| A-7 Heating and Air Conditioning Certification Practice Test | |
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1. A technician installs a set of A/C gauges on a vehicle with poor A/C performance. The High side is Low and the Low side is High. This indicates a: A Frozen evaporator B Frozen expansion valve C Restricted condenser D Weak compressor |
6. Technician A says oil residue on an A/C hose may indicate a leak in the system. Technician B says its not necessary to replace the small amount of oil lost in the leak. Who is correct? A Technician A B Technician B C Both A and B D Neither Technician A or B |
2. A vehicle blows warm air only when the heater is on high output. Technician A says this could be a restricted heater control valve. Technician B says this could be caused by a low coolant level. Who is correct? A Technician A B Technician B C Both A and B D Neither Technician A or B |
7. Technician A says mineral oil is used to lubricate 134a A/C systems. Technician B says A/C oil mixes with the refrigerant to lubricate the compressor, seals, o-rings etc. in the A/C system. Who is correct? A Technician A B Technician B C Both A and B D Neither Technician A or B |
3. Two technicians are discussing heat transfer in an automotive A/C system. Technician A says as refrigerant converts from a gas to a liquid it receives heat. Technician B says an expansion valve drops the pressure from the liquid line before it enters the evaporator. A Technician A B Technician B C Both A and B D Neither Technician A or B |
8. A vehicle has a High - High Side pressure. All of these can cause this condition except: A Restricted condenser B No fan operation C Overtightened A/C belt D Overcharged system |
4. Technician A says a open A/C relay winding can prevent A/C clutch engagement. Technician B says a loose serpentine belt can prevent clutch engagement. Who is correct? A Technician A B Technician B C Both A and B D Neither Technician A or B |
9. Technician A says a frozen point on an A/C component or connection indicates a restriction in the system. Technician B says a frozen expansion valve will cause a Low - Low side pressure. Who is correct? A Technician A B Technician B C Both A and B D Neither Technician A or B |
5. Technician A says evacuating an A/C system will remove moisture and humidity. Technician B says to evacuate the system any time it's been opened to the atmosphere. Who is correct? A Technician A B Technician B C Both A and B D Neither Technician A or B |
10. Two technicians are discussing the cycling clutch system. Technician A says the temperature cycling clutch switch uses a bulb placed on the inlet port of the evaporator core. Technician B says a typical pressure cycling switch is located on the accumulator or the low side of a system. Who is Correct? A Technician A B Technician B C Both A and B D Neither Technician A or B |
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