Chemical Engineering - Fuels and Combustion

1. 

The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.

A. lower than
B. higher than
C. same as
D. not related to

Answer: Option A

Explanation:

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2. 

Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3)?

A. Producer gas
B. Carburetted water gas
C. Natural gas
D. Liquified petroleum gas

Answer: Option D

Explanation:

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3. 

Which of the following is coking ?

A. Vitrain
B. Fussain
C. both (a) & (b)
D. Neither (a) nor (b)

Answer: Option A

Explanation:

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4. 

Undercharging of coal in the by-product coke ovens results in

A. decrease in the c.v. of coke oven gas.
B. increase in its throughput.
C. increase in the c.v. of coke oven gas.
D. no change in the c.v. of coke oven gas.

Answer: Option A

Explanation:

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5. 

During the carbonisation of coal

A. all tar is evolved at < 600°C.
B. evolution of H2 and formation of methane and aromatics occur at > 700°C.
C. hard semi-coke starts shrinking at 600°C.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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