chemical engineering fuels and combustion MCQs – Page 2

Practise multiple-choice questions from chemical engineering fuels and combustion for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering fuels and combustion Mcqs

21. Which of the following is unsuitable fuel for producer gas manufacture ?
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A. Coal having low fusion point of its ash

B. Anthracite

C. Coke

D. Coal having high fusion point of its ash

22. The hottest part of the flame lies in its _______________ zone?
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A. Non-luminous

B. Unburnt gases

C. Yellow

D. Luminous

23. The reaction, C + CO2 ? 2CO, taking place during coal gasification is called the ______________ reaction?
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A. Shift conversion

B. Boudouard

C. Reduction

D. Neumann reversal

24. Percentage of carbon monoxide in blast furnace gas may be around ____________________ ?
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A. 8

B. 22

C. 14

D. 52

25. In general, the limit of inflammability/explosion limit of fuel gases is widened by the__________________?
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A. Use of pure oxygen for combustion instead of air

B. Increase in gas pressure

C. All A., B. & C.

D. Increase in temperature (i.e. preheating)

26. Bunsen burner is an example of a/an _____________ burner?
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A. Inside mixing/premix type

B. Rotary cup

C. Submerged combustion

D. Outside mixing/diffusion flame/nozzle mix type

27. The cooling medium used in dry quenching of coke is___________________?
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A. Air

B. Phenolic water

C. Nitrogen

D. Carbon dioxide

28. Coke ovens in steel plant are heated by ___________________?
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A. Electricity

B. Coke oven gas

C. Mixed gas

D. Both B. & C.

29. The maximum adiabatic flame temperature in air is _____________ the maximum flame temperature in pure oxygen?
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A. Higher than

B. Not related to

C. Lower than

D. Same as

30. Use of pulverised coal in boiler furnace provides___________________?
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A. High calorific value

B. Less erosion on furnace walls

C. Smokeless burning

D. Better combustion

31. Fuel for a nuclear reactor (thermal) is ____________________?
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A. Uranium

B. Plutonium

C. None of these

D. Radium

32. Rate of low temperature oxidation of coal due to bad storage conditions_______________?
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A. Is accelerated by storage in large heaps with small surface to volume ratio

B. Is more for low volatile coal compared to high volatile coal

C. Does not vary with increase in surface area

D. Decreases with increase in surface area

33. A good metallurgical coke___________________?
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A. Must contain moderate quantities of ash, moisture, sulphur and volatile matters

B. Should have low fusion point of its ash

C. Should have high porosity

D. Should be brittle

34. Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain __________________?
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A. CO

B. CO2

C. H2O

D. Both B. & C.

35. Which of the following has the highest calorific value ?
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A. Sub-bituminous coal

B. Peat

C. Anthracite

D. Lignite

36. Percentage of methane in coke oven gas may be around _____________________?
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A. 5

B. 50

C. 25

D. 15

37. A coal with high ash content is undesirable, as________________?
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A. causes its spalling due to different co-efficient of expansion/contraction of the refractory

B. boiler tubes thereby reducing the heat transfer

C. It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber

D. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace

E. All A., B. and C.

F. the ash

38. The catalyst used in shift converter is _____________________?
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A. Alumina

B. Silica gel

C. Vanadium

D. Nickel

39. Short/intense flame is produced during combustion of gaseous fuel by using________________?
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A. High amount/current of combustion air

B. Very little excess air

C. Preheated secondary air

D. Low amount/current of combustion air

40. Calorific value of blast furnace gas is around _____________ KCal/Nm3?
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A. 6500

B. 850

C. 4200

D. 1800

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