Module 2.1 Knowledge Questions Flashcards
lf after turning the gas emergency control off, the gas operative is still detecting a smell of gas, the action to take is: …………………………………………………….
Report the escape to the ESP and, if possible, remain on site until they arrive
Which of the following instructions should not be given to a member of the public, who has reported a smell of gas within their property?
a Turn off the emergency/meter control.
b Extinguish all naked flames.
c Turn off all electrical switches.
d Ventilate the property by opening doors and windows.
c Turn off all electrical switches.
A 0.01 % saturation of CO in the bloodstream (the point at which the first symptoms of CO poisoning occur) is equivalent to…..
a) 100 parts per million (ppm)
b) 1000 parts per million (ppm)
c) 10,000 parts per million (ppm)
d) 100,000 parts per million (ppm)
a) 100 parts per million (ppm)
The approximate volumne fo air required for the complete combustion of 3m3 of natural gas is…
a) 20m3
b) 30m3
c) 40m3
d) 50m3
b) 30m3
The Gross Calorific Value of Natural Gas is approx…
a) 38.6 MJ/m3
b) 93.1 MJ/m3
c) 121.8 MJ/m3
d) 212.4 MJ/m3
a) 38.6 MJ/m3
Due to it’s density when natural gas is released in still air it will….
a) rise from the point of release
b) fall from the point of release
c) not leave the installation
d) freeze
a) rise from the point of release
The Products of Combustion from a vitiated natural gas burner will contain…
a) Water vapour only
b) Carbon dioxide and water vapour only
c) Ozone
d) Carbon Monoxide and other products
d) Carbon Monoxide and other products
The flame speed of natural gas is…..
a) 0.46m/s
b) 0.45m/s
c) 0.36m/s
d) 0.25m/s
c) 0.36m/s
If during a routine visit a gas operative discovers a gas escape of 6mbar over a standard two minute test on the installation pipework, and the repair can not be made until the next day, the action required is:
a Turn off the gas at the meter control and arrange to repair next day.
b With the customer’s permission disconnect the supply, label and arrange to repair next day.
c Leave the supply on and ventilate the premises and arrange to repair next day.
d Contact the Gas Emergency Service and arrange to repair next day.
b With the customer’s permission disconnect the supply, label and arrange to repair next day.
A standard atmospheric burner will comprise of…..
a) injector, fan, electrode and transformer
b) Mixing tube, lint arrester and venturi
c) Slide valve, fixed orifice jet and ignition leads
d) injector, venturi, mixing tube and burner head
d) injector, venturi, mixing tube and burner head
CH4 is the chemical symbol for….
a) All hydrocarbon fuels
b) Methane
c) Propoane
d) Butane
b) Methane
The air that is taken by a burner flame in order to complete the combustion process is known as….
a) primary air
b) secondary air
c) tertiary air
d) adventitious air
b) secondary air
The limits of flammability for natural gas are…
a) 2% to 10% gas in air
b) 2% to 9% gas in air
c) 5% to 15% air in gas
d) 5% to 15% gas in air
d) 5% to 15% gas in air
A person suspected of suffering from the early stages of CO poisoning should be advised to…
a) stay inside and shut all doors and windows
b) shut down the appliance suspected of producing the CO and then go outside
c) get into the open air immediately and ventilate with pure oxygen if possible
d) stay inside until the doctor arrives
c) get into the open air immediately and ventilate with pure oxygen if possible
Gas Safety (Installation and Use) Regulation 36 places the responsibility to act safely when discovering gas escapes upon:
a Gas Emergency Service Operative.
b All gas operatives.
c All members of the public.
d Anyone within a, b and c.
d Anyone within a, b and c.
The type of burner which has approximately 50% of the total air added to the gas prior to combustion is called a..
a) bunsen burner
b) non-aerated burner
c) pre-aerated burner
d) post aerated burner
c) pre-aerated burner
The approximate volume of Oxygen required for the complete combustion of 3m3 of natural gas is..
a) 2m3
b) 4m3
c) 6m3
d) 8m3
c) 6m3
If the gas to a burner was supplied at a faster rate than it could burn the result would be ….
a) lightback
b) linting of the venturi
c) flame lift off
d) efficient combustion
c) flame lift off
When a gas escape is reported to a gas operative by a member of the public, the gas operative, it unable to attend to the escape immediately, should:
a Instruct the member of the public to contact the Gas Emergency Service.
b Instruct the member of the public to turn of the gas at the meter control and report the escape to The Gas Emergency Service.
c Arrange to quote for the repair job as soon as possible.
d Contact the emergency services.
b Instruct the member of the public to turn of the gas at the meter control and report the escape to The Gas Emergency Service.
The first priority when dealing with gas escapes is:
a Find the escape.
b Carry out a tightness test.
c Safeguard property.
d Safeguard life.
d Safeguard life.
Carbon Monxoide is …
a) odourless, colourless and non toxic
b) colourless, odourless and extremely toxic
c) one of the deisred products of combustion
d) the name for the chemical symbol CO2
b) colourless, odourless and extremely toxic
