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TPC > Test 3 - Pneumatics > Flashcards

Test 3 - Pneumatics Flashcards

1
Q

In a pneumatic system, the compressed air provides the force to ???

A
  • perform work
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2
Q

The inertia of an object is its ???

A
  • resistance to movement
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3
Q

The abbreviation PSIG means ???

A
  • pressure per square inch, gage
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4
Q

Which of the following factors determines the amount of work done by a pneumatic cylinder?

A
  • cylinder stroke
  • air pressure
  • cylinder bore
  • all of the above
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5
Q

What type of energy is produced by an air compressor?

A
  • pneumatic
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6
Q

Using the formula P1 x V1 = P2 x V2, find P2 if P1 = 100 (psig), V1 = 100, V2 = 10. (remember to do all calculations in psia.)

A
  • 1,132 (psig)
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7
Q

What happens when heat is applied to gas contained in a cylinder?

A
  • the pressure increases
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8
Q

The force that permits a small amount of pressure to move a larger object is called ???

A
  • pneumatic leverage
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9
Q

If the small piston in a pneumatic system having a 2.5-to1 leverage increase travels 5 inches, how far will the large piston travel?

A
  • 2 inches
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10
Q

Bernoulli’s principle states that the total energy (potential + kinetic) of a gas always ???

A
  • remains constant
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11
Q

To be efficient, a positive displacement compressor must decrease the air’s ???

A
  • volume
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12
Q

Dynamic compressors increase air pressure by ???

A
  • accelerating the air
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13
Q

The discharge valves of a compressor are opened by ???

A
  • compressed air
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14
Q

In which of the following ways are discharged valves closed?

A
  • air pressure
  • spring pressure
  • intake pison stroke
  • all of the above
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15
Q

In multistage compressors, the required air pressure is created by compressing the air in ???

A
  • two or more unequal cylinders
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16
Q

Of what benefit is the use of an intercooler in a multistage compressor?

A
  • decreases horsepower requirements
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17
Q

Air-cooled compressors are usually constructed with ???

A
  • cooling fins
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18
Q

Water or liquid intercoolers are usually patterened after which of the following?

A
  • shell and tube heat exchangers
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19
Q

What lubrication method is used for heavy-duty compressors?

A
  • pressurized
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20
Q

When a compressor is relieved of all internal pressure, it is said to be ???

A
  • unloaded
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21
Q

What is the maximum discharge pressure of a single-stage sliding vane compressor?

A
  • 50 psi
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22
Q

What type of compressor will deliver large amounts of oil-free air at approximately 100 psi?

A
  • rotary dry screw
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23
Q

The compressing lobes of a wet screw compressor are driven without ???

A
  • timing gears
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24
Q

Impeller compressors are frequently referred to as ???

A
  • blowers
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25
Q

Impeller compressors use the same operating principle as ???

A
  • gear pumps
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26
Q

What type of positive displacement compressors is best suited for light-duty applications?

A
  • disphragms
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27
Q

A centrifugal compressor is classified as a ???

A
  • dynamic compressor
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28
Q

The impellers of dynamic compressors rotate at high speeds to ensure

A
  • efficient operation
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29
Q

The most effiecient method of controlling the output of a centrifugal compressor is by ???

A
  • speed cariation
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30
Q

The term used to describe the measured capacity of a compressor after it is installed is ???

A
  • actual cubic feet per minute
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31
Q

The most common contaminants in the air are dirt and ???

A
  • water vapour
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32
Q

When washing a primary air filter, be sure to use ???

A
  • a recommended solvent
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33
Q

What term is used to compare the amount of moisture in the air to what it could contain?

A
  • relative humidity
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34
Q

The amount of moisture that can be held in air decreses as the ???

A
  • pressure increases
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35
Q

What term best describes the condensation temperature of water vapor?

A
  • dew point
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36
Q

Which of the folowing is the best method of removing vapour from compressed air?

A
  • condensation
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37
Q

Which method of heat transfer is used in a shell and tube heat exchanger?

A
  • counterflow
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38
Q

What else can be used if the desired dew point temperature for a pneumatic system cannot be obtained with an aftercooler?

A
  • a second cooler
  • a refridgerated dryer
  • a chiller
  • all the above
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39
Q

Most moisture separators remove liquids from a pneumatic system by ???

A
  • mechanical separation
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40
Q

What type of air dryer uses a chemical agent that absorbs moisture from the air?

A
  • deliquescent
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41
Q

What type of contaminant separation takes place when a stream of air is slowed down?

A
  • gravity
42
Q

Because of their ability to stop large particles, inertial separators are used as ???

A
  • pre-filters
43
Q

Contaminant particle size is measured in ???

A
  • microns
44
Q

A strainer or filter is classified by the ???

A
  • size of particle it stops
45
Q

The largest percentage of a given particle size that a filter will stop determines its ???

A
  • nominal rating
46
Q

What occurs when part of the filter medium breaks off and is carried along with the air?

A
  • medium migration
47
Q

The most efficient way of removing large particles from the airstream is by using a ???

A
  • surface filter
48
Q

Which type of filter primarily uses a medium that collects moisture on the medium surface?

A
  • adsorption
49
Q

What type of oil is used to lubricate pneumatic equipment?

A
  • uncontaminated
50
Q

The best point in a pneumatic system to place lubricating equipment is after the ???

A
  • regulator
51
Q

What is commonly used to carry or contain the compressed air in a pneumatic system?

