Chemical Engineering - Fuels and Combustion

1. 

Coals used for the generation of producer gas should have

A. high caking index.
B. low fusion point of ash.
C. high volatile matter content.
D. very low ash content (8-10%).

Answer: Option C

Explanation:

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2. 

A coal having higher volatile matter content will necessarily have lower

A. ash fusion temperature.
B. calorific value.
C. ignition temperature.
D. caking index.

Answer: Option C

Explanation:

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3. 

Pick out the wrong statement.

A. Percentage of ash in coke produced from medium coking coal is more than that in coal.
B. The calorific value (kcal/Nm3) of coke oven gas reduces on removal of hydrogen from it by cryogenic method.
C. Ash is normally removed as 'flyash' in kopper-Totzek process of coal gasification.
D. Coal based fertiliser plants in India at Talcher (Orissa) and Ramagundam (A.P) employ Kopper-Totzek process of coal gasification.

Answer: Option C

Explanation:

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4. 

Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.

A. 5
B. 25
C. 55
D. 75

Answer: Option B

Explanation:

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5. 

With increases in carbonisation temperature

A. coke even gas yield increases.
B. tar yield increases.
C. hydrogen percentage in the coke oven gas decreases.
D. methane percentage in the coke oven gas increases.

Answer: Option A

Explanation:

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