Air Conditioning Testing and Service Part A

Question 1

When you are using any refrigerant or working on an air conditioning system, you must always wear:
a. safety glasses
b. safety glasses with side shields
c. a face shield
d. one of the above mentioned methods of eye protection.

Answer 1

d. one of the above mentioned methods of eye protection.

Question 2

The maximum allowable filling limit for any refrigerant container is:
a. 65% of it’s internal volume
b. 75% of it’s internal volume
c. 80% of it’s internal volume
d. 90% of it’s’ internal volume

Answer 2

c. 80% of it’s internal volume

Question 3

A refrigerant identifier (vapor analyzer) is a diagnostic instrument designed to evaluate vapor samples directly from the air conditioning system. The analyzer is able to:
a. identify and measure the purity of air conditioning system refrigerants.
b. determine the percentage of air ( a non condensable gas) contained in the air conditioning system.
c. prevent the filling of refrigerant recovery bottles with mixtures of refrigerants.
d. all of the above

Answer 3

d. all of the above

Question 4

The manifold gauge set’s __________ register the pressure in the range of 0-150 psi, which is present in the left hand hose.

Answer 4

low pressure (blue)

Question 5

The purpose of using a high-capacity vacuum pump when servicing an air conditioning system is to remove the moisture and air that is hidden in the hoses and components of a closed air conditioning system.
True
False

Answer 5

True

Question 6

When exposed to an open flame, refrigerants that contain fluorocarbons break down and produce:
a. a cooling effect.
b. dangerous poisonous vapors.
c. hydrocarbon based refrigerants.
d. water vapour and steam.

Answer 6

b. dangerous poisonous vapors

Question 7

It is acceptable to recover different types of refrigerants into the same container, as long as you can re-use it afterwards.
True
False

Answer 7

False

Question 8

The manifold gauge set’s _______________ registers the pressure registers the pressure

Answer 8

High pressure gage (RED)

Question 9

The manifold gauge set’s center mounted utility hose can be used to:

Answer 9

a. recover refrigerant from the system.
b. pressure test the a/c system.
c. Recharge the a/c system.

Question 10

A micron gauge can be used to accurately measure ___________________ that has been reached in the air conditioning system as it is being evacuated.

Answer 10

the level of vacuum.

Question 11

If a bubble crimp produced on a bead lock fitting is properly centered and looks regular, you can check it’s accuracy with the use of a ____________.

Answer 11

micrometer

Question 12

The bent fins of the air conditioning condenser and evaporator can be straightened by the use of a __________.

Answer 12

fin comb

Question 13

A damaged or loose __________________ can cause a refrigerant leak large enough to render an air conditioning system useless in a matter of hours.

Answer 13

schrader valve core

Question 14

Quality troubleshooting and service procedures always start with a ___________ of the HVAC system.

Answer 14

visual inspection

Question 15

The first step in diagnosing the source of an HVAC cooling problem is to ______________

Answer 15

gather information

Question 16

If the HVAC visual inspection has eliminated the cab heating system from being the cause of the cooling malfunction, but has not helped to isolate the air condition problem, you should conduct an air conditioning system ________________

Answer 16

performance test

Question 17

Properly operating air conditioning system temperature and pressures vary with ________________________

Answer 17

ambient temperature, humidity levels and condenser size.

Question 18

If a blockage to refrigerant flow (internal restriction) occurs inside the air conditioning system, ________ system pressures will result.

Answer 18

low

Question 19

A malfunctioning air conditioning _________ will cause you to observe higher than normal low side pressure readings, lower than normal high side pressure readings and high temperature readings in HVAC duct airflows.

Answer 19

compressor

Question 20

__________ pressure readings can be caused by two or more refrigerants mixed inside the air conditioning system.

Answer 20

High

Question 21

Dirt and debris lodged in the condenser fins will cause ___________________ operating air conditioning system pressure readings.

Answer 21

higher than normal.