The preferred method for raising the pressure of a low-pressure chiller in order to test for leaks is:
A) Charging the chiller with R-410A. B) Adding nitrogen to the evaporator.
C) Circulating warm water through the chiller. D) Adding more refrigerant.
[Ques. 2] Why is evacuating a refrigeration system important?
A) Evacuation is the only procedure to ensure that noncondensable gases and moisture are removed from HFC systems with a POE lubricant.
B) Increases in the system high-side pressure and temperature can only be accomplished by proper evacuation.
C) Evacuation increases the system head pressure and compression ratio.
D) Noncondensable gases and moisture, the two most common system contaminants, can be removed through evacuation.
[Ques. 3] If an electric heater is rated at 15,000 W, and the voltage used is 240 V, what size breaker in amps would be required?
A) 62.5 B) 140 C) 75 D) 50
[Ques. 4] Protons are:
A) Negatively charged particles located in the center of the atom.
B) Negatively charged particles located in the outer part of the atom.
C) Positively charged particles located in the outer part of the atom.
D) Positively charged particles located in the center of the atom.
[Ques. 5] How does dye indicate system leaks?
A) The dye reacts with the refrigerant, making the inside of the system glow.
B) Dye makes the refrigerant oil spots more visible.
C) Dye gives the refrigerant a color, so it looks like a psychedelic cloud escaping from the system.
D) The dye highlights small cracks when rubbed over the outside of the joint.
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