Refrigeration oils must be miscible with the system refrigerant because:
A) The system depends on the refrigerant to carry the oil throughout the system to lubricate all the refrigeration components.
B) The compressor cannot operate properly without liquid refrigerant in the crankcase.
C) The system depends on the refrigerant to return the oil to the compressor.
D) The system depends on the oil to return the refrigerant to the compressor.
C
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Extra-long power luffing jibs can have all of the following features except _____.
a. forestays and backstays b. one or more jib masts c. separate counterweights for the jib backstays d. manually-set offset angles
It is important to the HVACR technician to understand the changes of state of matter because:
A) NATE certification exams require a good understanding of the Periodic Table of Elements. B) The refrigerant recovery process requires a technician to know which state the matter is in to ensure that only like refrigerants are put into a recovery container. C) Technicians are required to mix refrigerants to attain proper pressures and temperatures when charging refrigeration systems. D) The cooling and heating process requires a change of state of matter in some form.
When its entire cooling needs are met through storage, the system is
A) chilling and discharging. B) charging. C) live load chilling. D) discharging.
On a GTAW torch, to change an electrode or adjust its stickout, the welder loosens the _____
a. electrode back cap b. nozzle gasket c. retaining cup d. gas nozzle