Chemical Engineering - Fuels and Combustion

21. 

The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorifice value will be

A. y
B. 0.95 y
C. 1.05 y
D. 1.8 y

Answer: Option A

Explanation:

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22. 

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3 ), while the C.V. is same on weight basis (i.e., kcal/kg) ?

A. Propane and acetylene
B. Propane and LPG
C. Sewage gas and gobar gas
D. B.F. gas and coke oven gas

Answer: Option A

Explanation:

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23. 

One kg of carbon for theoretically complete combustion requires __________ kg of air.

A. 11.5
B. 0.5
C. 23
D. 12

Answer: Option A

Explanation:

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24. 

If CO2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as

A. O2
B. CO
C. N2
D. SO2

Answer: Option D

Explanation:

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25. 

By-products are __________ recovered in 'Beehive ovens'.

A. fully
B. partially
C. not at all
D. negligibly

Answer: Option C

Explanation:

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