Gas Tradesman Exam Questions 3

A gas hob has been commissioned and is working correctly. When a wok is used on the gas hob, the bottom of the wok turns black with soot. Which of the following is the most likely cause of this?

The calorific value of the gas has altered.

The bottom of the wok is impinging on the burner flame.

The wok is getting too hot and should be used on a smaller burner.

The wok is positioned beyond the outer cone of the burner flame.

The wok has a copper base which heats too quickly.

Which of the following safety devices will shut off gas supply in the event of mechanical ventilation failing to operate?

Which of the following appliance types is most susceptible to adverse effects of air movement caused by the operation of mechanical ventilation systems?

Which of the following can be confirmed by gas rating an appliance?

The burner injector size is correct.

The appliance efficiency.

Correct air to gas ratio.

The operation of the appliance safety devices

Correct operation of the appliance flue.

According to AS/NZS 5601 Part 1, what is the minimum permissible clearance above an 8 MJ/h overhead radiant heater that is installed indoors to a combustible surface?

According to AS/NZS 5601 Part 1, what colour must natural gas pipes be painted for identification purposes?

According to AS/NZS 5601 Part 2, what is the minimum possible clearance between the highest part of a gas hob and a range hood constructed of non-combustible materials?

In what way does a thermopile differ from a thermocouple?

A thermopile is constructed of a copper coil rather that a platinum one.

The thermopile generates ohms rather than millivolts

The lifespan of a thermocouple is twice that of a thermopile.

The core of a thermopile is removable for servicing.

A thermopile is a collection of thermocouples within one probe.

Gas Tradesman Exam Questions 3

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