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A system can be evacuated to only atmospheric pressure when: ___________.
a) the repair is major
b) the repair is followed by an evacuation of the appliance to the environment
c) leaks in the appliance make evacuation to the prescribed level unattainable
d) the appliance is being disposed - ANSWER ✓ c) leaks in the appliance make
evacuation to the prescribed level unattainable
Moisture is removed from a system by: _________.
a) purging the condenser
b) draining the oil separator
c) reducing water flow to the condenser
d) using a filter drier - ANSWER ✓ d) using a filter drier
When using recovery or recycling equipment that was manufactured AFTER
November 15, 1993: you must evacuate a system containing MORE than 200
pounds of CFC-12 to ________ before making a major repair.
a) 0 psig
b) 4 inches of Hg vacuum
c) 10 inches of Hg vacuum
d) 15 inches of Hg vacuum - ANSWER ✓ d) 15 inches of Hg vacuum
When under a deep vacuum, the motor winding of a hermetic refrigeration
compressor: ________.
a) will be damaged if energized
,b) must be kept warm to operate properly
c) will be protected by its insulation if the compressor is started
d) will overheat only if the crankcase heater is energized - ANSWER ✓ a) will be
damaged if energized
To recover liquid refrigerant, you must connect one hose to the: _______.
a) compressor suction valve
b) compressor discharge valve
c) liquid line
d) top of the condenser - ANSWER ✓ c) liquid line
Your recovery/recycling machine has R-22 refrigerant in it. You now have to
recover refrigerant from a unit with R-410A. What must be done before your
recovery unit can be used to recover R-410A?
a) The recovery unit must be EPA certified for use with R-410A.
b) The recovery tank must be designed for the pressure of R-410A.
c) The filter and lubricant in the recovery unit must be changed, and the recovery
unit evacuated.
d) All of the above. - ANSWER ✓ d) All of the above.
Oil foaming usually occurs in the: _______.
a) condenser
b) evaporator
c) compressor
d) expansion device - ANSWER ✓ c) compressor
Heat pumps that use R-134A should be leak checked with: _______.
a) CFCs
b) HCFCs
c) compressed dry air
d) pressurized nitrogen - ANSWER ✓ d) pressurized nitrogen
After refrigerant liquid has been recovered from a system, any remaining vapor is:
_______.
, a) purged to the atmosphere
b) isolated in the system
c) pumped into the system receiver
d) condensed by the recovery system - ANSWER ✓ d) condensed by the recovery
system
Heat pumps that have been retrofitted from R-22 to R-407C should be leak
checked with: ________.
a) HFCs
b) HCFCs
c) pressurized nitrogen
d) compressed air - ANSWER ✓ c) pressurized nitrogen
When inspecting a system for leaks, you should look for: ________.
a) frost on the pipes
b) puddles of liquid refrigerant
c) particles from the drier core
d) traces of oil - ANSWER ✓ d) traces of oil
Soap bubble testing is used: _________.
a) to pinpoint refrigerant leaks
b) only with CFCs and HCFCs
c) to detect water leaks
d) to see if the condenser or evaporator is excessively dirty - ANSWER ✓ a) to
pinpoint refrigerant leaks
The proper charging method for blended (non-azeotropic) refrigerants (400 Series)
is to remove the charge from the cylinder as a: _____.
a) vapor
b) liquid
c) superheated vapor
d) subcooled liquid - ANSWER ✓ b) liquid
An oil sample should be taken when: _________.