Chemical Engineering - Fuels and Combustion

36. 

Removal of hydrogen from coke oven gas

A. increases its calorific value.
B. decreases its calorific value.
C. does not alter its calorific value.
D. is not possible on commerical scale.

Answer: Option A

Explanation:

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37. 

If oxygen content in the flue gas rises too high, fuel is being wasted by

A. incomplete combustion.
B. dry gas/stack gas loss.
C. moisture loss.
D. none of these.

Answer: Option B

Explanation:

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38. 

Increase in ash content of blast furnace coke

A. reduces its consumption in the furnace.
B. increases its consumption in the furnace.
C. does not affect its consumption in the furnace.
D. decreases its hardness and abrasion resistance.

Answer: Option B

Explanation:

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39. 

Safe condition for storage of high V.M. bituminous coal is that

A. height of the coal heap should be < 3 metres.
B. maximum 200 tons should be stored in a heap.
C. both (a) and (b).
D. neither (a) nor (b).

Answer: Option C

Explanation:

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40. 

Ignition temperature of a fuel in air is __________ that in pure oxygen.

A. more than
B. less than
C. equal to
D. either more or less; depends on the type of fuel

Answer: Option A

Explanation:

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