Pneumatics Flashcards
(97 cards)
1
Q
What is boyles law?
A
P1 x V1 = P2 x V2
2
Q
Pressure increase will do what to velocity?
A
Decrease
3
Q
What is kelvin?
A
-273.15 Celsius
4
Q
Is kelvin used for Celsius or ferinheight
A
Celsius
5
Q
What is -273.15 kelvin equal to?
A
0 degrees Celsius
6
Q
How would 0 degrees ferinheight be expressed in rankin?
A
-459.73
7
Q
What is rankin?
A
-459.73
8
Q
How would you find temperature change?
A
Absolute +/- temperature given
9
Q
What is the formula to go from Celsius to ferinheight
A
F = [(9/5)xC]+32
= (1.8xC)+32
10
Q
What is the formula to go from ferinheight to Celsius
A
C= 5/9 x (F-32)
= 0.55555 x (F-32)
11
Q
What does 0.55555 x (F-32) find?
A
The Celsius equivalent to a ferinheight
12
Q
What is the main advantage of pneumatics?
A
Smooth operation
13
Q
What are the two types of compression?
A
Isothermal
Adiabatic
14
Q
What is isothermal compression?
A
Heat is generated and removed at a rate that temperatures remain consistant
15
Q
What is adiabatic compression?
A
Increase in temperature of the air increasing the pressure
16
Q
What are the 3 classifications of compressors?
A
Compressors
Booster fans
Vacuum pumps
17
Q
What does a compressor do?
A
Move air from atmospheric pressure to a higher pressure
18
Q
What does a booster fan do?
A
Moves air from above atmospheric pressure to a higher pressure
19
Q
What does a vaccum pump do?
A
Compressed air from atmospheric pressure to below atomspheric pressure
20
Q
What effects does moisture have on a pneumatic system (5)
A
Freezing/bursting
Remove lubrication
Hammer effect
Reduce flow
Loss of power
21
Q
What should the slope be on a pneumatic line over 10 feet?
A
1 inch
22
Q
What should compressed air system control be sized to?
A
Meet systems max demand
23
Q
What type of dryer is the most efficient?
A
Refrigerant
24
Q
Why is it important to ensure auto drains are oriented correctly?
A
So the float reads at the right times or at all
25
Describe relative humiduty
Amount of moisture in air at a given temperature
26
Can lower or higher temperatures hold more moisture?
Higher
27
In terms of realities humidity if the air is holding the same amount of moisture and the temperature goes down what will happen to the relative humidity?
It will go up
28
What is the % of realitive humidity?
The airs moisture capacity at that given temperature
29
What happens when realitive humidity hits 100%
Condensation begins
30
How do we control realitive humidity?
Dehumidifiers
31
Define dew point
When moisture drops out of suspension due to rapid temperature change
32
Define condensation
Change of physical state of matter from gas to liquid phase (reverse evaporation)
33
If the realitive humidity is lower will you have more or less evaporation?
More
34
When does condensation typically occurs in pneumatic systems?
When a vapour is cooled and/or compressed to its saturation limits
35
What is the purpose of air inlet filters?
Protects compressors from atmospheric airborne particles
36
What are the 3 ways compressors are typically cooled?
Air
Water
Lubricants
37
How are screw compressors less than 100hp typically cooled?
Air
38
What is the purpose of fins on casings and filters?
To increase surface area to aid in cooling or filtering
39
What is the common way water cooled is typically used?
Shell and tube
40
Where are after coolers placed?
After final compression stage
41
What component removes and filters contamination from the air prior to it entering the system in terms of compressors
Seperators
42
Where are seperators typically located?
After the cooling system
43
Can you find baffles inside a separator?
Yes
44
What are the 3 types of dryers?
Refrigerant
Deliquescent
Twin tower regenerative
45
What are the 3 types of regenerative twin tower dryers?
Dry purge
Heat
Combo
46
What is the purpose of hepa filters?
To remove particulates in air
47
What percentage of particulates must a filter remove from air to be considered hepa
99.7
48
What is the purpose of ultra violet filters?
