Fuel, Combustion and Flames

Fuels, Combustion and Flame Worksheet-7

1. In soda - acid extinguisher, the bottle contains:

(a) H₂SO₄          (b) NaHCO₃      (c) NaOH           (d) HCl

2. The metallic cylinder in soda-acid extinguisher contains:

(a) NaOH          (b) NaHCO₃      (c) Al (OH)₃      (d) KOH

3. The type of combustion in which heat, light and sound are produced is:

(a) rapid                                         (b) explosive

Fuels, Combustion and Flame Worksheet-8

1. Arrange the following fuels in increasing order of their calorific value:

1 – Petrol

2 – Diesel

3 – Kerosene

4 – Natural gas

(a) 1, 2, 3, 4       (b) 2, 3, 4, 1       (c) 2, 1, 3, 4       (d) 2, 3, 1, 4

2. Incomplete combustion of a fuel gives:

(a) CO                (b) CO₂               (c) SO₂               (d) oxides of nitrogen

Fuels, Combustion and Flame Worksheet-9

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

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

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

2. Hydrogen gas has the highest calorific value i.e., 150 kJ/kg yet it is not used as a fuel. The reasons are:

(a) it is explosive in nature

(b) it causes storage problem

(c) it causes transportation problem

(d) all of these