Chemical Engineering - Fuels and Combustion

31. 

Which of the following is not a 'manufactured' fuel ?

A. LPG
B. Coal briquettes
C. Tar
D. Colloidal fuels

Answer: Option C

Explanation:

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32. 

Use of excess of combustion air in the combustion of fuels results in

A. heat losses.
B. long flame.
C. condensation of water vapour from the fuel gas.
D. none of these.

Answer: Option A

Explanation:

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33. 

Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?

A. Ash disposal problem.
B. Excessive fly-ash discharge from the stack.
C. High power consumption in its transportation.
D. Erosion of induced draft fan blades.

Answer: Option A

Explanation:

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34. 

Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.

A. Junker's
B. Bomb
C. Boy's
D. none of these

Answer: Option B

Explanation:

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35. 

Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

A. higher calorific value.
B. lower hydrogen content.
C. both (a) and (b).
D. neither (a) nor (b).

Answer: Option D

Explanation:

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