Epa Exam Type 2

Front 1

Testing with soap bubbles is used;

Back 1

to pinpoint refrigerant leaks.

Front 2

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?

Back 2

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

Front 3

What should be done before transferring refrigerant to an empty cylinder?

Back 3

The cylinder should be evacuated.

Front 4

EPA regulations require that all appliances containing more than 50 pounds of refrigerant (except for commercial and industrial process refrigeration) be repaired when the leak rate exceeds ___________ percent of the charge per year.

Back 4

15 %

Front 5

Many refrigeration units use an open compressor. Which part of the compressor is most likely to leak if a unit is not used for several months?

Back 5

The rotating shaft seal.

Front 6

When using recovery and recycling equipment manufactured BEFORE November 15, 1993, technicians must evacuate an appliance containing 10 pounds of CFC-500 to the following level before disposing of the appliance:

Back 6

4 inches of Hg vacuum.

Front 7

Which of the following repairs would ALWAYS be considered "major" under EPA's regulations?

Back 7

Replacement of an evaporator coil.

Front 8

With an air-cooled condenser on the roof of a building and the evaporator on the first floor, recovery should first occur;

Back 8

from the liquid line entering the evaporator.

Front 9

Removal of the refrigerant charge from a system can be conducted more quickly by;

Back 9

packing the recovery vessel in ice.

Front 10

When first inspecting a hermetic system known to be leaking, you should look for;

Back 10

traces of oil.

Front 11

After installation of a field-piped split system, the unit should first be;

Back 11

pressurized with nitrogen/leak checked.

Front 12

Which of the following statements is NOT true of recycling and recovery equipment manufactured AFTER November 15, 1993?

A. It must be tested by an EPA-approved third party.

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

C. It must be equipped with low-loss fittings.

D. It must have an oil separator.

Back 12

NOT TRUE

D. It must have an oil separator.

Front 13

You are changing out the compressor of a system containing 40 pounds of R-502. Your recycling equipment was manufactured AFTER November 15, 1993. In addition to isolating the compressor as much as possible, which of the following procedures should you follow?

Back 13

Evacuate the isolated section of the system to 10 inches of vacuum and hold. If system pressure does not rise, remove the compressor.

Front 14

Recovering refrigerant from a system in vapor phase will minimize loss of;

Back 14

oil.

Front 15

Non-condensables in a refrigeration system result in;

Back 15

higher discharge pressure.

Front 16

After reaching the required recovery vacuum on an appliance, you should;

Back 16

wait for at least a few minutes to see if the system pressure rises, indicating that there is still refrigerant in liquid form or in the oil.

Front 17

In general, what is one routine maintenance task which must be performed on most refrigerant recycling machines?

Back 17

Change oil and filter.

Front 18

Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. The refrigerant;

Back 18

can probably be charged back into the system.

Front 19

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

A. Check service valve positions.

B. Check recovery unit oil level.

C. Evacuate recovery unit/receiver.

Back 19

D. All of the above.

Front 20

When using recovery and recycling equipment manufactured AFTER November 15, 1993, technicians must evacuate an appliance component containing MORE than 200 pounds of CFC-12 to the following level before making a major repair:

Back 20

15 inches of Hg vacuum.

Front 21

Appliances containing CFC refrigerants can be evacuated to atmospheric pressure when;

Back 21

the appliance is being disposed.

Front 22

For what refrigerant(s) is an equipment room refrigerant monitor required under ASHRAE Standard 15?

A. R-12.

B. R-134a.

C. R-11.

Back 22

D. All of the above.

Front 23

Refrigerant should be removed from the condenser outlet when;

Back 23

the condenser is below the receiver.

Front 24

Moisture is removed from the refrigerant in a system by;

Back 24

using a filter drier.

Front 25

Every refrigerating system shall be protected by;

Back 25

a pressure relief device.

Front 26

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Back 26

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