Multichoice Tradesman Gas

74問 • 1年前

問題一覧

A soaker flashing is required to be installed on a flue penetrating a roof which of the following standards is the NZBC clause that provides an acceptable solution for the installation?

Which of the following gives the purpose of a flame retention device?

To prevent flame lift off

According to NZS 5601 P1, What basic identification colour paint must be used to identify natural gas pipework if the pipework is painted?

Buff

According to NZS 5601 P1, what is the minimum horizontal clearance required between a balanced flue terminal and a gas meter fitted with a venting regulator?

800mm

What can occur within an appliance that has an energy efficiency exceeding 85%?

Condensation

According to NZS 5601 P2, what is the minimum clearance between installed gas piping and any electrical service?

25mm

According to NZS 5601 P2, what is the minimum distance allowed between a fuel filler cap and a gas appliance with a permanent pilot (or its vent) In a motorhome?

1000mm

Which of the following is the closets conversion of 28,000 BTU/Hr?

30Mj

what is the minimum height at which work being carried out becomes notifiable works?

Which is the minimum period of time a gasfitting trainee holding a limited certificate work in the presence of his/hers supervisor?

12 Months

Accourding to the health and safety in employment regulations, what term is used for work that is more dangerous than usual?

Notifiable work

LPG is part of which family of gas?

3rd family

What is the gas to air ratio for complete combustion for natural gas?

10:1

What is the relative density of LPG?

1.55

Which of the following will shit off the gas supply in the event of a mechanical ventilation failing to operate?

Fan interlock

Which formula is used to calculate metre correction factor for pressure?

(101.3 + Supply Pressure) / 101.3

Which of the following is likely to cause an appliance regulator to make a chattering noise?

The regulator breather hole has been enlarged

Which of the following is the vaporisation temperature for butane?

0 c

Accourding to NZS 5601 P1, what minimum clearance must there be between an open flue terminal and another flue terminal?

200mm

accourding to NZS 5601 P1, what is the maximum permitted gas consumption of an appliance where a twin wall flue is to be used in a cavity wall in a domestic location?

50Mj/h

Accourding to the Gas (Safety and measurement) Regulations, what does the abbreviation GSC Stand for?

Gas Safety Certificate

What device found in lpg pigtails and regulators limits the amount of gas flow to prevent a large accumulation of gas in the even of a leakage?

Excess flow device

Which of the following best describes the term vitilation?

The contamination of air supply to a burner by the products of combustion

Which of the following is equivalent to 8 KW?

28.8MJ

Accourding to NZS 5601 P1, what is the maximum flue gas temperature at which PVC-U pipe may be used as a flue?

60 c

when not specified in the appliance manufacturers instructions, what is the minimum height a natural draught flue can have?

1.2m

accourding to NZS 5601 P1, an exhaust duct is required to be fitted to a gas laundry dryer if the gas consumption exceeds which of the following?

10Mj/h

Which of the following would cause gas to escape from the breather hole on an appliance regulator?

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?

Natural draught appliances

according to NZS 5601 P1, what is the maximum length of a restraint chain on an appliance that is designed to be slid out for servicing?

80% of the length of the hose assembly

which of the following situations would be most likely to activate the high limit switch on a laundry dryer?

a blockage in the lint trap

if a combustible gas detection system is required to be installed on a boat, what is the minimum number of sensors required to be fitted?

Which of the following is not permitted to be used for gas piping in a caravan?

Multilayer proprietary systems

What is a minimum distance gas piping can be installed from an electrical service on a boat?

25mm

As per NZS 5601 P2, What is the minimum length a flexible connection is permitted to be if it is being used for high pressure piping between and lpg cylinder and regulator?

500mm

Which of the following is not permitted to be located inside a caravan?

Quick connect device

in what way does a thermopile differ from a thermocouple?

A thermopile is a collection of thermocouples within one probe

According to NZS 5601 P2, which of the following words makes a statement a recommendation?

Should

Which of the following are present in both natural gas and lpg?

carbon and hydrogen

according to NZS 5601 P2, a cylinder compartment in a caravan must not be able to contain more than which of the following?

two 15kg lpg cylinders

for pipework being installed in a caravan, pipe supports must be provided within what distance from a tee?

150mm

when a caravan fitted with gas appliances requires ventilation, what is the maximum allowable distance between the floor and the low-level ventilation opening?

150mm

according to NZS 5601 P1, what is the maximum diameter hole permitted to be drilled in a joist, unless otherwise specified by the manufacturer?

32mm

according to NZS 5601 P1, except in single occupancy residential premises, above ground consumer piping must be identified when the operating pressure exceeds which pressure?

7kpa

Which government agency administers the gas installation high risk database?

work safe new zealand

the efficiency of a gas appliance can be found by using which calculation?

appliance heat output / heat input

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

the bottom of the wok is impinging on the burner flame

natural gas is part of which family of gases?

2nd family

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

natural draught appliances

biogas consists of methane and which other gas?

carbon dioxide

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

the burner injector size is correct

according to NZS 5601 P1, what is the minimum permissible clearance above an 8MJ/h overhead radiant heater that is installed indoors to a combustible surface?

900mm

according to NZS 5601 P2, what is the minimum possible clearance between the highest part of a gas hob and a range hood constructed of non-combustible materials?

600mm

Which of the following is the correct name for AS/NZ 3604:2011?

Timber framed buildings

What is the main constituent of natural gas?

Methane

Butane is a part of which family of gases?

3rd family

What does it mean if 2 gases are in the same family?

there is a possibility to interchange between the gases without the need to change the injector size

A thermocouple produces an electrical current. Which reading would you expect to read on a multi meter when testing a working thermocouple?

Between 20 - 35 mV

Which statement best describes a thermistor?

a tempature dependant resistor

why are hearing outlets from ducted warm air furnaces permitted to be installed in small bed rooms or bathrooms?

the combustion portion of the heater is room sealed

the burner on a newly installed log hob burns nicely on high but keeps going out when it is turned down to low. What is the most likely reason for this to occur?

the low flame has not been set correctly

Which of the following accourding to NZS 5601 P1, what is the minimum permitted thickness of a concrete precast chimney used for flue gases not exceeding 300•c?

50mm

according to NZS 5601 P1, what is required when a flange joint is to be re-made?

The gasket should be replaced

at what pressure does natural gas require pressure lebeling to be displayed?

1.5kpa

at what pressure does lpg gas require pressure labeling displayed?

3.5kpa

an over pressure shut off is required at what pressure for lpg?

14kpa

an over pressure shut off is required at what pressure for natural gas?

7kpa

What is the gas to air ratio for complete combustion for lpg?

25:1

What is the relative density of natural gas?

0.65

What is the heating value of LPG?

What is the heating value of natural gas?

what is lpg gas pro dominantly made up of?

Propane + Butane

What % of an lpg bottle is full when delivered to allow for vaporisation of the liquid?

80%

What is the boiling point of propane?

-42 c

M#5 Section and Title v2

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M#5 Section and Title v2