Deck 2: Temperature and Pressure Fundamentals

Question 1

Gravity causes warm air to sink.

Answer 1

False

Question 2

The word latent means

A) hot.
B) cold.
C) transfer.
D) hidden.

Answer 2

D

Question 3

How is heat transfer by convection accomplished?

A) Heat travels by infrared rays.
B) Heat travels by radio waves.
C) Heat travels through the surroundind air.
D) The coller and warmer objects are touching.

Answer 3

C

Question 4

Heat flows from a hot object to an object containing less heat.

Question 5

Air movement increases the body's rate of cooling.

Question 6

Sensible heat can be measured with

A) a pressure gauge.
B) a thermometer.
C) a scale.
D) all of the above.

Question 7

All of the following are true of voltage drops EXCEPT:

A) Voltage drop is the conversion of electrical energy into another form of energy.
B) Corrosion in a circuit does not cause a voltage drop.
C) All of the source voltage in a circuit must be dropped.
D) Voltage drop can be measured with a voltmeter.

Question 8

Specific heat is the same as sensible heat.

Question 9

The sun heats the earth through the process of

A) convection.
B) conduction.
C) radiation.
D) all of the above.

Question 10

Heat is the absence of cold.

Question 11

Humidity refers to the amount of heat in the air.

Question 12

As heat energy is added to a liquid,the speed of its molecules increases.

Question 13

The acceptable comfort range for the human body is:

A) 45-50 percent relative humidity
B) 72°F-80°F
C) Both A and B
D) Neither A nor B

Question 14

Heat required to turn water into steam is latent heat.

Question 15

Technician A says sensible heat can be measured.Technician B says specific heat is the amount of heat required to change one pound of a substance by 1°F.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 16

Technician A says latent heat is hidden heat.Technician B says latent heat is required for a change of state.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 17

All of the following statements about oxygen are true,EXCEPT:

A) Oxygen makes up 78 percent of the air we breathe.
B) Oxygen is essential to all animal life.
C) Oxygen combines readily with other elements to form complex chemicals.
D) Oxygen is normally a gas.

Question 18

The radiation process is not affected by the surrounding air temperature.

Question 19

All of the following statements about heat transfer are true,EXCEPT:

A) Molecular motion is transmitted to molecules that have less motion.
B) Some of the molecules give up their energy to other molecules that have more energy.
C) Heat flows from matter at a higher temperature to matter at a lower temperature.
D) Heat never flows from low-temperature matter to high-temperature matter.

Question 20

Heat is removed from the body by the process of evaporation.

Question 21

Constant removal of body heat takes place by three processes.Name them.

Question 22

Technician A says latent heat cannot be felt.Technician B says latent heat cannot be measured with a thermometer.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 23

Evaporation is being discussed.Technician A says heat is lost when evaporation occurs.Technician B says the rate of evaporation is not affected by air movement.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 24

What are the three states of matter?

Question 25

A change in pressure can affect the ________ of a substance.

A) vaporization
B) toxicity
C) condensation
D) Both A & C

Question 26

Explain what happens to molecules at absolute zero (-459.67°F).

Question 27

What is the unit of measurement used to measure latent heat?

Question 28

Define specific heat.

Question 29

What are the three basic terms used to describe the three types of heat?

Question 30

All of the following are gas laws,except:

A) Charles' Law
B) Darwin's Law
C) Dalton's Law
D) Boyle's Law

Question 31

The ideal relative humidity is between ____ and ____ percent.

A) 10, 100
B) 20, 80
C) 30, 70
D) 40, 60

Question 32

Technician A says convection may occur in liquids and gases.Technician B says conduction can occur between two substances that are at different temperatures.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 33

What is the major difference between evaporation and boiling?

Question 34

Identify the components of a molecule of water.Explain why the water molecule differs from its component elements.

Question 35

The heat added to a vapor causing it to become warmer is called:

A) Latent heat
B) Sensible heat
C) Superheat
D) Specific heat

Question 36

The metric term for pressure (psi)is

A) Kilogram (kg).
B) KiloPascal (kPa).
C) Liter per millimeter (Lm).
D) Liter per centimeter (Lc).

Question 37

What unit of measurement is resistance in an electrical circuit meased in?

Question 38

One British thermal unit (Btu)contains ____ calories.

A) 144
B) 212
C) 252
D) 970

Question 39

What is the heat that causes a change of state but cannot be measured on a thermometer called?

Question 40

Technician A says convection is the process of heat moving to cold.Technician B says convection also involves the movement of heat upwards.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 41

Briefly define the term voltage.

Question 42

Briefly define the term current.

Question 43

List some air conditioning service equipment that is usually supplied by the shop.