chemical engineering fuels and combustion MCQs – Page 3

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 Review each marked answer and report any item that may be outdated or unclear.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

41. Mott and Wheeler test is conducted on coke to find its _____________________?
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A. Volatile matter content

B. Reactivity with O2

C. Abradability

D. Phosphorus content

42. Soft coke is not ___________________?
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A. Used in blast furnaces

B. Produced by low temperature carbonisation of coal

C. None of these

D. A domestic fuel

43. Which of the following has the highest theoretical flame temperature ?
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A. Blast furnace gas

B. Coke oven gas

C. Acetylene

D. Hydrogen

44. Caking index of a coal is a measure of its _______________________?
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A. Agglutinating (binding) properties

B. Reactivity

C. Abradability

D. Porosity

45. A coal having higher volatile matter content, has lower_________________?
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A. Smoking tendency on burning

B. Chance of catching fire during storage in open space

C. Coke oven gas yield on carbonisation

D. Ignition temperature

46. Coke oven gas is stripped of its H2S and mercaptans content by_________________?
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A. Adsorption on bog iron bed

B. Bubbling it through dilute sulphuric acid

C. Adsorption on silica gel

D. Absorption in wash oil

47. When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal?
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A. Oxidation

B. Gasification

C. Carbonisation

D. Coalification

48. Increase in ash content of blast furnace coke_________________?
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A. Reduces its consumption in the furnace

B. Decreases its hardness and abrasion resistance

C. Does not affect its consumption in the furnace

D. Increases its consumption in the furnace

49. Very ______________ coals are completely devoid of cokability i.e., it is non-coking ?
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A. Young

B. Mature

C. Both A & B

D. Neither A nor B

50. A coal having high volatile matter content will ________________?
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A. None of these

B. Give less yield of tar and gas on carbonisation

C. Have a very high calorific value

D. Burn with a small non-smoky flame

51. Which of the following is not endothermic ?
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A. Reforming

B. Gasification

C. Cracking

D. Partial oxidation

52. Hardgrove Grindability index of four coal samples are given below. Which of them is the easiest to grind ?
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A. 100

B. 70

C. 50

D. 85

53. The gasification reaction represented by, C + H2O = CO + H2, is__________________?
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A. Exothermic

B. Autocatalytic

C. Catalytic

D. Endothermic

54. Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher __________________?
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A. Difference in gross & net calorific value

B. Sulphur content

C. Higher C/H ratio

D. Calorific value

55. With increase in the oxygen content of the coal, its ______________ decreases?
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A. Calorific value

B. Caking power

C. Both A. & B.

D. Neither A. nor B.

56. Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around ______________ Nm3?
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A. 3,000

B. 30,000

C. 30

D. 300

57. Combustion reaction of fuels is a/an ______________ reaction?
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A. Endothermic

B. None of these

C. Exothermic

D. Auto catalytic

58. To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in___________________?
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A. Shallow and small piles

B. Fine sizes without the presence of any lump

C. Large heaps with small surface to volume ratio

D. Closed space without any ventilation facility

59. Calorific value of a typical dry anthracite coal may be around _____________ Kcal/kg?
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A. 15000

B. 8000

C. 4000

D. 1000

60. Proximate analysis of coal determines its ______________ content?
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A. None of these

B. Moisture, sulphur, nitrogen & fixed carbon

C. Moisture, volatile matter, ash & fixed carbon

D. Moisture, ash, sulphur & volatile matter

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