Michigan Mechanic Certification- Hvac 42 Correctly Answered Questions Latest Update

Purpose of a compressor {Ans: Low pressure gas enters and high pressure gas leaves}Ambient temperature switch purpose {Ans: Monitors temperature by increasing or decreasing with resistance as temperature changes}Cooling system leak diagnosis {Ans: Pressure test or dye test}What is operating pressure of high side pressure? {Ans: High pressure should be between 170psi-230psi}Effect of outside temperature & humidity on a system {Ans: Temperature and pressure are directly related. The higher the ambient temp, the higher your AC pressures will be. Higher pressure's will lead to a higher outlet vent temperature. Essentially, the air conditioning system does not work as well under extreme heat and humid conditions}What replaced R-12 {Ans: R-134a}