F Gas Exam Test Questions and Answers Rated A
The condition of the refrigerant entering the expansion
High pressure sub cooled liquid
device is?
The indications of a refrigerant leak on a refrigeration The evaporator superheat is high with bubbles in the
system is most likely if the following has been observed? liquid line sight glass
The EC F Gas Regulations 517/2014 requires refrigeration
systems containing > 50 and < 500 of an HFC refrigerant 6 monthly
without an automatic leak detector to be leak tested?
Which of the following TEV superheat settings is likely to
cause refrigeration system hermetic compressor to run 20K
continuously and overheat?
Under the F Gas Regulations when should a newly in-
Immediately after being put into service
stalled system be checked for refrigeration leakage?
The residual flux that is left on the outside of a brazed joint The flux absorbs water from the air and corrodes the
must be removed because? pipework
What pipe diameter is least likely to fail when carrying out
1 inch
the strength test using OFN?
Which one of the following ettects would result in an
A reduction in vapour specific volume
increase in system eflciency?
The ODP of the refrigerant R22 is? 0.05
What would cause a reduction in the eflciency of a cooling
High pressure ratio
plant?
Which one of the following would improve the energy
Lowering the condensing temperature and raising the
eflciency of an air conditioning or refrigeration system the
evaporating temperature
most?
Why might a unit short cycle on low pressure control? Refrigerant loss
What refrigerant is covered by the requirements of EC
R404A
Regulations 517/2014?
1/5
, F Gas Exam Test Questions and Answers Rated A
What identifies that a system may have lost refrigerant? Bubbles in the sight glass
The calculation of the correct operating conditions by tak-
The term indirect leak checking refers to?
ing pressure and temperature readings
To find a suspected refrigerant leak on a freezer room
Leak test the evaporator with the unit in shut down
evaporator it's best to?
If the fins on the evaporator become blocked what is the
Pressure and temperature fall
result on the suction vapour?
To calculate the system compression ratio? Divide discharge pressure by suction pressure (gauge)
What would make ice form around a TEV and possibly
Short of refrigerant
cause the pipe work damage?
A refrigeration system contains a refrigerant at a dew point
5k of superheat
condition of -25 degrees, you would like?
The unit measurement of specific volume as found on a
m3/kg
pressure empathy chart is?
Which would result in an increase in system eflciency? Reduction in specific volume at compressor inlet
Which refrigerant conditions will provide a clear liquid line
Subcooled liquid
sight glass?
What is reasonable condensing temperature for evapora-
Air on the condenser wet bulb + 10k
tive condensers?
What leak detection method will be inettective on refrig-
Halide lamp
eration systems charged with zeotropic refrigerant?
Which refrigerant has the lowest GWP? R32
Using unfiltered/untreated water in a water-cooled con- Raise discharge pressure and raise discharge tempera-
denser will? ture
What may cause the system to trip out on a High Pressure
Dirty condenser
(HP) switch?
2/5
The condition of the refrigerant entering the expansion
High pressure sub cooled liquid
device is?
The indications of a refrigerant leak on a refrigeration The evaporator superheat is high with bubbles in the
system is most likely if the following has been observed? liquid line sight glass
The EC F Gas Regulations 517/2014 requires refrigeration
systems containing > 50 and < 500 of an HFC refrigerant 6 monthly
without an automatic leak detector to be leak tested?
Which of the following TEV superheat settings is likely to
cause refrigeration system hermetic compressor to run 20K
continuously and overheat?
Under the F Gas Regulations when should a newly in-
Immediately after being put into service
stalled system be checked for refrigeration leakage?
The residual flux that is left on the outside of a brazed joint The flux absorbs water from the air and corrodes the
must be removed because? pipework
What pipe diameter is least likely to fail when carrying out
1 inch
the strength test using OFN?
Which one of the following ettects would result in an
A reduction in vapour specific volume
increase in system eflciency?
The ODP of the refrigerant R22 is? 0.05
What would cause a reduction in the eflciency of a cooling
High pressure ratio
plant?
Which one of the following would improve the energy
Lowering the condensing temperature and raising the
eflciency of an air conditioning or refrigeration system the
evaporating temperature
most?
Why might a unit short cycle on low pressure control? Refrigerant loss
What refrigerant is covered by the requirements of EC
R404A
Regulations 517/2014?
1/5
, F Gas Exam Test Questions and Answers Rated A
What identifies that a system may have lost refrigerant? Bubbles in the sight glass
The calculation of the correct operating conditions by tak-
The term indirect leak checking refers to?
ing pressure and temperature readings
To find a suspected refrigerant leak on a freezer room
Leak test the evaporator with the unit in shut down
evaporator it's best to?
If the fins on the evaporator become blocked what is the
Pressure and temperature fall
result on the suction vapour?
To calculate the system compression ratio? Divide discharge pressure by suction pressure (gauge)
What would make ice form around a TEV and possibly
Short of refrigerant
cause the pipe work damage?
A refrigeration system contains a refrigerant at a dew point
5k of superheat
condition of -25 degrees, you would like?
The unit measurement of specific volume as found on a
m3/kg
pressure empathy chart is?
Which would result in an increase in system eflciency? Reduction in specific volume at compressor inlet
Which refrigerant conditions will provide a clear liquid line
Subcooled liquid
sight glass?
What is reasonable condensing temperature for evapora-
Air on the condenser wet bulb + 10k
tive condensers?
What leak detection method will be inettective on refrig-
Halide lamp
eration systems charged with zeotropic refrigerant?
Which refrigerant has the lowest GWP? R32
Using unfiltered/untreated water in a water-cooled con- Raise discharge pressure and raise discharge tempera-
denser will? ture
What may cause the system to trip out on a High Pressure
Dirty condenser
(HP) switch?
2/5