To kill bacteria mold and viruses
49
What order should lubrication filters and regulators be in?
FRL
FILTER
REGULATE
LUBRICATE
50
what doe flow controls do?
Control speed
51
What are the two types of traps and drains?
Mechanical
Electrical
52
What is the purpose of a quick exhaust valve
To quickly dump pressure to atmosphere
53
How do you adjust a flow control valve
Screw
54
What are the two types of check valves?
Gravity
Spring
55
Where is a drain valve located on the receiver
Lowest point of the receiver
56
What is the purpose of a fusible plug?
To melt and release pressure of air temperatures climb to high
57
How is pressure in the receiver monitored?
Air pressure gauge
58
What are the 3 types of seals in a pneumatic cylinder
Piston seal
Rod seal
Rod wiper
59
Which type of pneumatic motor is found in hand tools such as impact guns and die grinders
Vane motors
60
What’s is one pollution produced by pneumatic systems?
Noise pollution
61
How are pneumatic check valves usually held closed
Gravity or light spring
62
What does an ultraviolet filter?
Bacteria viruses mold spores
63
What are two types of automatic drain traps
Mechanical
Electrical
64
In a pneumatic system the compressed air provides the force to
Perform work
65
How can mechanical shock be prevented in a pneumatic cylinder
Cushioning devices
66
What is used for the prevention and removal of moisture in air lines
Air dryers
67
What is used to store compressed air to take up fluctuations in demand and allow the system pressure to vary within reasonable limits
Air receivers
68
What is used to bleed off excess system pressure before it becomes too extreme
Saftey relief valve
69
How is the direction of rotation in a pneumatic motor revered?
By reversing air flow/ lines
70
Where is the air leaving the exhaust port of a 4 way valve directed to?
Atmosphere
71
Lubricating equipment in an air line should be placed after what in a system?
Regulator (if equipped)
72
What is the temperature at which water vapour condenses as it is cooled called?
Dew point
73
Why does oil have to be removed from the air before it enters an air dryer?
It will clog the pores of the desiccant
74
Ina pneumatic cylinder how is the piston speed controlled?
Flow control valve
75
What is the most common problem in a pneumatic system that must be constantly monitored?
Moisture
76
What is used to control the exhaust noise that is produced in a pneumatics system
Silencer (muffler)
77
How is pressure created in a pneumatic system?
Resistance to flow
78
What determines the type of lubrication to be used in a pneumatic system?
What the system is used for
79
What are HEPA filters used for?
Locations where VERY fine particles are to be removed
80
When there is only one flow path for the compressed air and workstation at the end of the system can be subject to air starvation when upstream demand is heavy what system would it be called?
Grid
81
Vaccum occurs when the pressure in a container becomes __________ the pressure surrounding it
Less than
82
What is the purpose of a vaccum pump?
Compresses air from atmospheric pressure to create pressure below atmospheric pressure
83
What is relative humidity
The percentage of moisture in the air at a given time
84
Why is leakage in a pneumatic system such a huge problem
Air compressors are constantly operating to maintain system pressure
85
What are the two types of compression
Isothermal
Adiabatic
86
A pneumatic directional control valve has exhaust ports instead of __________ compared to the hydraulic valve
Return lines
87
When pressure is increased in an enclosed space how will the temperature react
Increases
88
Which law states that at a constant temperature, absolute pressure, varies inversely to the volume
Boyles law
89
The first items to check in a malfunctioning pneumatic system are _____________ and ____________
Flow and pressure
90
What does a barometer measure?
Atmospheric pressure
91
What is the most common contaminate in pneumatic system?
Water
92
What material is used in dryers to absorb the water Vapor?
Desiccant
93
What oil should be used in pneumatic air lines to lubricate components?
Compressed air oil designed for pneumatics
94
What is the primary purpose of a receiver in a pneumatic system?
Provides compressed air storage to meet system demand
95
What system can be used in your industry to best control moisture problems?
HVAC
96
What is the purpose of a quick air exhaust valve
It allows unrestricted air flow to atmosphere
97
What variable controls speed in an impact wrench’s?
Air flow rate
