+91-8076753736 support@wiredfaculty.com

Sponsor Area

Combustion And Flame

Question

Wired Faculty App

At airports and petrol pumps hydrocarbon fire extinguishers are used, not the soda-acid fire extinguisher. Why ?

Solution

At airports or petrol pumps the probability of breaking fire from oils are more. In case of fires due to oils, soda-acid fire extinguisher is not successful, because it uses water to cool the combustible substance. But water is lighter than oil and settles down the oil particles and fire cannot be controlled. In such case Hydrocarbon fire extinguisher is used which has turkey red oil, which causes the foaming of carbon dioxide under pressure. The foam covers the surface of burning substance and cuts off the supply of air to control fire.

Some More Questions From Combustion And Flame Chapter

Compare LPG and wood as fuels.

Give reasons :

Water is not used to control the fire involving electrical equipment.

Give reasons :

LPG is a better domestic fuel than wood.

Give reasons :

Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

Make a labelled diagram of candle flame.

Name the unit in which the calorific value of a fuel is expressed.

Explain how CO₂ is able to control fires.

It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.

Which zone of a flame does a goldsmith use for melting gold and silver and why ?

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.

Sponsor Area

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation