Chemical Engineering - Fuels and Combustion

41. 

Octane number of 2, 2, 4 - trimethyl pen-tane is

A. 0
B. 100
C. in between 0 and 100
D. more than 100

Answer: Option B

Explanation:

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42. 

Which of the following has the highest flame speed ?

A. CO
B. H2
C. CH4
D. C2H6

Answer: Option B

Explanation:

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43. 

Coke ovens in steel plant are heated by

A. electricity
B. coke oven gas
C. mixed gas
D. both(b) & (c)

Answer: Option D

Explanation:

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44. 

Coke oven gas is a better fuel than blast furnace gas, because of its higher

A. calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity).
B. adiabatic flame temperature.
C. heat release rate (thus requiring smaller combustion chamber).
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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45. 

Short/intense flame is produced during combustion of gaseous fuel by using

A. high amount/current of combustion air.
B. low amount/current of combustion air.
C. preheated secondary air.
D. very little excess air.

Answer: Option A

Explanation:

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