Deck 7: Specialized Hvacr Tools

Question 1

The __________ is an essential tool used by the HVAC/R service technician to troubleshoot and evaluate the electric components of an air conditioning, heating or refrigeration system.

A) clamp-on ammeter (COA)
B) carbon monoxide tester (CO tester)
C) u-tube manometer (UTM)
D) volt-ohm milliammeter (VOM)

Answer 1

D

Question 2

A __________ is used to measure very low pressures above the flame in a heating appliance to verify the flow of flue gases up a chimney or vent

A) draft gauge
B) pressure gauge
C) smoke tester
D) vacuum gauge

Answer 2

A

Question 3

The process of containing refrigerant that is removed from systems is called __________.

A) reconstituting
B) recouping
C) recovery
D) recycling

Answer 3

C

Question 4

The stem thermometer is used to measure the temperature of __________.

A) the occupied space
B) the temperature of air in a duct system
C) a and b
D) neither a nor b

Question 5

It is illegal to intentionally release refrigerant from air conditioning or refrigeration systems to the atmosphere.

Question 6

POE lubricants are compatible with AB or mineral oils.

Question 7

__________ is the term used to describe a complete path between two points in an electric circuit.

A) Conduction
B) Connection
C) Continuity
D) Consumption

Question 8

Two common configurations of gauge manifolds are the two-valve manifold and the four-valve manifold. The valves are __________ when turned counter-clockwise and __________ when turned clockwise.

A) closed, open
B) open, closed

Question 9

The center port on a four-valve manifold is marked VAC and is used for __________.

A) evacuation purposes
B) refrigerant recovery
C) system charging
D) system leak testing

Question 10

The ultrasonic leak detector uses a __________ to locate escaping refrigerant or nitrogen.

A) flame
B) light
C) microphone
D) pump

Question 11

Thermistor thermometers often have multiple __________.

A) function settings
B) infrared sensors
C) probes
D) resistors

Question 12

In order to ensure that the air conditioning system is properly charged, accurate pressure and temperature readings must be obtained, not only from the system itself, but also from __________.

Question 13

When the air conditioning and refrigeration technician uses the gauge manifold, he or she uses the saturation temperature on the high side of the system to help calculate __________ and the saturation temperature on the low side of the system to help calculate __________.

A) condenser subcooling, evaporator superheat
B) condenser superheat, evaporator subcooling
C) condenser supercooling, evaporator subheat
D) condenser cooling, evaporator heat

Question 14

A __________ is used to determine the presence of unburned fuel in a sample of flue gases taken from an oil burner.

A) draft gauge
B) pressure gauge
C) smoke tester
D) vacuum gauge

Question 15

__________ are used to measure very low pressures and sometimes vacuums on air conditioning, heating and refrigeration systems.

A) Anometers
B) Manometers
C) Thermometers
D) Volt-ohm milliammeters

Question 16

Fossil fuel heating systems must be set up properly to ensure that they operate as intended. Improper fuel-air mixtures on a fossil fuel appliance can lead to what four problems?

Question 17

The micron gauge is used to measure the level of vacuum reached during the evacuation process.

Question 20

Explain why it is important to investigate the uses and limitations of each type of thermometer before selecting the instrument to be used.

Question 21

The two-valve manifold has three hoses and two valves. The gauge is divided into two sides, the low side and the high side. The low side is comprised of the low side valve, the low side gauge and the low side hose, all of which are color-coded __________. The high side is comprised of the high side valve, the high side gauge and the high side hose, all of which are color-coded __________.

Question 22

__________ is the relationship that compares the amount of moisture contained in an air sample to the maximum amount of moisture that the sample can hold. __________ is simply the speed of the air, measured in feet per minute.

Question 23

The electronic leak detector uses a pump to pull air samples into the unit and test them for traces of __________.

Question 24

Taking temperature readings ranks among the most commonly performed tasks in our industry. A number of different types of thermometers are available. List three common thermometer types.

Question 25

Systems that operate with HCFC refrigerants, such as R-22, use __________ oil or __________ oil. Systems that operate with HFC refrigerants and HFC blends, such as R-410A, use __________ oil.

Question 26

The __________ leak detector operates with an open flame and indicates a refrigerant leak when the flame color changes from __________ to __________,

Question 27

The __________ leak detector utilizes a fluorescent refrigerant dye that is added to, and circulated through, the system. The point of the leak is located as it glows when observed.

Question 28

The center hose on a two-valve manifold is color-coded __________. List the four pieces of equipment to which this hose can be connected.

Question 29

The vacuum pump is used to evacuate air conditioning and refrigeration systems. The process of evacuation involves the __________ and __________ of the system. Degassing involves the removal of air, nitrogen and other __________ from the system, while dehydration involves the removal of __________ from the system.

Question 30

Probably one of the most important tools the air conditioning and refrigeration technician uses is the gauge manifold. The manifold is made up of two gauges. One gauge, used to measure __________ and __________, is color-coded blue. The other gauge, used to measure __________, is color-coded red.

Question 31

A fin straightener, also commonly known as a __________, is used to straighten the aluminum fins on condenser or evaporator coils that have become bent or slightly damaged.

Question 32

The four-valve manifold has two center ports. The two center ports are labeled __________ and __________.

Question 33

The one main difference between the clamp-on meter and the VOM is that the clamp-on meter __________.

Question 34

Pressures measured by the manometer are measured in __________, where __________ = 1 psig.

Question 35

List five elements that can be measured by a combustion analyzer.

Question 36

The technician should always use a __________ when adding refrigerant to, or removing refrigerant from a system, as proper record keeping regarding refrigerant quantities added to, removed from, or leaking from systems is vital.

Question 37

The VOM is used to measure what four aspects of the electrics circuits in the air conditioning, heating or refrigeration system?

Question 38

The refrigeration service wrench is used to turn __________ stems on system valves and tanks. Using this tool on such stems helps ensure that the stems do not get __________.

Question 39

The amperage mode on the VOM is not often used by the service technician because __________.

Question 40

A __________ snip can cut through multiple layers of metal. A __________ is used to remove V-shaped sections from a sheet of metal. A __________ is used to make sharp bends in pieces of sheet metal. __________ are used to create flanges on the end of a sheet metal section.

Question 41

Sheet metal hammers are easily identified as they have __________ heads and __________ edges.

Question 42

When laying out a sheet metal duct section, various tools are used to mark the metal prior to cutting. __________ are used to scratch straight lines on the metal. __________ are used to scratch arced lines and circles on the metal. __________ can be used to scratch freeform and straight lines on the metal surface.