QUESTION 7
(a)   List FOUR components that would normally be provided by the gas supplier as part of the
metering set for a domestic dwelling.
 1
 2
 3
 4
(4 marks)
(b)  Describe the opening and closing actions for an automatic safety shut-off valve fitted to an
industrial gas burner train that does not have a separate pilot supply.
 
 
 
(2 marks)
(c)  State FOUR functions of a programmable control unit (PCU) on a package burner.
 1
 2
 3
 4
(4 marks)
QUESTION 7 (cont’d)
(d)   By deleting the incorrect word in each box in the following table, indicate the status of the
equipment in each stage of the operating sequence for an automatic gas burner.   

PLEASE SEE PDF FOR TABLE

(6 marks)

(e)   Sketch a cross section of a device suitable for providing reverse flow protection 
in a gas line. Indicate the normal direction of flow.
(3 marks)

Total 19 marks

Linkback: https://www.plumbers.nz/gas-exam-june-2007/21/question-7/125/