Small domestic refrigerators and freezers use:
A) Flooded evaporators. B) A-coils.
C) Plate evaporators. D) Tube-in-tube evaporators.
[Ques. 2] What two pieces of information are necessary to measure the TEV superheat?
A) The evaporator inlet and outlet temperatures
B) The liquid line and suction line temperatures
C) The valve body temperature and the bulb temperature
D) The suction line temperature and pressure
[Ques. 3] What can happen if you do not purge with nitrogen while brazing?
A) You run the risk of an explosion.
B) Oxides inside the pipe can come loose and contaminate the system.
C) Leak checking will take longer.
D) The brazing will take longer without the extra heat from the nitrogen.
[Ques. 4] What is the purpose of purging with nitrogen while brazing?
A) To help the flame burn a little hotter
B) To check for leaks at the same time you are brazing
C) To blow the oxides off the walls before it has a chance to firmly adhere
D) To prevent oxide formation inside the pipes
[Ques. 5] The most efficient operation is achieved with:
A) Thermostatic expansion valves. B) Orifice-type metering devices.
C) Automatic expansion valves. D) Capillary tubes.
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