Fuel, Combustion and Flames

Fuels, Combustion and Flame Worksheet-4

1. L.P.G used as domestic fuel is mixed with a strong smelling volatile liquid known as Ethyl Mercaptan for:

(a) better combustion                 (b) good smell/fragrance

(c) detection of gas leakage        (d) higher calorific value

2. Which of the following has the characteristics of a good fuel?

(a) Coke             (b) Butane         (c) Coal              (d) Kerosene

Fuels, Combustion and Flame Worksheet-5

1. Which of the following has the highest calorific value?

(a) Petrol           (b) Coke             (c) Natural gas (d) Kerosene

2. Which of the following has the characteristics of a good fuel?

(a) Coke             (b) Butane         (c) Coal              (d) Kerosene

3. The process of burning a substance in the presence of air with the evolution of heat is called:

(a) distillation                               (b) carbonisation

Fuels, Combustion and Flame Worksheet-6

1. Which of the following is an example of rapid combustion?

(a) Candle                                      (b) Cracker

(c) White phosphorus                 (d) None

2. Fire is extinguished by:

(a) removing all combustible substance

(b) cutting off supply of air

(c) cooling the burning substance

(d) all of these