Type 1 Small Appliance– Practice Test 3

If you are recovering refrigerant from a frost-free refrigerator, you should

cool the compressor to force liquid out of the high side.

turn on the defrost heater to vaporize any trapped liquid.

heat the recovery cylinder to vaporize liquid refrigerant.

pack ice around the evaporator to ensure maximum liquid is available.

When checking for the existence of nondensable gases inside a recovery cylinder, why is it proper procedure to allow the temperature of the cylinder to stabilize at room temperature before taking a pressure reading?

Deselect Answer

Because it is a quick method of determining refrigerant level inside the tank.

Because any comparisons to a pressure-temperature chart is only valid if both the pressure and temperature of the refrigerant are stable.

To prevent safety valves from purging excess refrigerant.

Because a temperature reading alone is enough to determine refrigerant quality.

Whenever nitrogen is used to pressurize or blow debris out of a system, the nitrogen

Deselect Answer

must be recovered.

Nitrogen can only be used if mixed with R-22.

can be vented.

Nitrogen should never be used.

If a reclamation processing plant is given a recovery tank containing a mixture of refrigerants, they can

Deselect Answer

refuse to process the refrigerant and return it.

agree to destroy the refrigerant, but typically a substantial fee is charged for this.

Both A and B

resell the refrigerant for reuse in its current state.

Refrigerant recovery devices must be equipped with low-loss fittings. Low-loss fittings are used to

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connect the recovery device to an appliance and are manually or automatically closed to prevent refrigerant loss when connecting/disconnecting hoses.

connect the recovery device to and appliance so that only a small loss of refrigerant takes place.

None of the above.

connect the recovery device to an appliance and have to be discarded after use.

Recovery or recycling equipment which was manufactured after November 1 1993, and is used to recover refrigerant from small appliances must be used to

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recover 95 percent of the refrigerant from the appliance whether or not the compressor is functional.

recover 90 percent of the refrigerant from the appliance if the appliance compressor is operational.

Both B and C.

recover 80 percent of the refrigerant from the appliance if the appliance compressor is inoperable.

The sale of refrigerants is

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banned.

restricted to technicians who are EPA certified in refrigerant recovery.

limited by law to equipment owners.

allowed only if there is proof of need.

A recovery cylinder which is half full of recovered R-410a at 90F, in the absense of noncondensables, will be pressurized to

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100 psig

300 psig

400 psig

200 psig

Which refrigerants can be mixed?

Deselect Answer

R-22 and R-410a

Refrigerants can never be mixed.

R-12 and R-500

R-12 and R-134a

When transporting refrigerants, DOT (Department of Transportation) Regulation number 49 CFR requires _________ to be recorded on the shipping papers for hazard class 2.2, Nonflammable Compressed Gases.

Deselect Answer

Number of cylinders of each gas.

Total cubic feet of each refrigerant.

Volume of each cylinder.

Total weight of all cylinders.

If a large leak of refrigerant occurs in an enclosed area and no self-contained breathing apparatus is available, the technician should then

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vacate and ventilate the area.

put on a dust mask and butyl-lined gloves and try to stop the leak.

put on a dust mask and use a leak detector to locate the leak and try to stop it.

All of the above

When recovering refrigerant from a household refrigerator where the compressor does not run, it is recommended that low side and high side access valves be installed because ___________.

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otherwise the refrigerator compressor may be damaged.

it may be necessary in order to achieve required recovery efficiency.

it can enhance the speed of recovery.

Both A and B

A recovery cylinder which is half full of R-12 at normal room temperature, about 75F, in the absence of non-condensibles, will be pressurized to

Deselect Answer

30 psig

200 psig

75 psig

150 psig

When using nitrogen, the nitrogen tank should always be equipped with a

Deselect Answer

hand valve.

regulator.

yellow top.

level sensor.

To avoid accidental removal of liquid refrigerant when recovering vapor from a system, using a self-contained (active) recovery device that cannot handle liquid refrigerant, you should draw vapor from the

Deselect Answer

All of the above.

capillary tube.

high side.

low side.

If you install an access fitting on to a sealed system,

Deselect Answer

the fitting does not need to be leak tested until the total repair is completed.

the system must be pressurized with dry nitrogen before leak testing can be performed.

the fitting should be leak tested before proceeding with recovery.

it is not necessary to leak test the access fitting.

TYPE 1

SMALL APPLIANCE

PRACTICE TEST 3

ARE YOU READY?

LET’S PRACTICE!