Leak Detection

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Question 1

What is an indication of a refrigerant leak in an air conditioning system?

A	Oil trace around copper fittings
B	Excessively high discharge pressures
C	High discharge-line temperatures
D	Low suction-line temperatures

Question 2

What is commonly used to pressurize an air conditioning system for the purpose of leak detection?

A	Air
B	Nitrogen with a trace amount of R-22
C	Nitrogen with a trace amount of R-12
D	Nitrogen mixed with oxygen

Question 3

When testing for a leak in an air conditioning system,

A	The system must be pressurized and electrically de-energized
B	The system must be in full operation except for the condenser fan
C	The system must be in full operation except for the indoor blower
D	Only the compressor must be energized

Question 4

If air is trapped in an air conditioning system it has a tendency to stay in the

A	Evaporator
B	Compressor
C	Condense
D	Metering device

Question 5

When pressurizing an air conditioning system for the purpose of leak detection, the pressure in the system must never exceed

A	The high-side test pressure rating
B	The low-side test pressure rating
C	500 psig
D	500 psia

Question 6

When pressurizing a system during a leak test, what must never be used?

A	Carbon dioxide
B	Nitrogen
C	R-22
D	Oxygen

Question 7

What must be used when pressure testing a system with nitrogen?

A	A vacuum pump and charging cylinder
B	A recovery system
C	A pressure regulator and an in-line pressure-relief valve
D	No accessories are needed to use nitrogen on a system

Question 8

How long must an air conditioning system operate after adding a refrigerant dye for leak detection?

A	1 hr
B	10 hr
C	15 hr
D	24 hr

Question 9

Which leak detector is the most accurate and is used on systems with extremely small R-22 leaks?

A	Halide leak detector
B	Soap bubbles
C	Smoke test method
D	Electronic leak detector

Question 10

When using an electronic leak detector,

A	The probe must be held below the tubing being tested
B	The probe must be held above the tubing being tested
C	The probe must be held pointing in the down position for an accurate reading
D	The probe must be held pointing in the up position for an accurate reading

Question 11

When is it inadvisable to use a halide leak detector?

A	On a system that uses halogenated fluorocarbons
B	On an inoperative system
C	Near flammable materials
D	On a system that contains 10 lb of refrigerant or more

Question 12

When using a halide leak detector, what color will the flame be when it is in the presence of a small refrigerant leak?

A	Blue
B	Green
C	Red
D	Purple

Question 13

An ultrasonic leak detector senses a leak by?

A	Radar
B	Excessive refrigerant concentration
C	Sound waves
D	Chemical reaction

Question 14

An ultrasonic leak detector senses a leak on a system that

A	Is under a positive pressure only
B	Is under a negative pressure only
C	Is under a positive or a negative pressure
D	Uses CFC refrigerants only

Question 15

What is commonly added to a system when using an ultraviolet light leak detector?

A	A UV additive
B	Nitrogen
C	A red dye additive
D	A fluorescent additive

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Leak Detection

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