Basic Air Conditioning and Installtion

Question 1

Refrigeration can be described as _______.

Answer 1

The process of removing heat from a place where it is not wanted to a place where it makes little or no difference

Question 2

The pressure in a refrigeration system in a refrigeraton system is changed in the ________.

Answer 2

compression and expansion device

Question 3

The refrigerant in a refrigeration system changes states in the __________.

Answer 3

Condenser and evaporator

Question 4

At what location or locations in a refrigeration system does the saturation pressure correspond to the saturation temperature?

Answer 4

Evaporator and condenser

Question 5

High temperature refrigeration is that produced by _________.

Answer 5

An air-conditioning system

Question 6

A ton of refrigeration is equal to _______.

Answer 6

288000 Btu/24-hours

Question 7

The compressor in a refrigeration system ________.

Answer 7

Pumps the the refrigerant throughout the system

Question 8

What is the function of the condenser in a refrigeration system?

Answer 8

Controls the refrigerant flow throughout the system

Question 9

Reciprocating compressors have ____________.

Answer 9

A piston and cylinder

Question 10

Good ventilation is important when working around refrigeration equipment because modern refrigerants ____________.

Answer 10

Are heavier than air and may displace the oxygen around you

Question 11

When a refrigerant enters the compressor, it is a ___________ and when it leaves the compressor it is a ___________.

Answer 11

low pressure low temperature super heated vapor

high pressure high temperature superheated vapor

Question 12

What precautions should be taken when working with or around large refrigerant or nitrogen tanks.

Answer 12

(1) The protective must be on when the tank is not in use
(2) Safety goggles pr glasses must be worn when when moving the tank
(3) Large tanks should not be carried, they should be secured to an approved cart

Question 13

When it is necessary to perform electrical work i an area that has a damp or wet floor, what precautions should be followed in order to ensure your safety..

Answer 13

(1) Place a rubber mat on the floor
(2) Use a wooden ladder
(3) Wear insulated boots and gloves

Question 14

When transferring refrigerants from a cylinder to a refrigeration system or any other container, you should always wear ________.

Answer 14

Goggles with side shields and gloves

Question 15

In electrical circuits, the grounding wire is typically __________.

Answer 15

Green or bare

Question 16

Tube cutters are used to __________.

Answer 16

Cut copper tubing

Question 17

The pressure in a duct system is measured in _______.

Answer 17

WC- Water column

Question 18

Measuring velocity pressure in a duct system indicates the __________.

Answer 18

Volume of air through the duct

Question 19

What two fasteners are used with sheet metal square and rectangular duct?

Answer 19

“S” fasteners (clips) and drive clips (cleats)

Question 20

What fastener is commonly used with round flexible duct?

Answer 20

Self-tapping screws and draw bands

Question 21

What two fasteners are used fiberglass duct?

Answer 21

Staples and tape

Question 22

A good way to fasten insulation to the inside of sheet metal duct is to use _______.

Answer 22

tabs and adhesives

Question 23

A trap in the condensate line prevents _______.

Answer 23

(1) Air and foreign material from being drawn into the drain line
(2) Additional cooling load from warm air drawn up into the air handler
(3) Insect invasion of the system

Question 24

The distance between the 120-volt receptacle for service and maintenance purposed and any equipment shall be within what distance?

Answer 24

25 feet

Question 25

When more than one heating or cooling appliance is installed on a roof, they shall be permanently identified as to the _________.

Answer 25

Space served

Question 26

Exposed flywheels, fans, pulleys, belts, and moving machinery, which are portions of a heating, ventilating or refrigeration system, shall have ____________.

Answer 26

(1) A sutible guard

(2) A substantial gurd

Question 27

The minimum size common condensate drain for a 20-ton and 15-ton refrigeration-rated appliance is ___________.

Answer 27

1 inch

Question 28

Heat pumps shall bear a permanent and legible factory-applied nameplate which shall appear the _________.

Answer 28

(1) Name or trademark of the manufacturer

(2) Amount and type of refrigerant

Question 29

Any portion of a refrigerating system under condenser pressure is the definition for__________.

Answer 29

Low side

Question 30

A central furnace equipped with a fan or blower that provides the primary means for circulation of air is a ________.

Answer 30

forced-air-type central furnace