Deck 1: Heat and Pressure

Question 1

The Celsius equivalent of 80°F is ____.

A) 25.5°C
B) 26.7°C
C) 26.3°C
D) 27.5°C

Answer 1

B

Question 2

The Fahrenheit scale is used in the English measurement system by the United States.

Answer 2

True

Question 3

The standard atmospheric pressure at sea level is ____.

A) 29.60 in. Hg
B) 29.71 in. Hg
C) 29.83 in. Hg
D) 29.92 in. Hg

Answer 3

D

Question 4

Water at 0°F has no heat energy or molecular activity.

Question 5

The temperature on the Fahrenheit scale where all molecular biology activity stops is ____.

A) -450°F
B) -460°F
C) -0°F
D) -462.95°F

Question 6

PSIG indicates ____.

A) pounds per square inch gravity pressure
B) pounds per square inch gauge pressure
C) pounds per square inch of pressure absolute
D) pounds per square inch of gravity

Question 7

The amount of heat needed to change the temperature of a substance will vary with the type of substance. This heat quality is called the ____ of the substance.

A) sensible heat
B) specific heat
C) latent heat
D) relative heat

Question 8

Of the following choices, the warmest temperature is ____.

A) 20°C
B) 303°K
C) 501°R
D) 77°F

Question 9

How many Btus are required to change one pound of ice at 20°F to steam at 220°F?

A) 1,304 Btu
B) 2,608 Btu
C) 6,520 Btu
D) 3,912 Btu

Question 10

Pure water boils at a temperature of 212°F at which of the following standard conditions?

A) 12.696 psia
B) 13.696 psia
C) 14.696 psia
D) 15.696 psia

Question 11

How many Btus are required to change five pounds of ice at 20°F to steam at 220°F?

A) 1,304 Btu
B) 2,608 Btu
C) 6,520 Btu
D) 3,912 Btu

Question 12

How many Btus must be removed from one pound of water at 200°F for it to end up as ice at 30°F?

A) 144 Btu
B) 828 Btu
C) 313 Btu
D) 526 Btu

Question 13

Temperature can be thought of as ____.

A) the amount of heat in a material
B) the density of the material
C) a description of the level of heat
D) the weight of the total mass of the material

Question 14

A Bourdon tube is often found in a(n) ____.

A) mercury barometer
B) aneroid barometer
C) pressure gauge
D) mercury thermometer

Question 15

The temperature on the Celsius scale where all molecular activity stops is ____.

A) -273°C
B) -293°C
C) -460°C
D) -459.6°C

Question 16

Water boils at 212°C.

Question 17

At standard conditions on the Celsius scale, water will boil at ____.

A) 100°C
B) 212°C
C) 32°C
D) 0°C

Question 18

As the temperature of a material increases, the molecules in the material ____.

A) stop moving
B) travel faster
C) slow down
D) travel in more of a parallel direction

Question 19

Which of the following represents a different temperature than the other three?

A) 15°C
B) 59°F
C) 475°K
D) 519°R

Question 20

Temperature difference does not affect heat transfer rate.

Question 21

The two common temperature scales used by air conditioning and refrigeration technicians are called ____________________ and ____________________.

Question 22

A gauge that reads pressures above and below atmospheric pressure is known as ____________________ gauge.

Question 23

The difference in the volume of two substances will determine the heat transfer rate between the substances.

Question 24

Explain heat transfer by conduction .

Question 25

What does the first law of thermodynamics state?

Question 26

Define a Btu.

Question 27

What are the most common fluid mediums in the heating and air-conditioning trades?

Question 28

Heat that changes the temperature of a substance is called ____________________ heat.

Question 29

Both sensible heat and latent heat transfers can be read with a thermometer.

Question 30

Raising the vapor temperature above the boiling point is called ____________________.

Question 31

Earth's atmosphere exerts a weight or pressure of ____________________ psi at sea level .

Question 32

The difference in the level of heat between two substances will determine the heat transfer rate between the substances.

Question 33

In order for water at 60°F to boil, it must absorb both sensible and latent heat.

Question 34

In ____________________ heat or hidden heat, heat is known to be added, but no temperature rise is noticed.

Question 35

The Fahrenheit absolute scale is called the ____________________ scale.

Question 36

The Celsius absolute scale is called the ____________________ scale.

Question 37

PSIA at sea level under standard conditions is ____________________.

Question 38

Atmospheric pressure in inches of mercury ( in. Hg ) decreases ____________________ in. per 1000 feet increase in elevation.

Question 39

When water at 212°F boils, it is only absorbing latent heat.

Question 40

The laws of thermodynamics can help us to understand what heat is all about.

Question 44

Why is radiation the only type of heat transfer that can travel through a vacuum, such as space?

Question 45

What is the difference between a mercury barometer and an aneroid barometer?