How does a hot-gas defrost system work?
A) Gas flames provide the heat to melt the ice.
B) A warm glycol solution is sprayed on the coil.
C) The superheated gas leaving the evaporator is used to melt the ice.
D) Hot compressor discharge gas is routed to the evaporator.
D
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While discussing the installation of a pressure plate, technician A says that grade 8 can be used for the mounting bolts. Technician B says that you need to move from bolt to bolt at least two times while tightening the bolts. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
Select boars that are from sows that rank in the top _____ percent of a herd as measured by a Sow
Productivity Index
a. 5 c. 20 b. 10 d. 25
A refrigerant sensor that changes conductivity when exposed to refrigerant is:
A) Photoacoustic infrared (PIR). B) Diffusion infrared. C) Ceramic metal oxide semi-conductor (CMOS). D) Infrared nondispersive (NDIR).
Which of the following is an incorrect statement?
A) A CFC or HCFC refrigerant recovered from a system can be returned to the same system. B) When opening a sealed system, CFC or HCFC refrigerant must be recovered and stored in approved containers. C) Anyone releasing CFC or HCFC refrigerants to the atmosphere is subject to fines and the possibility of a jail term. D) CFC or HCFC refrigerant recovered from one system can be used in another system, regardless of system ownership.