Chemical Engineering - Fuels and Combustion

41. 

C/H ratio is the maximum in case of

A. coal
B. furnace oil
C. natural gas
D. naphtha

Answer: Option A

Explanation:

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42. 

Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.

A. smoke
B. temperature
C. oxygen
D. carbon monoxide

Answer: Option D

Explanation:

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43. 

Low temperature oxidation of stored coal results in the

A. decrease in its caking power & calorific value.
B. decrease in its carbon & hydrogen content.
C. increase in its oxygen content.
D. all (a), (b) and (a).

Answer: Option D

Explanation:

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44. 

Gross calorific value will be equal to the net calorific value for

A. H2
B. C2H2
C. CO
D. C2H6

Answer: Option C

Explanation:

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45. 

Bulk density of pulverised coal may be about __________ kg/m3.

A. 100
B. 500
C. 1000
D. 1500

Answer: Option B

Explanation:

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