Air Conditioning and Refrigeration Questions
and Correct Answers
How are refrigerant leaks detected?
✓ ~~~ By use of an electronic tester or by the soapsuds test method
Can refrigerant gases ever be mixed?
✓ ~~~ no
Which Naval Ship Technical Manual (NSTM) chapter will give you
specific information on the operation and maintenance of refrigeration systems?
✓ ~~~ 516
Which type of lube oil system is found on high speed refrigerant compressors?
✓ ~~~ Force-feed lubricating
Which speed do high speed centrifugal refrigerant compressors operate at?
✓ ~~~ 1,500 RPMs
Which type of material is refrigerant piping made out of?
✓ ~~~ ACR seamless copper piping
Refrigerant Thermostatic Expansion Valves (TXV) are set to maintain a superheat
range of how many degrees at the cooling-coil outlet?
, ✓ ~~~ 4-12F
which detrimental effect will occur if the Thermostatic Expansion Valve (TXV) is
misadjusted and gives an excessive temperature range?
✓ ~~~ Cooling-coil will become starved and will operate at reduced efficiency
Which term is defined as the appearance of frost on the suction line extending as far
back as the compressor?
✓ ~~~ Frosting Back
Which system discharge pressure is the refrigerant water regulating valve set to
maintain?
✓ ~~~ 125 psig
What is the first indication of a refrigerant shaft seal failure?
✓ ~~~ Oil leakage
What should never be done when installing a new refrigerant shaft seal?
✓ ~~~ Handling seals with your fingers, surgical gloves should be used for seal
installation
Which Naval Ship Technical Manual (NS TM) chapter should be read before
handling refrigerant bottles?
✓ ~~~ 670
, Which manner must refrigerant bottles always be stored in?
✓ ~~~ In a cool, dry place, in an upright position firmly anchored
What is the maximum temperature that refrigerant bottles should be exposed
to?
✓ ~~~ 130F
Why are refrigerants considered to be deadly?
✓ ~~~ Halocarbons
Which series contains safety precautions for forces afloat when dealing with
refrigerants?
✓ ~~~ OPNAVINST 5100.19
Which measurement is the capacity of a refrigeration plant always expressed in?
✓ ~~~ Tons of refrigerant
The refrigerant liquid strainer is designed to protect what?
✓ ~~~ The solenoid valves and TXV
Which type of switch automatically stops a refrigerant compressor when a failure of
circulating water supply occurs?
and Correct Answers
How are refrigerant leaks detected?
✓ ~~~ By use of an electronic tester or by the soapsuds test method
Can refrigerant gases ever be mixed?
✓ ~~~ no
Which Naval Ship Technical Manual (NSTM) chapter will give you
specific information on the operation and maintenance of refrigeration systems?
✓ ~~~ 516
Which type of lube oil system is found on high speed refrigerant compressors?
✓ ~~~ Force-feed lubricating
Which speed do high speed centrifugal refrigerant compressors operate at?
✓ ~~~ 1,500 RPMs
Which type of material is refrigerant piping made out of?
✓ ~~~ ACR seamless copper piping
Refrigerant Thermostatic Expansion Valves (TXV) are set to maintain a superheat
range of how many degrees at the cooling-coil outlet?
, ✓ ~~~ 4-12F
which detrimental effect will occur if the Thermostatic Expansion Valve (TXV) is
misadjusted and gives an excessive temperature range?
✓ ~~~ Cooling-coil will become starved and will operate at reduced efficiency
Which term is defined as the appearance of frost on the suction line extending as far
back as the compressor?
✓ ~~~ Frosting Back
Which system discharge pressure is the refrigerant water regulating valve set to
maintain?
✓ ~~~ 125 psig
What is the first indication of a refrigerant shaft seal failure?
✓ ~~~ Oil leakage
What should never be done when installing a new refrigerant shaft seal?
✓ ~~~ Handling seals with your fingers, surgical gloves should be used for seal
installation
Which Naval Ship Technical Manual (NS TM) chapter should be read before
handling refrigerant bottles?
✓ ~~~ 670
, Which manner must refrigerant bottles always be stored in?
✓ ~~~ In a cool, dry place, in an upright position firmly anchored
What is the maximum temperature that refrigerant bottles should be exposed
to?
✓ ~~~ 130F
Why are refrigerants considered to be deadly?
✓ ~~~ Halocarbons
Which series contains safety precautions for forces afloat when dealing with
refrigerants?
✓ ~~~ OPNAVINST 5100.19
Which measurement is the capacity of a refrigeration plant always expressed in?
✓ ~~~ Tons of refrigerant
The refrigerant liquid strainer is designed to protect what?
✓ ~~~ The solenoid valves and TXV
Which type of switch automatically stops a refrigerant compressor when a failure of
circulating water supply occurs?
