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MACHINIST MATE AC&R UPDATED Exam Questions and CORRECT Answers

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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

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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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