Chemical Engineering - Fuels and Combustion

21. 

Calorific value of tar is about __________ Kcal/kg.

A. 8800
B. 12000
C. 5000
D. 16000

Answer: Option A

Explanation:

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22. 

Efficiency of the combustion of a fuel is judged by the __________ the flue gas.

A. %of CO2 in
B. % of O2in
C. temperature of
D. colour of

Answer: Option B

Explanation:

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23. 

Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

A. 50
B. 1000
C. 5000
D. 10000

Answer: Option A

Explanation:

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24. 

Rate of low temperature oxidation of coal due to bad storage conditions

A. decreases with increase in surface area.
B. does not vary with increase in surface area.
C. is more for low volatile coal compared to high volatile coal.
D. is accelerated by storage in large heaps with small surface to volume ratio.

Answer: Option D

Explanation:

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25. 

Pick the odd man out.

A. Briquettes
B. Wood
C. Oil gas
D. Pitch creosote mixture

Answer: Option B

Explanation:

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