MACHINIST MATE AC&R UPDATED Exam Questions and CORRECT Answers
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Course
MACHINIST MATE
Institution
MACHINIST MATE
MACHINIST MATE AC&R UPDATED
Exam Questions and CORRECT Answers
How are refrigerant leaks detected? - Correct Answer- By use of electronic tester or soapsuds
method
Can refrigerant gases ever be mixed? - Correct Answer- No
Which NSTM chapter will give you specific info on the operation and ma...
MACHINIST MATE AC&R UPDATED
Exam Questions and CORRECT Answers
How are refrigerant leaks detected? - Correct Answer- By use of electronic tester or soapsuds
method
Can refrigerant gases ever be mixed? - Correct Answer- No
Which NSTM chapter will give you specific info on the operation and maintenance of
refrigeration systems? - Correct Answer- 516
Which type of lube oil system is found on high speed refrigerant compressors? - Correct
Answer- Force Feed lubricating
Which speed do high speed centrifugal refrigerant compressors operate at? - Correct Answer-
1,500 RPMS
Which type of material is refrigerant piping made out of? - Correct Answer- ACR seamless
copper piping
TXVs are set to maintain a superheat of what? - Correct Answer- 4-12 degrees
Which detrimental effect will occur if the TXV is misadjusted and gives an excessive
temperature range? - Correct Answer- Cooling coil will become starved
Which term is defined as the appearance of frost on the suction line extending as far back as
the compressor? - Correct Answer- frosting back
Which system discharge pressure is the refrigerant water regulating valve set to maintain? -
Correct Answer- 125 psig
What is the first indication of a refrigerant shaft seal failure? - Correct Answer- Oil leakage
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