Multiple Choice
Identify the
choice that best completes the statement or answers the question.
|
|
|
1.
|
All of the following are differences between hydraulics and pneumatics
EXCEPT:
a. | Hydraulics use liquid, while pneumatics use gas | c. | Pneumatics operate at higher
pressures than hydraulics | b. | Pneumatics are quicker acting and
jumpy | d. | Hydraulics are self
lubricating, while pneumatics are not |
|
|
|
2.
|
Convert 90 psig to absolute pressure
|
|
|
3.
|
Convert 800 kPa guage to absolute pressure
|
|
|
4.
|
Convert 70° to absolute temperature (°R)
|
|
|
5.
|
Convert 19° C to absolute temperature (K)
|
Matching
|
|
|
a. | adiabatic process | f. | guage pressure | b. | absolute pressure | g. | Charles’ Law | c. | Boyle’s
Law | h. | isothermal
process | d. | vacuum system | i. | mercury barometer | e. | Gay-Lussac’s
Law |
|
|
|
6.
|
Changing the volume of gas by a factor casues its pressure to change by the
inverse of that factor.
|
|
|
7.
|
Device used to measure atmospheric pressure (units of inches of Hg)
|
|
|
8.
|
Pressure read by a guage because atmospheric pressure cancels out.
|
|
|
9.
|
Absolute pressure of a confined gas is proportional to its temperature,
provided its volume remains constant.
|
|
|
10.
|
No heat is transferred to the atmosphere, so temperature of gas will increase
to a max when it is compressed.
|
|
|
11.
|
Total pressure exerted on the system, including atmospheric pressure.
|
|
|
12.
|
Uses pressure below atmospheric pressure to create suction.
|
|
|
13.
|
Under compression, the temperature of the gas remains constant.
|
|
|
14.
|
The volume of a confined gas is proportional to its temperature, provided its
pressure remains constant.
|
|
|
a. | 102.9 psig | e. | 1152 kPa guage | b. | 99.3 kPa guage | f. | 4.99 psig | c. | 34
kPa | g. | 27.2
psig | d. | 114.7 psig |
|
|
|
15.
|
10 ft3 of air taht is initially at 50 psig is compressed to a volume
of 5 ft3 . Assuming the temperature remains constant, what is the final pressure in
psig?
|
|
|
16.
|
2.5 m3 of air taht is initially at 400 kPa is compressed to a volume
of 1 m3 . Assuming the temperature remains constant, what is the final pressure in kPa
guage?
|
|
|
17.
|
8 ft3 of air that is initially at 0 psig is compressed to a volume
of 1 ft3 . Assuming temperature remains constant, what is the final pressure in
psig?
|
|
|
18.
|
Air initially at a volume of 2 ft3 and a pressure of 90 psig is
allowed to expand to 5 ft3 at constant temperature. What is the guage pressure after
expansion?
|
|
|
19.
|
Air initially at a volume of 0.5 m3 and a pressure of 700 kPa is
allowed to expand to 2 m3 at constant temperature. What is the guage pressure after
expansion?
|
|
|
20.
|
Air in a fixed volume container is initially at atmospheric pressure (0 psig)
and 70°F. Its temperature is then raised to 250°F. What is the guage pressure at final
temperature?
|
|
|
21.
|
Air in a fixed volume container is initially at atmospheric pressure (0 kPa
guage) and 21°C. Its temperature is then raised to 120°C. What is the guage pressure at
final temperature?
|
|
|
a. | 166 psig, 621°F | f. | 1140 kPa, 331°C | b. | 25.1
N | g. | 1.41
ft3 | c. | 563 kPa | h. | 132.3 psig | d. | 138 psig | i. | 0.939 m3 | e. | 7.71
lb |
|
|
|
22.
|
Air is held in a container wiath a free sliding poisition, such as the one
shown in figure 10-3 in the book. It is initially at a temperature of 80°F and a volume of 1
ft3. Its temperature is then raised to 300°F. What is the volume of air after being
heated?
|
|
|
23.
|
Air is held in a container with a free sliding poisition, such as the one shown
in figure 10-3 in the book. It is initially at a temperature of 25°C and a volume of 0.75
m3. Its temperature is then raised to 100°C. What is the volume of air after being
heated?
|
|
|
24.
|
Air initially at 70°F and 0 psig inititally occupies a volume of 10
ft3 . If its volume is reduced to 1 ft3 while its temperature increases to
90°F, what is the resulting final pressure?
|
|
|
25.
|
Air initially at 22°C and 0 kPa abs inititally occupies a volume of 3
m3 . If its volume is reduced to 0.5 m3 while its temperature increases to
50°C, what is the resulting final pressure?
|
|
|
26.
|
Air initially at 75°F and atmospheric pressure is compressed from 100
ft3 to 10 ft3. The temperature of the air is measured at 95°F after
compression. Determine the final pressure using Boyle’s Law and assuming the temperature
remained at 75°F after compression.
|
|
|
27.
|
Air initially at 68°F and atmospheric pressure is compressed from 60
ft3 to 10 ft3. Assuming the process is adiabatic, what is the final pressure
and temperature of the gas?
|
|
|
28.
|
Air initially at 22°C and atmospheric pressures is compressed from 30
m3 to 5 m3 . Assuming the process is adiabatic, what is the final pressure and
temperature of the gas?
|
|
|
29.
|
A suction cup with an inside diameter of 1 in is used in a vacuum system that
pulls 20 in Hg. What is the max lifting force?
|
|
|
30.
|
A suction cup with an inside diameter of 20 mm is used in a vacuum system that
pulls 600 mm Hg. What is the max lifting force?
|