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WorksheetsACR-101 End of Unit 1 Test (QWK3)
Total questions: 59
Worksheet time: 38mins
Under standard conditions, water freezes a (a) °C.
Temperature is defined as...
how hot it is
the level of heat
how cold it is
why it is hot
Molecular motion stops at (a) °F.
In which direction does heat flow?
from a cold substance to a cold substance
down
from a warm substance to a cold substance
up
One British thermal unit will raise the temperature of ________°F.
1 lb of water 5
5 lbs of water 1
1 lb of water 10
1 lb of water 1
An increase in sensible heat causes
no change of the thermometer reading.
a higher thermometer reading.
ice to melt.
a lower thermometer reading.
Specific heat is the amount of heat necessary to raise the temperature of 1 lb of a _______1°F.
atmosphere
liquid
substance
gas
Latent heat causes
temperature to fall.
a higher thermometer reading.
termperature to rise.
a change of state.
Atmospheric pressure at sea level under standard conditions is (a) inches of mercury (Hg) or (b) pounds per square inch absolute (psia).
To change from psig to psia, you must add _______ to psig.
32
14.696
29.92
-460
Which of the following represents a different temperature than the other three?
15°C
475°K
59°F
519°R
Of the following choices, the warmest temperature is
20°C
303°K
501°R
77°F
Temperature can be thought of as
the amount of heat in a material
the weight of the total mass of the material
a description of the level of heat
the density of the material
At standard conditions on the Celsius scale, water will boil at
32°C
100°C
0°C
212°C
Pure water boils at a temperature of 212°F at which of the following standard conditions?
12.696 psia
13.696 psia
14.696 psia
15.696 psia
The temperature on the Fahrenheit scale where all molecular biology activity stops is
-460°F
-462.95°F
-0°F
-450°F
The temperature on the Celsius scale where all molecular activity stops is
-273°C
-460°C
-459.6°C
-293°C
As the temperature of a material increases, the molecules in the material
travel in more of a parallel direction
travel faster
slow down
stop moving
The Celsius equivalent of 80°F is
26.7°C
27.5°C
25.5°C
26.3°C
How many Btus are required to change one pound of ice at 20°F to steam at 220°F
6,520 Btu
3,912 Btu
1,304 Btu
2,608 Btu
How many Btus are required to change five pounds of ice at 20°F to steam at 220°F?
1,304 Btu
3,912 Btu
2,608 Btu
6,520 Btu
How many Btus must be removed from one pound of water at 200°F for it to end up as ice at 30°F
144 Btu
313 Btu
526 Btu
828 Btu
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.
specific heat
relative heat
sensible heat
latent heat
The standard atmospheric pressure at sea level is
29.71 in. Hg
29.83 in. Hg
29.92 in. Hg
29.60 in. Hg
PSIG indicates...
pounds per square inch of pressure absolute
pounds per square inch gauge pressure
pounds per square inch gravity pressure
pounds per square inch of gravity
A Bourdon tube is often found in a(n).....
mercury thermometer
aneroid barometer
pressure gauge
mercury barometer
Water boils at 212°C.
True
False
Water at 0°F has no heat energy or molecular activity.
True
False
The Fahrenheit scale is used in the English measurement system by the United States.
True
False
Temperature difference does not affect heat transfer rate.
True
False
The difference in the volume of two substances will determine the heat transfer rate between the substances.
True
False
The difference in the level of heat between two substances will determine the heat transfer rate between the substances.
True
False
The laws of thermodynamics can help us to understand what heat is all about.
True
False
Both sensible heat and latent heat transfers can be read with a thermometer.
True
False
In order for water at 60°F to boil, it must absorb both sensible and latent heat.
True
False
When water at 212°F boils, it is only absorbing latent heat.
True
False
The two common temperature scales used by air conditioning and refrigeration technicians are called __________ and__________.
Fahrenheit, Celsius
Celsius, Kelvin
Rankine, Fahrenhiet
Kelvin, Fahrenheit
The Fahrenheit absolute scale is called the (a) scale.
The Celsius absolute scale is called the (a) scale.
PSIA at sea level under standard conditions is
29.98 psi
22.21 psi
14.696 psi
16.496
Heat that changes the temperature of a substance is called
base heat
sensible heat
laten heat
transformative heat
In ________heat or hidden heat, heat is known to be added, but no temperature rise is noticed.
base heat
sensible heat
laten heat
transformative heat
Raising the vapor temperature above the boiling point is called
superheating
subliquid
subheating
superliquid
Earth’s atmosphere exerts a weight or pressure of ________ psi at sea level.
16.496
29.28
22.21
14.696
Atmospheric pressure in inches of mercury (in. Hg) decreases __________ in. per 1000 feet increases in elevation.
1
100
50
5
A gauge that reads pressures above and below atmospheric pressure is known as __________ gauge.
preasure
digital
compound
analog
Match the temperature in degrees Celsius with the correct equivalent Fahrenheit temperature.
10 °C
50 °F
17 °C
63 °F
100 °C
212 °F
25 °C
77 °F
0 °C
32 °F
Match the temperature in degrees Fahrenheit with the correct equivalent Celsius temperature.
176 °F
80 °C
95 °F
35 °C
14 °F
-10 °C
122 °F
50 °C
59 °F
15 °C
Match the pressures in psia to the correct equivalent. (Use 15 as the conversion between psia and psig.)
0 psia
30 in. Hg vacuum
10 psia
10 in. Hg vacuum
8 psia
14 in. Hg vacuum
20 psia
5 psig
25 psia
10 psig
A British Thermal Unit is defined as the amount of heat required to raise the temperature of
1 pound of air by 1° F
1 pound of water by 1° F
1 pound of water by 10° F
1 gallon of water by 1° F
Which of the following is an example of heat transfer by conduction?
The sun's rays heating a car.
Your hand touching a heated pan.
A glowing electric heater used to heat a room.
Heated flue gases rising up a chimney.
Heat transfer by convection can be either forced or natural.
True
False
Both
Neither
Pressure is defined as force per unit of heat intensity.
True
False
Both
Neither
Atmospheric pressure is measured with an anemometer.
True
False
Both
Neither
Radiation is the only type of heat transfer that can _________.
boil water to steam
travel through a vacuum
be measured in British Thermal Units (BTUs)
transfer heat through the movement of fluid
Heat that causes and change in temperature that can be measured by a thermometer is __________.
specific heat
sensible heat
latent heat
density heat
The specific heat of water is ________ BTU/LB/°F.
0.97
1.00
0.38
0.214
A _________ is a component commonly used in an analog pressure gauge.
microprocessor
core removal tool
pressure relief valve
bourdon tube
Air at _________ conditions has a volume of 13.33 ft3/lb, an atmospheric pressure of 14.696 psia, and is 70° F at sea level.
humid
standard
saturated
arid
