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Chemical Engineering - Fuels and Combustion

Exercise

"I do not seek. I find."
- Pablo Picasso
1. 

Higher efficiency in the combustion of solid fuel can not be achieved by
A. proper fuel preparation.
B. keeping the flue gas exhaust temperature very high.
C. adopting efficient-fuel firing technique & equipment.
D. supplying correct quantity of combustion air.
2. 

A coal containing very high percentage of durain is called __________ coal.
A. brightB. splint
C. non-bandedD. boghead
3. 

During combustion of gaseous fuels, deficiency of air
A. lengthens the flame.
B. tends to shorten the flame.
C. does not affect the flame length.
D. increases the flame temperature.
4. 

Gross and net calorific value of a fuel will be the same
A. if its ash content is zero.
B. ifits carbon content is very low.
C. if its hydrogen/hydrogen compound content is zero.
D. under no circumstances.
5. 

Low temperature carbonisation
A. is mainly for producing the smokeless domestic coke.
B. is meant for the production of 'metallurgical coke'.
C. produces higher quantity of gas than high temperature carbonisation.
D. produces less quantity of tar than high temperature carbonisation.

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