Type 2 High Pressure– Practice Test 2

When a refrigerant trace gas becomes absolutely necessary to use, which of the available refrigerants should be used to identify a leak?

Deselect Answer

HFC-410a

HCFC-22

HFC-407c

CFC-12

After refrigerant liquid has been recovered from a system, any remaining vapor is

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condensed by the recovery system.

purged to the atmosphere.

isolated in the system.

pumped into the system receiver.

An oil sample should be taken when

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the compressor has burned out.

the unit is not cooling properly.

a new filter dryer has been installed.

recycled refrigerant has been added to the unit.

In a refrigeration system with a TXV or other type of throttling device, the component directly following the condenser would be the

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metering device.

accumulator.

evaporator.

receiver.

Recovered refrigerant may contain which of the following?

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Moisture

All of the above

Oils

Acids

The backseating of a suction shut-off valve will close the

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compressor port.

compressor and gauge port.

suction line and compressor port.

gauge port.

Which repair would always be considered “major” under the EPA’s regulations?

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Replacement of a filter dryer.

Replacement of a condenser fan motor.

Replacement of a schrader valve core.

Replacement of an evaporator coil.

R-410a requires certified recovery and recycling equipment rated for at least

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240 psig

500 psig

300 psig

400 psig

A compressor heater is used to

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reduce the amount of refrigerant in the lubricating oil.

prevent acid pitting.

remove entrained water.

prevent refrigerant vaporization.

Your recovery/recycling machine has R-502 refrigerant in it. You now have to recover refrigerant from a unit with R-22. What must be done before the R-22 refrigerant can be recovered/recycled?

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Nothing as long as the recovery machine is not full.

Change the expansion valve on the recovery machine.

Change the filter and expansion valve on the recovery machine.

Recover as much of the R-502 as possible from the recovery machine, change the filter, and evacuate.

The fastest way to recover refrigerant from a system is to remove it in the _______ phase.

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liquid

initial

vapor

final

Before using a recovery unit to remove a charge, what steps should be taken?

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Check the oil level in the recovery unit.

All of the above.

Evacuate recovery unit and recovery tank.

Check service valve positions.

A deep vacuum is usually measured in

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psia

microns

inches of Hg

psig

Before transferring refrigerant to an empty cylinder

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the refrigerant should be chilled.

the cylinder should be evacuated to avoid mixing air with the recovered refrigerant.

the cylinder should be heated.

the refrigerant should be mixed.

To recover liquid refrigerant, you must connect one hose to the

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liquid line.

top of the condenser.

compressor suction valve.

compressor discharge valve.

A system can be evacuated to only atmospheric pressure when

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leaks in the appliance make evacuation to the prescribed level unattainable.

the repair is followed by an evacuation of the appliance to the environment.

the appliance is being disposed.

the repair is major.

The vacuum pump used to evacuate a system should be capable of pulling a vacuum of

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500 microns

1000 microns

10mm Hg

20mm Hg

While R-410a is a high-pressure refrigerant, it can be stored in the back of your service van as long as

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the temperature inside the vehicle does not exceed 125F. But R-22 can be stored in vehicles with temperatures exceeding 125F.

the temperature inside the vehicle does not exceed 155F. But R-22 can be stored in vehicles with temperatures exceeding 155F.

the temperature inside the vehicle does not exceed 125F. This is the same guidance given for R-22 and other common refrigerants.

the temperature inside the vehicle does not exceed 155F. This is the same guidance given for R-22 and other common refrigerants.

When under a deep vacuum, the motor winding of a hermetic refrigeration compressor

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must be kept warm to operate properly.

will be damaged if energized.

will be protected by its insulation.

will overheat only if the crankcase heater is energized.

Which statement is NOT true regarding recycling and recovery equipment manufactured after November 15 1993?

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It must meet vacuum standards more stringent than those met by equipment manufactured before 15 November 1993.

It must be tested by an EPA approved third party.

It must be equipped with low-loss fittings.

It must have an oil separator.

When a unit is opened for servicing, the ________ should always be replaced.

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metering device

crankcase heater

filter-drier

thermostat

When servicing an operating unit that has a receiver/storage tank, the

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compressor should be isolated off.

gauge pressure should be achieved by venting.

refrigerant should be recovered into the receiver.

liquid should be recovered last.

Use ________ to remove ice from a sight glass.

Deselect Answer

a screw driver or flat file

R-11 refrigerant

water

an alcohol spray

The refrigerant pressure inside an R-12 unit which is at room temperature (72F) and not operating is

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approximately 154 psig

approximately 214 psig

approximately 304 psig

approximately 74 psig

You are going to service a newer residential split-system air-conditioner. You would expect to find the system charged with which refrigerant?

Deselect Answer

R-410a

R-11

R-502

R-12

TYPE 2

HIGH PRESSURE

PRACTICE TEST 2

ARE YOU READY?

LET’S PRACTICE!