Chemical Engineering - Fuels and Combustion

16. 

Pick out the wrong statement.

A. LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals.
B. The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point.
C. Each ton of petroleum oil on distillation produces about 30-50 Nm3 of gas.
D. Maximum yield of naphthalene is obtained on distillation of crude oil.

Answer: Option B

Explanation:

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17. 

Stack heat losses can be minimised by

A. controlling the excess air.
B. oxygen enrichment of combustion air.
C. using low c.v. fuels.
D. maintaining proper draft in the furnace.

Answer: Option A

Explanation:

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18. 

Laboratory gas is obtained by the cracking of

A. gasoline
B. diesel
C. fuel oil
D. kerosene

Answer: Option D

Explanation:

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19. 

Bituminous coal

A. ignites less easily than anthracite.
B. is generally coking.
C. burns with smoky yellow flame.
D. both (b) and (c).

Answer: Option D

Explanation:

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20. 

Ratio of primary air to secondary air increases with increase in the rank of coal, because the

A. high rank coals have higher amount of volatile matter.
B. ratio of fixed carbon to volatile matter increases.
C. oxygen content progressively decreases.
D. calorific value of the coal increases.

Answer: Option B

Explanation:

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