Chapter 10

Question 1

Who sets refrigerant cylinder regulations?

Answer 1

The department of transportation also known as the DOT

Question 2

Large for refrigerant cylinders are protected against bursting buy

Answer 2

A protective cap

Question 3

What type of cylinders are often positioned upside down with the valves at the bottom

Answer 3

A storage cylinder

Question 4

The operating element used in the pressure gauges that is made of a thin walled tube of metal Bent into circular shape is called a

Answer 4

Bourbon tube

Question 5

A an extra spring in a pressure gauge used to adjust the gauges calibration is called a what?

Answer 5

Retarder

Question 6

A pressure gauge that is specifically designed to measure lower than atmospheric pressure is called a

Answer 6

Vacuum gauge

Question 7

A pressure gauge designed to measure pressure above and below atmospheric pressure is a

Answer 7

Compound gauge

Question 8

A pressure gauge that can read high pressure values on a single continuous scale from 0 to 180 psi is a

Answer 8

High pressure gauge

Question 9

A service port is closed off from the refrigeration system when the service valve is in what position?

Answer 9

Back seated

Question 10

Which of the following service valves is located on the low side of a refrigeration system

Answer 10

Suction line service valve

Question 11

During normal system operation hot high pressure refrigerant vapor flows through Which valve?

Answer 11

Discharge service valve

Question 12

This is used mostly for checking pressure and does not have a service valve to control the flow of refrigerant what is it

Answer 12

Access port

Question 13

In externally threaded valve with a spring loaded center pin is called a

Answer 13

Schrader valve

Question 14

The technician must use this to access small hermetic systems that do not have service valves or access ports

Answer 14

A piercing valve

Question 15

The process of removing unwanted air vapor dirt and moisture from gauge manifold hoses by venting them to the atmosphere is called what?

Answer 15

Purging

Question 16

Which system procedure is normally done with both hand valves opened On a gauge manifold connected to a refrigeration system

Answer 16

Evacuation

Question 17

Name the three areas where leaks are likely to occur?

Answer 17

Tubing connections
Braised joints
High vibration areas

Question 18

The leak detection method involving the application of a soap and water solution to areas will leaks are suspected is the

Answer 18

Bubble solution

Question 19

The leak detection method that uses ultraviolet light to find leaking refrigerant is the

Answer 19

Fluorescent

Question 20

The leak detection method that involves burning a fuel gas near a copper plate and using a rubber hose to siphon air from areas suspected of leaking refrigerant is

Answer 20

Halide torch leak detectors

Question 21

Which of the following is a disadvantage of using an electronic leak detector

Answer 21

It produces false alarms near urethane insulation

Question 22

The leak detection method that the text the sound of vapor escaping from a system is

Answer 22

Ultrasonic detector

Question 23

A device used for creating vacuums to dehydrate an HVAC system is

Answer 23

Vacuum pump

Question 24

Which of the following terms used to specify the speed at which gas can be pumped through a vacuum pump

Answer 24

Free air displacement

Question 25

What acts as a fluid seal between air , gases and contaminates entering a vacuum pump from the refrigeration system

Answer 25

Vacuum pump oil

Question 26

Cleaning a refrigerant for reuse by oil separation in single or multiple passes through a filter dryer defines

Answer 26

Recycling

Question 27

Removing a refrigerant from system in storing it in an external container regardless of the condition of the refrigerant is

Answer 27

Recovery

Question 28

Re-processing a refrigerant so that it is chemically pure is

Answer 28

Reclaiming

Question 29

An instrument used to monitor the weight of refrigerant cylinder as refrigerant is being charged into or recovered from the system is called

Answer 29

Solenoid valve built into a scale