Chemical Engineering - Fuels and Combustion

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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