QUESTION 8 
(a) State why it is important to ventilate a confined space when there has been a gas leak.


(2 marks)

(b) State TWO characteristics of a gas flame when the primary air is closed off.
1
2
(2 marks)

(c)   State TWO reasons for odourising natural gas or liquefied petroleum gas.
1
2
(1 mark)

(d)  Name the dangerous gas produced when there is incomplete combustion.


(1 mark)

(e) Name the TWO principle constituents of biogas.
1
2
(2 marks)
Total 8 marks

Linkback: https://forum.plumbers.nz/gas-exam-june-2007/21/question-8/124/