uduc.
7. Name the unit in which the calorific value of a fuel is expressed.
8. Explain how CO, is able to control fires.
9. It is difficult to burn a heap of green leaves but dry leaves catch fire easily.
Explain.
10. Which zone of a flame does a goldsmith use for melting gold and silver
and why?
41. In an experiment 4.5 kg of a fuel was completely burnt. The heat produced
was measured to be 180,000 kJ. Calculate the calorific value of the fuel.
Discuss
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Answers
Answer:
kilojoule
7.Fuel Efficiency
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value. The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg).
8.Carbon dioxide extinguishes work by displacing oxygen, or taking away the oxygen element of the fire triangle. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well.
9.
Green leaves have a lot of chlorophyll and moisture in them. This moisture does not allow them to catch fire easily when a heap of green leaves are burnt. However, dry leaves have no moisture or water content in them. Therefore, the heap of dry leaves catch fire easily.
10.
A goldsmith uses the outer part of the candle flame for melting gold and silver. This is because in this zone of flame, the temperature is the highest helping these metals to melt easily.
41.The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel. Answer: Total mass of fuel = 4.5 kg Total heat produced = 180,000 kJ Heat produced by burning 1 kg of fuel = 180,000 kJ/4.5 kg = 40,000 kJ/kg.
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