Q44 of 87 Page 106

Why does a goldsmith blow air into the kerosene lamp flame with a blow-pipe?

A goldsmith blows air into the kerosene lamp flame with a blow pipe so that complete combustion of fuel takes place and the temperature of the flame increases. He blow the outermost zone of a flame with a metallic blow pipe for melting gold and silver because this is the hottest part of the flame.


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42

Give two examples each of:

(a) solid fuels


(b) liquid fuels


(c) gaseous fuels

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Name the various zones of a candle flame. Which zone(or part) of a candle flame is the least hot(or coldest)?

 45

In which zone of a candle flame:

(a) partial combustion of fuel takes places, and


(b) complete combustion of fuel takes place?

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Explain how, the use of CNG in automobiles has reduced pollution in cities.