Test Review

Question 1

What are the units used to measure heat?

Answer 1

BTUs

Question 2

When matter is in a gaseous state, it has…

Answer 2

No size or definite shape

Question 3

What best defined heat?

Answer 3

Molecular motion

Question 4

What are three forms of heat transfer?

Answer 4

Conduction
Convection
Radiation

Question 5

The state of matter is determined by what two things?

Answer 5

Temperature and pressure

Question 6

What is the process called when a substance goes from a solid to a gas?

Answer 6

Sublimation

Question 7

What are the stages of refrigeration?

Answer 7

Compression
Condensation
Expansion
Evaporation

Question 8

What are the three physical states of matter?

Answer 8

Solid, liquid, gas

Question 9

What is the zero point of the enthalpy of water?

Answer 9

32*F

Question 10

Name four common heat transfer components in the plant.

Answer 10

Transformer cooling radiator
Surface air coolers
Oil tub cooling coil
Compressor after/intercooler

Question 11

What can we use to cool the condenser?

Answer 11

Liquid and air

Question 12

When heat is applied to a substance, the density will…

Answer 12

Decrease

Question 13

At what temperature is water the most dense?

Answer 13

39*F

Question 14

The heat that causes a change of state without temperature change is…

Answer 14

Latent heat

Question 15

True or False:

A fluid that picks up heat by evaporating at low temperature and pressure, and gives up heat by condensing at a high temperature and pressure is called a refrigerant compound.

Answer 15

True

Question 16

The amount of BTUs required to change the temperature of a substance of 1lb by 1 degree is called its…

Answer 16

Specific heat

Question 17

Does a refrigerant give up heat when it evaporates?

Answer 17

No. It absorbs heat.

Question 18

The theoretical temperature at which molecules have no movement is…

Answer 18

Absolute zero

Question 19

Temperature is the measure of the ______ of heat.

Answer 19

intensity

Question 20

The heat required to change the state of water to vapor is called…

Answer 20

Latent heat of vaporization

Question 21

What are the two kinds of dry steam?

Answer 21

Saturated and superheated

Question 22

Steam in its purest form is…

Answer 22

invisible, odorless, nonpoisonous, and relatively noncorrosive

Question 23

The temperature at which a refrigerant changes from liquid to vapor, or a vapor to liquid is called…?

Answer 23

Saturation temperature

Question 24

Water vapor that is heated above its saturation point and no longer in the presence of water is…

Answer 24

Superheated steam

Question 25

The ability of a substance to conduct heat or the rate of conduction is called…

Answer 25

Thermal conductivity

Question 26

The transfer of heat from a place where it is unwanted to a place where it is unobjectionable is called…

Answer 26

Refrigeration

Question 27

Where does the temperature of air that blows through a heat exchanger decrease from a high temperature to a low temperature?

Answer 27

At the evaporator

Question 28

What component is on the low side of the refrigeration system?

Answer 28

Evaporator

Question 29

When adding or removing heat causes a change in the temperature of a material, the heat is called ______.

Answer 29

sensible heat