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WorksheetsACR 101 Midterm
Total questions: 45
Worksheet time: 8hrs 30mins
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 ___.
501 R
20 C
303 K
77 F
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
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?
a. 1,304 Btu
b. 3,912 Btu
c. 2,608 Btu
d. 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?
a. 144 Btu
b. 313 Btu
c. 526 Btu
d. 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 at 0°F has no heat energy or molecular activity.
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
In order for water at 60°F to boil, it must absorb both sensible and latent heat.
True
False
Match the temperature in degrees Celsius with the correct equivalent Fahrenheit temperature.
10 C
50 F
100 C
212 F
-45 C
-49 F
25 C
77 F
0 C
32 F
A solid material exerts a pressure or force ____.
downward only
outward and downward
in all directions
outward only
A liquid material exerts a pressure or force ____.
outward and downward
outward only
in all directions
downward only
A vapor material exerts a pressure or force ____.
outward only
in all directions
downward only
outward and downward
If the temperature remains constant and the volume that a gas occupies increases, the pressure will ____.
increase
remain the same
cannot be determined from the information given
decrease
The volume of gas varies inversely with the absolute pressure, provided the temperature remains constant. This is called ____.
Boyle's Law
Tom's Law
Charles' Law
Dalton's Law
At a constant pressure, the volume of a gas varies as to the absolute temperature and at a constant volume the pressure of the gas varies directly with the absolute temperature. This is known as ____.
Charles' Law
Boyle's Law
Tom's Law
Dalton's Law
The total pressure of a confined mixture of gases is the sum of the pressures of each of the gases in the mixture. This is known as ____.
Boyle's Law
Dalton's Law
Tom's Law
Charles' Law
The unit used to measure electrical power is the ____.
ohm
ampere
volt
watt
One watt of electrical energy is equal to ____.
3.413 Btu/h
3.416 Btu/h
3.1416 Btu/h
3.3416 Btu/h
How many watts of electrical power are equal to 1 horsepower?
746
33000
15000
660
Match the gas law with its properties.
Dalton's law
PTOTAL = PSUBSTANCE 1 + PSUBSTANCE 2
Boyle's law
P1 X V1 = P2 X V2
Charles' law
V1 / T1 = V2 / T2
Match the following terms with their proper units and/or formulas.
LB/FT3
DENSITY
33,000 FT-LB/MIN
HP
NO UNITS
SPECIFIC GRAVITY
FT3/LB
SPECIFIC VOLUME
FORCE X DISTANCE
WORK
What happens when room temperature soda is poured into a glass of ice?
The ice melts because the soda is colder than the ice.
The ice gets colder.
The ice melts because it is absorbing heat from the soda.
The ice melts because it is giving up the "cold" to the soda.
Ice melts in iceboxes because _____.
heat enters when the door is opened
heat flows through the insulated walls
ALL ANSWERS
heat enters when warm food is placed in the icebox
Refrigeration can be described as _____.
the process of introducing heat to a location where it is not wanted
the process of removing heat from a place where it is not wanted to a place where it makes little or no difference
the process of making products cold
None of the above.
The temperature inside the refrigerator fresh food section should be about _____.
25°F
30°F
35°F
40°F
A ton of refrigeration is equal to ____.
288,000 Btu/24 h
144 Btu/h
12,000 Btu/min
1 ton of ice
The ____ relationship correlates the vapor pressure and the boiling point of water and is the basis for controlling the cooling system's temperatures.
temperature/pressure
boiling/pressure
boiling/vapor
temperature/vapor
The ____ are used to change the vapor to a liquid and the liquid form back into a vapor, the refrigeration cycle.
condenser and evaporator
condenser and compressor
expansion device and evaporator
compressor and expansion device
The evaporator in a refrigeration system ____.
reduces the boiling point of the refrigerant
absorbs heat from the product to be cooled
condenses the refrigerant
compresses the refrigerant vapor
The condenser ____.
All of the above.
controls the refrigerant flow throughout the system
rejects the heat from the refrigerant
adds superheat to the refrigerant
When a refrigerant enters the compressor, it is a ____ and when it leaves the compressor, it is a ____.
low pressure low temperature superheated vapor, low pressure low temperature subcooled vapor
low pressure low temperature subcooled liquid, high pressure high temperature superheated vapor
high pressure superheated vapor, low pressure superheated vapor
low pressure low temperature superheated vapor, high pressure high temperature superheated vapor
The compressor in a refrigeration system ____.
a. Both a and b.
b. None of the above.
c. raises the boiling point of the refrigerant
d. pumps the refrigerant throughout the system
Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure?
R-134A
R-22
R-502
R-12
The law requires technicians to recover refrigerant from all refrigeration systems so that they ____.
a. will not be released into the atmosphere
b. may be used again
c. ALL ANSWERS
d. may be reclaimed for future use
The halide leak detector should be used in well ventilated areas as the resulting blue or green flame indicates that phosgene gas is being produced.
True
False
