HERE, WE HAVE SOME CONCEPTUAL QUESTIONS ON FUEL AND COMBUSTION.
THESE TYPES OF QUESTIONS ARE GENERALLY ASKED IN EXAMINATIONS. WE ARE PROVIDING YOU SOLUTIONS OF VARIOUS PROBLEMS AFTER EVALUATING THE VARIOUS SAMPLE PAPERS AND THE PREVIOUS YEAR QUESTIONS.
1 ) What are fuels ? How they classitied ? List examples of
various types of fuels .
Ans ) A fuel is any material that can be made to react with other substance so that it release energy as heat energy or to used for work .
fuel can be classified into three categories as follows :-
a ) Solid fuels - wood , coal , peat , dung , etc .
b ) liquid fuels - petroleum , diesel , coal, LPG , etc
c)gaseous fuels - Natural gases , Hydrogen , CNG , Coal gas , etc .
2 ) Enumerate the characteristics of a good fuels .
Ans ) Here are some characteristics of good fuel are .
a)High calorific value
b) low moisture content
c ) Moderate Ignition Temperature
d)Low cost
e)Low Non combustible matter
f ) Easy to Transport . . .
g) Moderate velocity of Combustion .
3 ) Name the different varieties of coal . What is proximate and ultimate analysis of coal ?
Ans) There are four types of coal :-
a ) Anthracite :- It is also called hard coal " contains the highest amount of carbon out of all coal ranks ( 86 % - 97 %).It is a brittle texture and lustrous sheen .
b ) Bituminous :-It is also called " soft coal " has slight
low carbon content than anthracite (45 % - 86% ) . The wide range of carbon content in bituminous coal warrant use for both electricity and Steel Production .
c) Subbituminous :- This coal doesn't have the same shiny lusture as higher ranked coal. The carbon content in this coal is
( 35% - 45% ).
d) Lignite : It is also known as" Brown coal " because It is lighter in colour than the higher rankes of coal.It has lowest carbon content out of the all coal ranks (25% - 35% ).And it has a higher moisture content and crumbly texture .
* The proximate only the fixed carbon, volatile matter, moisture and ash percentage in the coal sample given for analysis.
* Ultimate analysis is useful in determining the quantity of air for combustion and volume the composition of combustion gases . It also indicate the various elemental chemical constituents in coal such as sulphur , nitrogen, carbon , hydrogen , oxygen, etc.
4 ) Detine Calorific value of fuel . Differentiate between higher & lower calorific value of fuel .
Ans) The amount of energy produced by the complete combustion of a material or fuel is known as Calorific value . Its SI unit is KG/KJ.
Higher Calositic value ( HCV ) or Higher heating value(HHV) is when 1 kg of fuel is burnt , the heat is obtained by the complete combustion after the products of the combustion are cooled down to room temperature is called as Higher calorific value of fuel.
Lower Calorific value ( COV) or lower heating Value ( LHV ) is when 1 Kg of a fuel es completely burned and the product of combustion are not cooled down or the heat carried away the product of combustion is not recovered and the steam produced in this process is not condensed then the
heat obtain as known as the lower calorific value .
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