Q5 of 269 Page 121

Define ignition temperature of a fuel.

The lowest temperature at which a combustible substance when heated catches fire in air and continues to burn is called ignition temperature.


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3

“The calorific value of cooking gas (LPG) is 50 kj/g”. What does it mean?

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Which of the following produces more heat (per unit mass) on burning? Coal or LPG

 6

“The ignition temperature of a fuel is 800 C”. What does this mean?

 7

Fill in the following blank with a suitable word:

The amount of heat produced by burning a unit mass of a fuel completely is known as its---value.