Deck 11: Leak Testing

Question 1

The leak detection method that is widely accepted in the field for performing a leak-check on a newly installed, assembled or repaired system is the __________.

A) electronic leak detector test
B) halide leak detector test
C) vacuum test
D) standing pressure test

Answer 1

D

Question 2

A relative humidity over __________ greatly increases the chances of allowing mold to grow in the occupied space.

A) 40%
B) 50%
C) 60%
D) 70%

Answer 2

C

Question 3

With the soap bubble method of leak detection,

A) larger leaks typically produce large bubbles
B) smaller leaks typically produce small bubbles
C) smaller leaks typically produce large bubbles
D) small leaks produce no bubble at all

Answer 3

C

Question 4

The desired relative humidity in an occupied space is in the __________% to __________% range, with ___________% being ideal.

Question 5

Via the use of a small internal pump, air is pushed out of the electronic leak detector and, if refrigerant is detected, the audible tone that the detector emits will change.

Question 6

The pressure that is used during the standing pressure test must not exceed the __________ factory test pressure.

A) average
B) highest
C) lowest
D) median

Question 7

The electronic leak detector has the ability to locate leaks as small as __________ ounce per year.

A) 0.125
B) 0.25
C) 0.5
D) 0.55

Question 8

To comply with laws set forth by the EPA, the technician should __________ pressurize a system for leak-checking purposes with 100 percent refrigerant.

A) always
B) never
C) occasionally
D) often

Question 9

Typically, the electronic leak detector emits a slow beeping sound that increases in __________ depending on the amount of refrigerant detected.

A) frequency
B) pitch
C) tone
D) volume

Question 13

The __________ method of leak detection is primarily used on systems that have already been put into service,

A) electronic leak detector
B) halide leak detector
C) ultrasonic leak detector
D) ultraviolet leak detector

Question 14

Air conditioning and refrigeration systems are intended to operate with the correct amount of refrigerant to help ensure efficient operation. List six problems that can result if a system operates from a deficiency of refrigerant.

Question 15

Systems should not be leak-tested by pulling the unit into a vacuum.

Question 16

Leak-checking a system prior to startup is an absolute must, especially when refrigerant lines are to be __________.

A) brazed
B) flared
C) sealed behind walls or ceilings
D) soldered

Question 18

Provide the formula by which The relative humidity is calculated.

Question 19

When a soap bubble solution is used to detect leaks in a system, the solution is __________ or __________ onto the piping circuit, primarily at __________. The formation of bubbles indicates that __________.

Question 20

After determining a safe pressure at which to perform the standard pressure test, the system can be pressurized. Nitrogen is a great choice for accomplishing this for what two reasons?

Question 21

List the steps for performing the standing pressure test, in the proper order.

Question 22

With the standing pressure test, the __________ the system stays under pressure, the more reliable the leak-check will be. On residential systems, __________ should be more than sufficient time for even the smallest leak to cause movement on the gauge. If at all possible, the system should be under pressure __________ to ensure that the system is leak-free prior to startup. If a _________ leak is present, the pressure in the system will begin to drop rapidly. __________ leaks may require much more time to show up on the gauge.

Question 23

Explain why leak testing a system is often one of the most difficult tasks a service technician can face.