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Flashcards in Basic Air Conditioning and Installtion Deck (30)
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1

Refrigeration can be described as _______.

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

2

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

compression and expansion device

3

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

Condenser and evaporator

4

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

Evaporator and condenser

5

High temperature refrigeration is that produced by _________.

An air-conditioning system

6

A ton of refrigeration is equal to _______.

288000 Btu/24-hours

7

The compressor in a refrigeration system ________.

Pumps the the refrigerant throughout the system

8

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

Controls the refrigerant flow throughout the system

9

Reciprocating compressors have ____________.

A piston and cylinder

10

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

Are heavier than air and may displace the oxygen around you

11

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

low pressure low temperature super heated vapor
high pressure high temperature superheated vapor

12

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

(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

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..

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

14

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

Goggles with side shields and gloves

15

In electrical circuits, the grounding wire is typically __________.

Green or bare

16

Tube cutters are used to __________.

Cut copper tubing

17

The pressure in a duct system is measured in _______.

WC- Water column

18

Measuring velocity pressure in a duct system indicates the __________.

Volume of air through the duct

19

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

"S" fasteners (clips) and drive clips (cleats)

20

What fastener is commonly used with round flexible duct?

Self-tapping screws and draw bands

21

What two fasteners are used fiberglass duct?

Staples and tape

22

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

tabs and adhesives

23

A trap in the condensate line prevents _______.

(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

24

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

25 feet

25

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

Space served

26

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

(1) A sutible guard
(2) A substantial gurd

27

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

1 inch

28

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

(1) Name or trademark of the manufacturer
(2) Amount and type of refrigerant

29

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

Low side

30

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

forced-air-type central furnace