A
  • hose
  • pipe
  • tubing
  • all the above
52
Q

The streamline or laminar flow of air in a pipe is necessary to ???

A
  • improve efficiency
53
Q

Selected air lines should be large enough in diameter to minimize the ???

A
  • pressure drop
54
Q

How does a change in air pressure in a pipe affect the pressure losses?

A
  • decreased pressure, higher losses
55
Q

The pressure loss through fittings and valves is calculated in terms of ???

A
  • feet of straight pipe
56
Q

Which of the following is commonly used to construct the main headers in a pneumatic system?

A
  • pipe
57
Q

What should the rate of slope for compressed air piping be?

A
  • 1” inch / per 10’ feet
58
Q

Flared connections that have long-shouldered nuts are used to ???

A
  • provide support
59
Q

Most nonmetallic tubing used in pneumatic lines is limited to conditions of ???

A
  • 100 psi and 190°F
60
Q

Which of the following is provided by hoses that connect pneumatic equipment?

A
  • vibration insulation
  • noise insulation
  • flexible connections
  • all of the above
61
Q

A manually operated flow control valve may be further identified by which of the following?

A
  • number of control positions
  • type of control element
  • number of connecting ports
  • all of the above
62
Q

Manually operated stop or isolating valves (globe, gate, or ball) are classed as ???

A
  • two-way valves
63
Q

The high-pressure losses in a needle valve are caused by the ???

A
  • valve seat
64
Q

What is the most common method of actuating automatically operated flow control valves?

A
  • electric solenoids
65
Q

The amount of air that can pass through a direct-acting, two-way, solenoid-operated valve is limited by the ???

A
  • spring force
66
Q

An automatic check valve can be further classified as a ???

A
  • two-way, two-position valve
67
Q

A three-way valve is constructed with three ???

A
  • primary connections
68
Q

Two-position, three-way valves are usually held in a nonactuated position by ???

A
  • a spring
69
Q

Compressed air returbing through a four-way valve after it has done work is usually directed to the ???

A
  • atmosphere
70
Q

In how many directions can air flow in a nonactuated two-position, four-way valve?

A
  • two
71
Q

The primary purpose of all the pressure controls in a pneumatic system is to ???

A
  • limit air pressure
72
Q

Which of the following types of valves control the maximum allowable pressure limit in a pneumatic system?

A
  • safety
73
Q

What is the best location for a pressure regulating valve in a pneumatic system?

A
  • at an air station
74
Q

Pressure relief valves are usually adjusted to open at what pressure level?

A
  • above the control valve setting
75
Q

Initially, at what pressure does a relief valve open?

A
  • cracking
76
Q

Which of the following types of relief valves provides the smoothest relief control?

A
  • diaphragm
77
Q

When ordinary non-precision regulators operate, they ???

A
  • modulate slightly
78
Q

Remote-controlled regulators will not function without ???

A
  • regulated pilot air
79
Q

Which of the following types of valves is used to regulate a high volume air line?

A
  • booster relay
80
Q

Air hoses used to blow chips are required by Federal law to have pressure regulators set at a maximum pressure of ???

A
  • 29 psi
81
Q

The service life of a pneumatic cylinder is improved with ???

A
  • lubrication
82
Q

The major difference between pneumatic and hydraulic cylinders is the ???

A
  • absence of return lines
83
Q

A cylinder that produces work only on its return stroke is called a ???

A
  • single-acting cylinder
84
Q

Piston travel speed is commonly controlled by ???

A
  • metered outlet air
85
Q

Piston rings (or cups) and seals of pneumatic cylinders are usually made of ???

A
  • synthetic materials
86
Q

A pneumatic cylinder furnished with the mounting lugs or feet is classified as being ???

A
  • fixed, noncenterline mounted
87
Q

The amount of motion in a pivoting cylinder should be restricted to prevent the ???

A
  • piston rod from bending
88
Q

Which of the following items must be considered when determining the size of a cylinder required to move a particular load?

A
  • pressure losses
  • coefficient of friction
  • weight of load
  • all of the above
89
Q

When selecting a cylinder, always make sure that the cylinder ports are the same size as the ???

A
  • control valve ports
90
Q

Mechanical show can be prevented in a pneumatic cylinder by using ???

A
  • cushioning devices
91
Q

What type of energy is produced by a pneumatic motor?

A
  • mechanical energy
92
Q

Pneumatic motors are classified according to their ???

A
  • driving elements and principle of operation
93
Q

All pneumatic motors are constructed with a mechanical seal and operate on the principle of ???

A
  • positive displacement
94
Q

Pneumatic motor torque is classified under which of the following categories?

A
  • starting torque
  • running torque
  • stalling torque
  • all of the above
95
Q

The horsepower output of a pneumatic motor is calculated on the basis of the motor’s ???

A
  • torque and speed
96
Q

Which of the following is most important to consider when selecting a pneumatic motor?

A
  • air consumption
97
Q

An advantage of pneumatic motos over hydraulic motors is that they are ???

A
  • portable
98
Q

Which of the following basic construction designs is used for pneumatic motors?

A
  • axial piston
  • rotary piston
  • rotary vane
  • all of the above
99
Q

The direction of rotation in a pneumatic motor is reversed by means of ???

A
  • reversing the airflow
100
Q

A vane pneumatic motor is usually used to power ???

A
  • portable grinders

TPC (5 decks)

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