Valves that open and close rapidly under the control of electronic circuits are:
A) Step motor valves. B) Pulse-modulated valves.
C) Electronic expansion valves. D) Cross-charged expansion valves.
[Ques. 2] Which of the following statements is TRUE regarding a brazing project on a 3/16 in pipe with a 3 tip, the acetylene and oxygen regulators set at 7 psig, and that begins with heating the pipe first?
A) The oxygen regulator should be below 6 psig.
B) The pipe should not be heated first while brazing.
C) The acetylene regulator should be below 6 psig.
D) The tip size is incorrect for a 3/16 in pipe.
[Ques. 3] The discharge, liquid, and suction lines of a packaged unit are:
A) Located on top of the unit. B) Located inside the unit.
C) Located outside the unit. D) Not necessary.
[Ques. 4] Which type of condenser is on the back of a non-frostfree refrigerator?
A) A forced-draft air-cooled condenser B) A natural-draft air-cooled condenser
C) An induced-draft air-cooled condenser D) A packaged air-cooled condenser
[Ques. 5] The presence of noncondensables in a refrigerant recovery cylinder can be detected by:
A) Checking the acidity of the refrigerant with litmus paper.
B) Testing to see if the gas on top of the cylinder will burn.
C) Comparing the actual cylinder weight to the cylinder water capacity.
D) Comparing the cylinder pressure and temperature to a PT chart.
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