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Test Bank For Modern Refrigeration and Air Conditioning 21st Edition by Andrew 2
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Test Bank For Modern Refrigeration and AirConditioning 21st Edition by Andrew D. Althouse, Carl
H. Turnquist, Alfred F. Bracciano, Daniel C. Bracciano,
Gloria M. Bracciano
How are refrigerant leaks detected? - ANSWER By use of an electronic tester or
by the soapsuds test method
Can refrigerant gases ever be mixed? - ANSWER no
Which Naval Ship Technical Manual (NSTM) chapter will give you
specific information on the operation and maintenance of refrigeration systems? -
ANSWER 516
Which type of lube oil system is found on high speed refrigerant compressors? -
ANSWER Force-feed lubricating
Which speed do high speed centrifugal refrigerant compressors operate at? -
ANSWER 1,500 RPMs
Which type of material is refrigerant piping made out of? - ANSWER 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? - ANSWER 4-12F
which detrimental effect will occur if the Thermostatic Expansion Valve (TXV) is
misadjusted and gives an excessive temperature range? - ANSWER 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? - ANSWER Frosting Back
Which system discharge pressure is the refrigerant water regulating valve set to
maintain? - ANSWER 125 psig
What is the first indication of a refrigerant shaft seal failure? - ANSWER Oil
leakage
What should never be done when installing a new refrigerant shaft seal? -
ANSWER 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? - ANSWER 670
, Which manner must refrigerant bottles always be stored in? - ANSWER In a cool,
dry place, in an upright position firmly anchored
What is the maximum temperature that refrigerant bottles should be exposed
to? - ANSWER 130F
Why are refrigerants considered to be deadly? - ANSWER Halocarbons
Which series contains safety precautions for forces afloat when dealing with
refrigerants? - ANSWER OPNAVINST 5100.19
Which measurement is the capacity of a refrigeration plant always expressed in? -
ANSWER Tons of refrigerant
The refrigerant liquid strainer is designed to protect what? - ANSWER The
solenoid valves and TXV
Which type of switch automatically stops a refrigerant compressor when a failure of
circulating water supply occurs? - ANSWER Water failure
Which type of refrigerant is replacing R-ll and R-12 systems? - ANSWER R-134
What is the allowable monthly leakage rate of the total refrigerant charge minus the
reported accidental or unintentional releases? - ANSWER 35%
How often is testing of refrigerant systems for leaks accomplished IAW PMS? -
ANSWER Semi-annually
What is not permitted in the vicinity of performing recovery of refrigerant? -
ANSWER Hot work
Refrigerant usage logs must be kept when the refrigeration plant holds how many or
more pounds of refrigerant? - ANSWER 50
How often at a minimum must refrigerant usage logs be reviewed? - ANSWER
Monthly
What controls the capacity of a refrigerant compressor? - ANSWER Cylinder
unloading and loading
Where is the compressor capacity control valve located? - ANSWER Compressor
crankcase cover
what actuates the compressor capacity control valve? - ANSWER Oil pressure
Which pressure is the compressor pumped down to when testing the compressor
discharge valves for proper operation? - ANSWER 2 psig
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