Low Pressure Boilers Chapter 10

Front 1

Water is the most common medium used to transport heat from the area to be cooled.

Back 1

True

Front 2

Some cooling systems can be designed to share components with a hot water heating system.

Back 2

True

Front 3

Chiller systems are commonly used in refinery, brewery, and dairy applications.

Back 3

True

Front 4

Heat flows from a cold material to a hot material.

Back 4

False

Front 5

Heat energy can be changed to mechanical energy.

Back 5

True

Front 6

Latent heat is the amount of heat that changes the temperature of a substance but not the state of a substance.

Back 6

False

Front 7

When refrigerant gas is compressed, the temperature and pressure are lowered.

Back 7

False

Front 8

Refrigerant is converted from a gas to a liquid in the condenser.

Back 8

True

Front 9

An absorption refrigeration system uses a compressor to provide pressurized ammonia to the system.

Back 9

False

Front 10

Refrigerant is changed from a liquid to a gas in the low pressure side of a compression system.

Back 10

True

Front 11

Latent heat is heat added to a substance that changes its state without a change in temperature.

Back 11

True

Front 12

In a compression refrigeration system, heat transfer occurs at the expansion valve and the compressor.

Back 12

False

Front 13

When ice changes into water, there is a change in state.

Back 13

True

Front 14

In a refrigeration system, heat is absorbed when a fluid changes from a liquid to a gas.

Back 14

True

Front 15

A scroll compressor has reciprocating cylinders to compress the refrigerant.

Back 15

False

Front 16

The evaporator is located on the high pressure side of a cooling system.

Back 16

False

Front 17

A refrigerant absorbs heat when changing from a liquid to a gaseous state.

Back 17

True

Front 18

Direct cooling systems are used where the space or product to be cooled is located a considerable distance from the condensing equipment.

Back 18

False

Front 19

Refrigerants used in a compression refrigeration system must have a boiling point below the temperature of the air leaving the evaporator.

Back 19

True

Front 20

If the pressure on a refrigerant increases, the boiling point decreases.

Back 20

False

Front 21

In a direct cooling system, the evaporator is in direct contact with the space or product being cooled.

Back 21

True

Front 22

Compression refrigeration systems are commonly used for air conditioning applications.

Back 22

True

Front 23

Heat is released by the refrigerant at the evaporator.

Back 23

False

Front 24

Liquid refrigerant leaves the condenser under high pressure before reaching the expansion valve.

Back 24

True

Front 25

Refrigerant pressure is controlled by the expansion valve located between the evaporator and the compressor.

Back 25

False

Front 26

In a lithium bromide and water system, heat is applied at the generator.

Back 26

True

Front 27

Indirect cooling systems use refrigerant piped to the space or product to be cooled.

Back 27

False

Front 28

Chlorofluorocarbons (CFCs) are present in all refrigerants used in compression systems.

Back 28

False

Front 29

Cooling systems use equipment similar to hot water heating systems.

Back 29

True

Front 30

Air conditioning systems are cooling systems used to cool air for comfort in building spaces.

Back 30

True

Front 31

Water chilled in a cooling system is chilled by the ___.

Back 31

chiller

Front 32

Heat added to a substance that changes its state without a change in temperature is ___ heat.

Back 32

latent

Front 33

In a(n) ___ system, water is commonly used to absorb heat from the product or space to be cooled.

Back 33

chilled water

Front 34

In a compression refrigeration system, liquid refrigerant under high pressure is allowed to drop in pressure by the ___.

Back 34

expansion valve

Front 35

Absorption refrigeration systems may use ___ as a refrigerant.

Back 35

lithium bromide and water

Front 36

Cooling units that cool building spaces are designed to ___ heat from the air.

Back 36

absorb

Front 37

In a refrigeration system, heat is ___ when a fluid changes from a gas to a liquid.

Back 37

In a refrigeration system, heat is ___ when a fluid changes from a gas to a liquid.

Front 38

In a compression refrigeration system, high pressure vapor is converted from a gas to a liquid in the ___.

Back 38

condenser

Front 39

In a compression refrigeration system, the refrigerant absorbs heat in the ___.

Back 39

evaporator

Front 40

In a lithium bromide and water refrigeration system, heat is commonly applied with steam coil at the ___.

Back 40

generator

Front 41

In a lithium bromide system, cooling water is directed through the ___ and condenser to remove heat.

Back 41

absorber

Front 42

Indirect cooling systems commonly use ___ as a medium to cool the space or product.

Back 42

chilled water

Front 43

In a compression refrigeration system, heat is absorbed by the refrigerant in the ___.

Back 43

low pressure side

Front 44

Common condenser designs include ___ condensers.

Back 44

shell-and-coil, shell-and-tube, & tube-in-tube

Front 45

In a compression refrigeration system, the ___ is used to change the pressure of a refrigerant gas.

Back 45

compressor

Front 46

The compressor will be damaged if ___ refrigerant is allowed to enter.

Back 46

liquid

Front 47

Refrigerants used in a compression system must be ___.

Back 47

noncorrosive, chemically stable, nonflammable

Front 48

An absorption refrigeration system includes all of the following except the ___.

Back 48

compressor

Front 49

_____ refrigerants do not contain chlorine and are safer for the environment.

Back 49

HFC

Front 50

In indirect cooling systems, ___ used as a medium must be kept above 32°F.

Back 50

water