

27 / 50

Coke ovens in steel plant are heated by _____?

28 / 50

During combustion of coal on grate, clinker formation is increased by the_____?

29 / 50

Coke oven gas compared to blast furnace gas is_________?

30 / 50

Coke oven gas is stripped of its H2S and mercaptans content by__________?

31 / 50

Coke oven gas burns with a yellowish flame, because of the presence of ___________?

32 / 50

Coal tar (produced by high temperature carbonization) is the main source of_________?

33 / 50

Efficient burning of anthracite coal requires________?

34 / 50

Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain ___________?

35 / 50

Combustion of pulverised coal as compared to that of lump coal _________?

36 / 50

Fixed carbon in coal is defined as________?

37 / 50

During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the______?

38 / 50

Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has__________?

39 / 50

Coke made in narrower by-product coke ovens (as compared to wider ovens) is _______?

40 / 50

Efficiency of the combustion of a fuel is judged by the _______ the flue gas?

41 / 50

Combustion reaction of fuels is a/an _______ reaction?

42 / 50

Dry air required to burn 1 kg of carbon completely may be around _______ kg?

43 / 50

Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher ___________?

44 / 50

Coalification means the _____?

45 / 50

Flue gas from the heating chamber of by product coke ovens is removed by_________?

46 / 50

During combustion of gaseous fuels, deficiency of air__________?

47 / 50

Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of___________?

48 / 50

Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the _________ of coal?

49 / 50

During coking of coal, the ash content (percentage)_________?

50 / 50

Compound coke ovens are those which can be heated by ___________?

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