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hvac
hvac t
| Question | Answer |
|---|---|
| the heat added to a vapor causing it to become warmer is called? | superheat |
| A change in pressure can affect the blank of a subastance | vaporization and condesation |
| all of the following are reasons why a flooded evaporator will not cool well except | the refrigerant vaporizes too quickly |
| the clean air act became law when | 1990 |
| tech a says the cooling system must be full for a pressure test to be effective. tech b says the cooling system should never be pressurized beyond the pressure cap rating. whos correct | both |
| the two basic design types of radiators are | down flow and cross flow |
| tech a says that the recommended oil for most R-134a systems is pag oil. tech b says that the recommended oil for R-12 systems is mineral-based oil.who is correct? | both |
| tech a says that both the vapor and the liquid tank valves on the recovery unit should be open. tech b says that both the high side and low side gauge valves on the manifold and gauage set should be open.whos correct? | both |
| if a thermostat fails in the open position all of the following will occur except | a loss of engine coolant |
| all of the following statements about heat transfer are true except. | some of the molecules give up thier energy to other molecules that have more energy |
| refrigerant analyzers or identifiers are being discussed. tech a says if the analyzer displays R-134a then the refigerant is 98 percent pure.tech be says if HC is displayed then the refrigerant is flammable who is correct? | both |
| tech a says you should always disconnect the power source while working on electric cooling fan motors, tech b says it is safe to work on electric cooling motors when the ignition switch is off. whos correct | A only |
| under normal operating conditions all of the following occurs inside the evaporator except: | the refrigerant changes from a vapor to a liquid |
| tech a says convection may occur in liquids and gases, tech b says conduction can occur between two substances that are different temps.. whos correct | both |
| when making system repairs install the receiver drier or accummulator when | last |
| tech a says that latent heat cant be felt, tech b says latent heat cant be measured with a thermometer whos correct | both |
| where in the system is the receiver dryer located | on the outlet of the condenser |
| all of the following statements about the air conditioning circuit are true except | on the low pressure side the change is from a vapor to a liquid |
| if a system has a thermostatic expansion valve it will also have all of the following parts except | accumulator |
| all of the following statements about the system evacuation are true except | vacuum pump efficiency is increased at higher altitudes |
| the metering device changes high pressure liquid into a | low pressure liquid |
| tech a says there are several condenser designs and flow paths in use today. tech b says the only paths for refrigerant thr the condensers tubing is the parallel cross flow. whos correct | tech a |
| the ideal relative humidity is between 40 and 60 precent | the ideal relative humidity is between 40 and 60 percent |
| tech a says the radiator outlet is connected to the water pump inlet by a rubber hose. tech b says the thermostat is usally located at the engine coolant outlet.whos correct | both |
Created by:
tdry28