Gas Tradesman Exam Questions 1

Which of the following is the correct name for AS/NZS 3604:2011?
Gas Appliance Safety
Storage and handling of LP Gas
Gas verification
Pipe materials
Timber framed buildings
What is the main constituent of natural gas?
Methane
Propane
Butane
Hexane
Pentane
Butane is part of which family of gases?
1st family
2nd family
3rd family
4th family
5th family
What TWO main elements occur in both natural gas and LPG
Hydrogen and Nitrogen
Carbon and Hydrogen
Propane and Butane
Nitrogen and Oxygen
Hydrogen and Oxygen
Gases are classified into families. What does it mean if two gases are in the same family?
The gases require similar Pressures to change state from gas into liquid
The vaporisation points of the gases are within 25oC of each other ensuring even dilution of molecules once in a gas state
The gases were seperated after being excrtacted from the same well source
There is the possibility to interchange between the gases without the need to change injecor size
There is not more than 1 kg/m3 difference in density between the gases
The thermocouple produces an electrical current. Which reading would you expect to read on a multi-meter then testing a thermocouple?
Between 20 and 35 Watts
Between 20 and 35 Amps
Between 20 and 35 Volts
Between 20 and 35 mA
Between 20 and 35 mV
What can occur within an appliance that has an efficiency exceeding 85%?
Flame cooling
Vitiation due to low flue temperatures
Condensation
Excessive carbon dioxide creation
Excessive flame noise and lift
Which statement best describes a thermistor?
A vapour, or liquid filled sensing vial
A bimetallic temperature operated switch
An electronically controlled capacitor
A temperature dependant resistor
A mercury temperature sensing bulb
Why are heating outlets from ducred warm air furnaces permitted to be installed in small bedrooms and bathrooms?
The ducting can be altered to restrict flow
Convection heating cannot distribute carbon dioxide
The combustion portion of the heater is room sealed
Adequate ventilation is provided by the return air grille
The air entering the room is filtered
What is the maximum permissible length of a restraint chain on an appliance that is​ designed to be slid out for servicing?​
75% of the length of the hose assembly
80% of the length of the hose assembly
85% of the length of the hose assembly
90% of the length of the hose assembly
95% of the length of the hose assembly
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