Chemical Engineering - Fuels and Combustion
Exercise :: Fuels and Combustion - Section 2
| 16. |
High ash coals |
| A. |
are soft & friable (poor strength and size stability). | | B. |
require longer time of carbonisation as ash offers resistance to heat transfer. | | C. |
produce larger quantity of coke oven gas. | | D. |
none of these. |
Answer: Option B
Explanation:
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| 17. |
Which of the following is not a by-product fuel ? |
| A. |
Pitch | | B. |
Blast furnace gas | | C. |
Petrol | | D. |
Refinery gas |
Answer: Option C
Explanation:
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| 18. |
Preheating of combustion air is done to |
| A. |
increase the adiabatic flame temperature. | | B. |
increase the calorific value of the fuel. | | C. |
complete the combustion of fuel. | | D. |
reduce its requirement for effecting the complete combustion. |
Answer: Option A
Explanation:
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| 19. |
Gross heating value of coal is __________ the net heating value. |
| A. |
higher than | | B. |
lower than | | C. |
same as | | D. |
either (a) or (b); depends on the type of coal |
Answer: Option A
Explanation:
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| 20. |
Anthracite can be used for |
| A. |
recarbonising steel. | | B. |
making carbon electrodes; | | C. |
blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke. | | D. |
all (a), (b) and (c). |
Answer: Option D
Explanation:
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