Fuels And Combustion MCQ Questions & Answers | Chemical Engineering Page-7 section-1

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61.
Dry air requirement for burning 1 Nm³ of CO to CO₂ may be around __________ Nm³.

A. 2.4

B. 1.75

C. 0.87

D. 11.4

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62.
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

A. It contains large amount of volatile matter

B. It is stored in tall heaps

C. Smaller fines are stored in large quantity

D. All of the above

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63.
Pick out the wrong statement.

A. Indian coals on an average contain 25-30% ash as against 10-12% ash in imported coking coal

B. Ammonia is recovered in the form of ammonium sulphate in direct process of by-product recovery

C. A high swelling index number of coking coal indicates poor caking properties of coal

D. Wash oil is used for scrubbing benzol from coke oven gas

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64.
With increase in moisture content of coal, its

A. Calorific value increases sometimes

B. Bulk density always decreases

C. Clinkering tendency during combustion increases

D. None of these

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65.
Gray King Assay and Swelling Index of a coal is a measure of its

A. Swelling characteristics

B. Abradability

C. Agglutinating properties

D. Resistance to impact breakage

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66.
Caking index of a coal is a measure of its

A. Abradability

B. Reactivity

C. Agglutinating (binding) properties

D. Porosity

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67.
Micum Index of a coke is a measure of its

A. Reactivity

B. Porosity

C. Bulk density

D. Hardness & strength

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68.
Weathering of coal during storage causes

A. Reduction in coal size

B. Increase in its friability

C. Decrease in its caking capacity

D. All of the above

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69.
Low temperature oxidation of coal is accelerated by the

A. Storage in large heaps

B. Storage in compressed piles

C. Absence of porous or friable particles

D. All of the above

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70.
Washing of coal is done to reduce the

A. Inherent impurities

B. Adhering impurities

C. Mineral matter

D. Both B and C

Answer & Solution Discuss in Board Save for Later

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Fuels And Combustion MCQ Questions & Answers | Chemical Engineering

61. Dry air requirement for burning 1 Nm3 of CO to CO2 may be around __________ Nm3.

Answer & Solution

62. Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

Answer & Solution

63. Pick out the wrong statement.

Answer & Solution

64. With increase in moisture content of coal, its

Answer & Solution

65. Gray King Assay and Swelling Index of a coal is a measure of its

Answer & Solution

66. Caking index of a coal is a measure of its

Answer & Solution

67. Micum Index of a coke is a measure of its

Answer & Solution

68. Weathering of coal during storage causes

Answer & Solution

69. Low temperature oxidation of coal is accelerated by the

Answer & Solution

70. Washing of coal is done to reduce the

Answer & Solution

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61.
Dry air requirement for burning 1 Nm³ of CO to CO₂ may be around __________ Nm³.

62.
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

63.
Pick out the wrong statement.

64.
With increase in moisture content of coal, its

65.
Gray King Assay and Swelling Index of a coal is a measure of its

66.
Caking index of a coal is a measure of its

67.
Micum Index of a coke is a measure of its

68.
Weathering of coal during storage causes

69.
Low temperature oxidation of coal is accelerated by the

70.
Washing of coal is done to reduce the