Chemical Engineering - Fuels and Combustion

31. 

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.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

32. 

Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

A. < 37%
B. >71%
C. in between 37 & 71%
D. none of these

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

33. 

Prime coking coal is always blended with medium or non- coking coal before ear-bonisation

A. to check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls.
B. because, it alone produces unreactive coke.
C. both (a) and (b).
D. neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

34. 

Actual flame temperature is always lower than the adiabatic flame temperature, because there is

A. no possibility of obtaining complete combustion at high temperature.
B. always loss of heat from the flame.
C. both (a) and (b).
D. neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

35. 

Coke oven gas consists mainly of

A. H2, & CH4
B. CO, & CO2
C. H2, & CO
D. CH4, & CO

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.