Multiple Choice
Identify the
choice that best completes the statement or answers the question.
|
|
|
1.
|
Which of the following represents a different temperature than the other
three?
a. | 15°C | b. | 59°F | c. | 475°K | d. | 519°R |
|
|
|
2.
|
Of the following choices, the warmest temperature is ____.
a. | 20°C | b. | 303°K | c. | 501°R | d. | 77°F |
|
|
|
3.
|
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 |
|
|
|
4.
|
At standard conditions on the Celsius scale, water will boil at ____.
a. | 100°C | b. | 212°C | c. | 32°C | d. | 0°C |
|
|
|
5.
|
Pure water boils at a temperature of 212°F at which of the following
standard conditions?
a. | 12.967 psi | b. | 13.967 psi | c. | 14.696
psi | d. | 15.967 psi |
|
|
|
6.
|
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 |
|
|
|
7.
|
The temperature on the Celsius scale where all molecular activity stops is
____.
a. | -273°C | b. | -272.6°C | c. | -277.8°F | d. | -274.1°C |
|
|
|
8.
|
As the temperature of a material increases, the molecules in the material
____.
a. | travel farther | b. | travel faster | c. | slow
down | d. | travel in more of a parallel direction |
|
|
|
9.
|
The Celsius equivalent of 80°F is ____.
a. | 25.5°C | b. | 26.7°C | c. | 26.3°C | d. | 27.5°C |
|
|
|
10.
|
How many Btus are required to change one pound of ice at 20°F to steam at
220°F?
a. | 1,304 Btu/h | b. | 2,608 Btu/h | c. | 6,520
Btu/h | d. | 3,912 Btu/h |
|
|
|
11.
|
How many Btu's are required to change five pounds of ice at 20°F to
steam at 220°F?
a. | 1,304 Btu/h | b. | 2,608 Btu/h | c. | 6,520
Btu/h | d. | 3,912 Btu/h |
|
|
|
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 |
|
|
|
13.
|
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 |
|
|
|
14.
|
The standard atmospheric pressure at sea level is ____.
a. | 29.60" Hg | b. | 29.71" Hg | c. | 29.83"
Hg | d. | 29.92" Hg |
|
|
|
15.
|
PSIG indicates ____.
a. | pounds per square inch absolute gravity | b. | pounds per square
inch absolute gauge | c. | pounds per square inch of pressure
absolute | d. | pounds per square inch of gravity |
|
|
|
16.
|
A Bourdon tube is often found in a(n) ____.
a. | mercury barometer | b. | aneroid barometer | c. | pressure
gauge | d. | mercury thermometer |
|
True/False
Indicate whether the
statement is true or false.
|
|
|
1.
|
Water boils at 212°C.
|
|
|
2.
|
Water at 0°F has no heat energy or molecular activity.
|
|
|
3.
|
The Fahrenheit scale is used in the English measurement system by the United
States.
|
|
|
4.
|
Temperature difference does not affect heat transfer rate.
|
|
|
5.
|
The difference in the volume of two substances will determine the heat transfer
rate between the substances.
|
|
|
6.
|
The difference in the level of heat between two substances will determine the
heat transfer rate between the substances.
|
|
|
7.
|
The laws of thermodynamics can help us to understand what heat is all
about.
|
|
|
8.
|
Both sensible heat and latent heat transfers can be read with a
thermometer.
|
|
|
9.
|
In order for water at 60°F to boil, it must absorb both sensible and latent
heat.
|
|
|
10.
|
When water at 212°F boils, it is only absorbing latent heat.
|
Completion
Complete each
statement.
|
|
|
1.
|
The two common temperature scales used by air conditioning and refrigeration
technicians are called ____________________ and ____________________.
|
|
|
2.
|
The Fahrenheit absolute scale is called the ____________________ scale.
|
|
|
3.
|
The Celsius absolute scale is called the ____________________ scale.
|
|
|
4.
|
PSIA at sea level under standard conditions is ____________________.
|
|
|
5.
|
Heat that changes the temperature of a substance is called ____________________
heat.
|
|
|
6.
|
In ____________________ heat or hidden heat, heat is known to be added, but no
temperature rise is noticed..
|
|
|
7.
|
Heating the vapor temperature above the boiling point is called
____________________.
|
|
|
8.
|
The weight of a column of air at sea level at standard conditions is
____________________ psig.
|
|
|
9.
|
Atmospheric pressure in inches of mercury (" Hg) decreases
____________________ per 1000 feet increase in elevation.
|
|
|
10.
|
A gauge that reads 0 psi when opened to the atmosphere are known as
____________________ gauge.
|
Short Answer
|
|
|
1.
|
Define a Btu.
|
|
|
2.
|
How many Btus of heat are removed per hour when the water at a flow rate of 10
gallons per minute is cooled 15°F? (Water weighs 8.33 lb. per gallon.)
|
|
|
3.
|
Define conduction of heat.
|
|
|
4.
|
Define convection of heat.
|
|
|
5.
|
Define radiation of heat.
|
|
|
6.
|
What is the difference between a mercury barometer and an aneroid
barometer?
|
Matching
|
|
|
Match the temperature in degrees Celsius with the correct equivalent
Fahrenheit temperature. a. | 32 °F | d. | 50 °F | b. | 1.4
°F | e. | -49
°F | c. | 212 °F | f. | 77° F |
|
|
|
1.
|
100°C
|
|
|
2.
|
0°C
|
|
|
3.
|
25°C
|
|
|
4.
|
-45°C
|
|
|
5.
|
10°C
|
|
|
6.
|
-17°C
|
|
|
Match the temperature in degrees Fahrenheit with the correct equivalent
Celsius temperature. a. | 35°C | d. | 80°C | b. | -10°C | e. | 15°C | c. | 200°C | f. | 50°C |
|
|
|
7.
|
392°F
|
|
|
8.
|
59°F
|
|
|
9.
|
122°F
|
|
|
10.
|
14°F
|
|
|
11.
|
95°F
|
|
|
12.
|
176°F
|
|
|
Match the pressures in psia to the correct equivalent. (Use 15 as the
conversion between psia and psig.) a. | 5 psig | d. | 10
psig | b. | 30" Hg Vac | e. | 10" Hg Vac | c. | 70 psig | f. | 14" Hg Vac |
|
|
|
13.
|
10 psia
|
|
|
14.
|
85 psia
|
|
|
15.
|
8 psia
|
|
|
16.
|
0 psia
|
|
|
17.
|
20 psia
|
|
|
18.
|
25 psia
|