Chemical Engineering - Fuels and Combustion
Exercise :: Fuels and Combustion - Section 4
| 1. |
__________ process is meant for direct hydrogenation of coal to produce liquid fuel. |
| A. |
Fischer-Tropsch | | B. |
Bergius | | C. |
Lurgi | | D. |
None of these |
Answer: Option B
Explanation:
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| 2. |
Producer gas containing least amount of tar is produced by the |
| A. |
partial combustion of coal. | | B. |
partial combustion of large size (< 50 mm) coke. | | C. |
high pressure gasification of coal (e.g. in Lurgi gasifier). | | D. |
atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier). |
Answer: Option B
Explanation:
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| 3. |
Air/gas ratio for complete combustion will be the highest for |
| A. |
LPG | | B. |
gobar gas | | C. |
coke oven gas | | D. |
carburetted water gas |
Answer: Option A
Explanation:
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| 4. |
Beehive coke oven |
| A. |
facilitates by-products recovery. | | B. |
takes 2-3 days for coking of coal but requires no external fuel for heating. | | C. |
gives larger yield of coke (around 85%) as compared to by-product ovens. | | D. |
produces coke with very poor strength. |
Answer: Option B
Explanation:
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| 5. |
Turndown ratio of a gas burner is equal to the |
| A. |
maximum to minimum heat input ratio. | | B. |
maximum to minimum permissible gas flow rate. | | C. |
both (a) & (b). | | D. |
minimum to maximum heat input ratio. |
Answer: Option C
Explanation:
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