Question

124
Define 'calorific value of a fuel'.129
State any two characteristics of an ideal fuel. 129
Why is water not used in controlling electrical fires? 126
nswer the following questions.
Draw a diagram showing the different zones of candle flame. Label the zone
which contains: 127
(a) unburnt vapours of wax.
(b) unburnt carbon particles.
Calorific value of wood is 18,000 kJ/kg. How much of wood is required to
produce 360,000 kJ of heat energy?
134​

Answer 1

Answer:

1). Calorific value or heat of combustion of a fuel is the amount of heat developed by a fuel when completely burned.

2). It should possess high calorific value.

    It should have proper ignition temperature.

3). We cannot use it to control electric fires as it has a high tendency to carry electricity along itself and thus can be harmful. we do not use water in controlling electrical fires because water is a good conductor of electricity. ... therefore, to prevent this, water is not used in controlling electrical fires.

5). Claorfic value of wood is=18000kj/kg

Required to produce =360000kj/kg

36000/18000kj/kg=20

: Your answer is 20kj/kg

4). Answer :-