Hydrocarbon Quiz

Which of the following will occur if R290 leaks from a system into an enclosed area?

• it will immediately evenly disperse throughout the area

• It will initially accumulate at a high level

• It will immediately dissolve into the air

• It will initially accumulate at a low level

Which of the following is R290?

• Pentane

• Propane

• Propene

• Propylene

Which one of the following standards provides information regarding the training of engineers who work with hydrocarbon refrigerants?

• EN 378

• EN 5750

• EN 60079

• EN 14276

Why should a standard (open) klaxon not be fitted on a hydrocarbon refrigerant compressor?

• It could be a source of ignition in the event of a refrigerant leak

• The current consumption is greater than for HFC systems

• Hydrocarbon compressors cannot be overloaded because of the lower density of the refrigerant

• The compressor motors have a different motor winding configuration

What additional safety device is typically fitted to an R290 chiller compared to an R407C chiller?

• A hydrocarbon leak detection system

• A halocarbon leak detection system

• A staged pressure relief system

• Triple pressure relief valves

What is the radius of a safe work area when charging a hydrocarbon refrigerant system?

• 0.5 m

• 3 m

• 6 m

• 9 m

What does a ventilation fan for hydrocarbon refrigerant have that differs from a standard fan?

• An ex rated fan motor and long mains cable

• An induction fan motor

• An air flow rate of at least 20 m/s

• An EC fan motor

What is the most accurate method of charging a 150 g hydrocarbon system?

• Charge until the sight glass is clear

• Charge using scales with an accuracy of +/- 1g

• Charge until the superheat is between 4 K and 8 K

• Charge to a frost line on the suction pipe

Why are line tap valves not suitable when evacuating an HC refrigeration system?

• A line tap valve could leak, introducing air into the system

• A line tap valve is not suitable for use with liquid HC refrigerant

• Line tap vales only work on positive pressures

• You do not need to evacuate a HC refrigeration system

If a HC cylinder has to be stored inside a building, which factors are the most important in deciding the storage area?

• Above ground, secured location, ground level leak detection, remote from sources of ignition

• Below ground, secure location, low level leak detection, remote from sources of ignition

• Non public area, below ground, low level leak detection, remote from sources of ignition

• Store with other flammable gas cylinders in any area