Epa Exam, Type 3

Front 1

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 1

15 %

Front 2

During vapor removal from a low pressure refrigeration system;

Back 2

the system water pumps, the recovery compressor, and the recovery condenser water should all be on.

Front 3

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

Back 3

Replacement of an evaporator coil.

Front 4

EPA regulations require that leaking commercial and industrial process refrigeration be repaired when the leak rate exceeds ________ percent of the charge per year.

Back 4

35 %

Front 5

When leak testing a low pressure centrifugal with nitrogen, what is the maximum test pressure?

Back 5

10 psig.

Front 6

Where would you place a leak detector probe to check gas leaks into the water box with water removed?

Back 6

Through a drain valve.

Front 7

When removing oil from a low pressure system, the temperature should be 130 degrees F because;

Back 7

less refrigerant will be contained in the oil at the higher temperature.

Front 8

Why do chillers using CFC-11 and HCFC-123 require purge units?

Back 8

System operates below atmospheric pressure.

Front 9

R-11 or R-123 system refrigerant removal starts with;

Back 9

liquid removal.

Front 10

Charged low pressure refrigeration machines may be most efficiently leak checked by;

Back 10

raising system pressure by heating with circulated hot water or heating blankets.

Front 11

Charging refrigerant liquid into a refrigeration system under a 29 inch Hg vacuum can cause the;

Back 11

refrigerant liquid to freeze.

Front 12

What is the primary water source for a recovery unit condensing coil?

Back 12

Local municipal water supply.

Front 13

A hydrostatic tube test kit will;

Back 13

determine if a tube leaks.

Front 14

A centrifugal chiller's rupture disk is connected to the chiller's;

Back 14

evaporator.

Front 15

How do you determine when enough vapor has entered the refrigeration system before you charge refrigerant liquid?

Back 15

Refrigerant saturation temperature increases to 36 degrees F.

Front 16

When using recovery or recycling equipment manufactured BEFORE November 15, 1993, technicians must evacuate low-pressure appliances to the following level before making a major repair:

Back 16

25 inches of Hg vacuum.

Front 17

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

Back 17

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 18

Appliances need not be evacuated all the way to the prescribed level when;

Back 18

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

Front 19

The PRIMARY purpose of a purge unit on a CFC-11 chiller is to;

Back 19

remove non-condensables from the system.

Front 20

When using recovery and recycling equipment manufactured AFTER November 15, 1993, technicians must evacuate low-pressure appliances to the following level before disposing of the appliance:

Back 20

25 mm of Hg absolute.

Front 21

Under EPA's regulations, which of the following methods can be used to pressurize an R-11 or R-123 system for the purpose of opening the system for a non-major repair?

Back 21

Adding nitrogen.

Front 22

ASHRAE Standard 15 - 1994 requires the use of room sensors and alarms to detect;

Back 22

refrigerant leaks.

Front 23

Under what code group of ASHRAE Standard 34 does R-123 fall?

Back 23

B1.

Front 24

Approximately how much refrigerant vapor is left in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid has been removed?

Back 24

100 lbs.

Front 25

Refrigerant-11 at a pressure of 18.1 inches Hg vacuum has a saturation temperature of;

Back 25

32 degrees F.