Gas Tradesman Exam Questions 4

Which device found in LPG pigtails and regulators limits the amount of gas flow to prevent a large accumulation of gas in the event of a leakage?​
Back-check module
Overpressure relief
Excess flow device
Over pressure shut off
Pressure limiting valve.​
Which of the following best describes the term vitiation?​ ​
The flame of a burner lighting back to the injector
The fluctuation of gas supply due to a highly sensitive regulator spring
The process of combustion products corroding a flue.​ ​
Irregular flame due to decreasing gas supply.​
The contamination of air supply to a burner by the products of combustion. ​ ​
Which of the following is equivalent to 8 kW?​
28.8 MJ
32.2 MJ
68.4 MJ
72.0 MJ
80.0 MJ.​
According to AS/NZS 5601 Part 1, what is the maximum flue gas temperature at which PVC-U (polyvinyl chloride) pipe may be used as flue?​ ​
45°C​
50°C​
55°C​
60°C​
65°C​
When not specified in the appliance manufacturer’s instructions, what is the minimum height a natural draught flue can have?​ ​
0.6 m
0.9 m
1.0 m
1.2 m
1.6 m
According to AS/NZS 5601 Part 1, an exhaust duct is required to be fitted to a gas laundry dryer if the gas consumption exceeds which of the following?​
10 MJ/h
18 MJ/h
20 MJ/h
24 MJ/h.​
40 MJ/h
Which of the following would cause gas to escape from the breather hole on an appliance regulator?​
The regulator adjustment screw cap has been left off.
The seat of the regulator valve has jammed closed.​
The regulator breather hole has been enlarged.​
The regulator is relieving excess pressure.​
The regulator diaphragm has ruptured.​
Which of the following appliance types is most susceptible to adverse effects of air movement caused by the operation of mechanical ventilation systems?​ ​
Balanced flued appliances.​
Natural draught appliances.​
Fan forced appliances.​ ​
Power flued appliances.​
Room sealed appliances.​
According to the Health and Safety in Employment Regulations, what term is used for work​ that is more dangerous than usual?​
Danger work.​
High risk work.​
Notifiable work.​
Restricted work.​
Specialised work.​
LPG is part of which family of gases?​
1st family.​
2ndfamily.​
3rd family
4th family
5th family​
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