When connecting a gauge manifold set, the air inside the hoses and gauge manifold:
A) Is removed by connecting a vacuum pump to the gauges before connecting them.
B) Is neutralized by adding chemical buffers to the system annually.
C) Is negligible and will not adversely affect the system.
D) Is removed by purging.
[Ques. 2] All refrigerants with a three-digit number starting with the number 4 are:
A) Refrigerant blends. B) Zeotropic blends. C) Compounds. D) Refrigerant effects.
[Ques. 3] The heat of compression can be determined using:
A) The enthalpy difference from the beginning to the end of the compressor line.
B) The enthalpy difference from the beginning to the end of the metering device line.
C) The enthalpy difference from the beginning to the end of the condenser line.
D) The enthalpy difference from the beginning to the end of the evaporator line.
[Ques. 4] What controls when Schrader valves open and close?
A) They open when hoses with depressors are connected to them.
B) They open and close by a wireless Bluetooth signal.
C) They open every time the unit starts up and close immediately upon shutdown.
D) They open when they are backseat cracked and close when they are backseated.
[Ques. 5] The required system capacity in tons can be determined by dividing:
A) 100 BTU/min by the system's refrigeration effect.
B) 200 BTU/min by the system's refrigeration effect.
C) 300 BTU/min by the system's refrigeration effect.
D) 600 BTU/min by the system's refrigeration effect.
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