“Calorific value” of fuel:
It is defined as the amount of heat liberated during complete combustion of 1 kg of fuel.
It is expressed in terms of KJ/kg.
Explain higher and lower calorific value of a coal having following composition by mass Carbon 81%,Hydrogen 7%, Oxygen 8%,Nitrogen 2.5%, sulphur 1.5% and remaining is ash Answer : Carbon C = 81% = 0.81 Hydrogen = H2 = 7% = 0.07 Oxygen = O2 = 8% = 0.08 Nitrogen = N = 2.5% = 0.025 Sulphur = S =1.5% = 0.015 Ash = 2.5% = 0.025 Dulong's formula: H.C.V. of coal = 33800 C + 144500 ... = H.C.V.- 9H2 x 2442 KJ / Kg = 36187.5- 9 x 0.07 x 2442 L.C.V. of coal = 34649.04 KJ / Kg ...
The calorific value of fuel is expressed in unit called a) kilojoule per litre c) kilogram per millilitre b) kilogram per gram d) kilo joule per kilogram Answer : d) kilo joule per kilogram...
The unit of calorific value of fuel is __________ . a) Kj /Kg b) J/Kg c)Kj /g d)J/g Answer : a) Kj /Kg...
State four properties of liquid fuel Answer : 1. High calorific value 2. Moderate ignition temperature 3. Low moisture content 4. Low NOx combustible matter 5. Moderate velocity of combustion 6. Products of combustion not harmful 7. Low ... 10. No spontaneous combustion 11. Low storage cost 12. Should burn in air with efficiency....
State any four requirements of good fuel Answer : 1. It should have high calorific value. 2. An ideal fuel should have moderate ignition temperature. 3. Its moisture content should be low. 4. It should evolve large amount of heat when it burnt. 5. Moderate velocity of combustion. 6. Easy to transport 7. Low cost....
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