Gas Exam - Part 1

Question 1

Name 11 gases, their specific gravity and symbol.

Answer 1

Hydrogen, H2, 0.07
Methane, CH4, 0.55
Carbon Monoxide, CO, 0.97
Nitrogen, N2, 0.97
Ethylene, C2H4, 0.97
Air, Nil, 1
Ethane, C2H6, 1.04
Oxygen, O2, 1.11
Hydrogen Suplhide, H2S, 1.18
Carbon Dioxide, CO2, 1.52
Nitrogen Dioxide, NO2, 1.6
Sulphur Dioxide, SO2, 2.2

Question 2

What are the constituents of air?

Answer 2

20.95% O2
78.08% NO2
0.04% CO2
0.93% Inert gases
Water vapour varies

Question 3

In regards to oxygen concentration and fires, at what concentrations does O2 extinguish B Class fires?

Answer 3

17%

Question 4

In regards to oxygen concentration and fires, at what concentrations does O2 extinguish A Class fires?

Answer 4

12%

Question 5

In regards to oxygen concentration and fires, at what concentrations does O2 extinguish all combustion?

Answer 5

2%

Question 6

What effect does an O2 enriched atmosphere have on Upper Flammable limit of flammable gases?

Answer 6

Raises the upper flammable limit of a flammable gas