F Gas Exam [ACTUAL EXAM] LATEST VERSION [QUESTIONS AND ANSWERS]
WITH PRACTICE EXAM DETAILED AND VERIFIED FOR GUARANTEED PASS-
LATEST UPDATE 2025 GRADED A
The EC F Gas Regulations 517/2014 requires refrigeration systems containing > 50 and
< 500 of an HFC refrigerant without an automatic leak detector to be leak tested? -
CORRECT ANSWER 6 monthly
Which of the following TEV superheat settings is likely to cause refrigeration system
hermetic compressor to run continuously and overheat? - CORRECT ANSWER 20K
Under the F Gas Regulations when should a newly installed system be checked for
refrigeration leakage? - CORRECT ANSWER Immediately after being put into service
The residual flux that is left on the outside of a brazed joint must be removed because?
- CORRECT ANSWER The flux absorbs water from the air and corrodes the
pipework
What pipe diameter is least likely to fail when carrying out the strength test using OFN?
- CORRECT ANSWER 1 inch
Which one of the following effects would result in an increase in system efficiency? -
CORRECT ANSWER A reduction in vapour specific volume
The ODP of the refrigerant R22 is? - CORRECT ANSWER 0.05
What would cause a reduction in the efficiency of a cooling plant? - CORRECT
ANSWER High pressure ratio
Which one of the following would improve the energy efficiency of an air conditioning or
refrigeration system the most? - CORRECT ANSWER Lowering the condensing
temperature and raising the evaporating temperature
Why might a unit short cycle on low pressure control? - CORRECT ANSWER
Refrigerant loss
What refrigerant is covered by the requirements of EC Regulations 517/2014? -
CORRECT ANSWER R404A
What identifies that a system may have lost refrigerant? - CORRECT ANSWER
Bubbles in the sight glass
, The term indirect leak checking refers to? - CORRECT ANSWER The calculation of
the correct operating conditions by taking pressure and temperature readings
To find a suspected refrigerant leak on a freezer room evaporator it's best to? -
CORRECT ANSWER Leak test the evaporator with the unit in shut down
If the fins on the evaporator become blocked what is the result on the suction vapour? -
CORRECT ANSWER Pressure and temperature fall
To calculate the system compression ratio? - CORRECT ANSWER Divide discharge
pressure by suction pressure (gauge)
What would make ice form around a TEV and possibly cause the pipe work damage? -
CORRECT ANSWER Short of refrigerant
A refrigeration system contains a refrigerant at a dew point condition of -25 degrees,
you would like? - CORRECT ANSWER 5k of superheat
The unit measurement of specific volume as found on a pressure empathy chart is? -
CORRECT ANSWER m3/kg
Which would result in an increase in system efficiency? - CORRECT ANSWER
Reduction in specific volume at compressor inlet
Which refrigerant conditions will provide a clear liquid line sight glass? - CORRECT
ANSWER Subcooled liquid
What is reasonable condensing temperature for evaporative condensers? - CORRECT
ANSWER Air on the condenser wet bulb + 10k
What leak detection method will be ineffective on refrigeration systems charged with
zeotropic refrigerant? - CORRECT ANSWER Halide lamp
Which refrigerant has the lowest GWP? - CORRECT ANSWER R32
Using unfiltered/untreated water in a water-cooled condenser will? - CORRECT
ANSWER Raise discharge pressure and raise discharge temperature
What may cause the system to trip out on a High Pressure (HP) switch? - CORRECT
ANSWER Dirty condenser
The EC F Gas Regulations 517/2014 requires refrigeration systems containing >5 and
<50 of an HFC refrigerant without an automatic leak detector to be leak tested? -
CORRECT ANSWER 12 monthly
WITH PRACTICE EXAM DETAILED AND VERIFIED FOR GUARANTEED PASS-
LATEST UPDATE 2025 GRADED A
The EC F Gas Regulations 517/2014 requires refrigeration systems containing > 50 and
< 500 of an HFC refrigerant without an automatic leak detector to be leak tested? -
CORRECT ANSWER 6 monthly
Which of the following TEV superheat settings is likely to cause refrigeration system
hermetic compressor to run continuously and overheat? - CORRECT ANSWER 20K
Under the F Gas Regulations when should a newly installed system be checked for
refrigeration leakage? - CORRECT ANSWER Immediately after being put into service
The residual flux that is left on the outside of a brazed joint must be removed because?
- CORRECT ANSWER The flux absorbs water from the air and corrodes the
pipework
What pipe diameter is least likely to fail when carrying out the strength test using OFN?
- CORRECT ANSWER 1 inch
Which one of the following effects would result in an increase in system efficiency? -
CORRECT ANSWER A reduction in vapour specific volume
The ODP of the refrigerant R22 is? - CORRECT ANSWER 0.05
What would cause a reduction in the efficiency of a cooling plant? - CORRECT
ANSWER High pressure ratio
Which one of the following would improve the energy efficiency of an air conditioning or
refrigeration system the most? - CORRECT ANSWER Lowering the condensing
temperature and raising the evaporating temperature
Why might a unit short cycle on low pressure control? - CORRECT ANSWER
Refrigerant loss
What refrigerant is covered by the requirements of EC Regulations 517/2014? -
CORRECT ANSWER R404A
What identifies that a system may have lost refrigerant? - CORRECT ANSWER
Bubbles in the sight glass
, The term indirect leak checking refers to? - CORRECT ANSWER The calculation of
the correct operating conditions by taking pressure and temperature readings
To find a suspected refrigerant leak on a freezer room evaporator it's best to? -
CORRECT ANSWER Leak test the evaporator with the unit in shut down
If the fins on the evaporator become blocked what is the result on the suction vapour? -
CORRECT ANSWER Pressure and temperature fall
To calculate the system compression ratio? - CORRECT ANSWER Divide discharge
pressure by suction pressure (gauge)
What would make ice form around a TEV and possibly cause the pipe work damage? -
CORRECT ANSWER Short of refrigerant
A refrigeration system contains a refrigerant at a dew point condition of -25 degrees,
you would like? - CORRECT ANSWER 5k of superheat
The unit measurement of specific volume as found on a pressure empathy chart is? -
CORRECT ANSWER m3/kg
Which would result in an increase in system efficiency? - CORRECT ANSWER
Reduction in specific volume at compressor inlet
Which refrigerant conditions will provide a clear liquid line sight glass? - CORRECT
ANSWER Subcooled liquid
What is reasonable condensing temperature for evaporative condensers? - CORRECT
ANSWER Air on the condenser wet bulb + 10k
What leak detection method will be ineffective on refrigeration systems charged with
zeotropic refrigerant? - CORRECT ANSWER Halide lamp
Which refrigerant has the lowest GWP? - CORRECT ANSWER R32
Using unfiltered/untreated water in a water-cooled condenser will? - CORRECT
ANSWER Raise discharge pressure and raise discharge temperature
What may cause the system to trip out on a High Pressure (HP) switch? - CORRECT
ANSWER Dirty condenser
The EC F Gas Regulations 517/2014 requires refrigeration systems containing >5 and
<50 of an HFC refrigerant without an automatic leak detector to be leak tested? -
CORRECT ANSWER 12 monthly
