Basic Pneumatics Flashcards
In a pneumatic system, what provides the force that performs work
Air compressor
Atmosphere
Compressed air
Hose or pipe
Compressed air
How much work is done by a piston that exerts a force of 15 pounds through a distance of 10 inches
15 foot pounds
25 inch pounds
115 inch pounds
150 inch pounds
150 inch pounds
Heating a gas in a sealed rigid container will _____ the ______ of the gas
Decrease volume
Increase pressure
Increase volume
Not affect, pressure or volume
Increase pressure
Two cylinders having different diameters, are connected by an airline. A force applied to the smaller piston makes it move. In response, the larger piston, exerts a force on a load, and makes it move. The force on the load is____ the force applied to the smaller piston, and the distance to load moves is______ the distance, the smaller piston moves
Equal to equal to
Greater than greater than
Greater than less than
Less than greater than
Greater than less than
When air flowing in a pipe reaches a section where the diameter is reduced, the speed of the air______ and it’s pressure_____
Decreases decreases
Decreases increases
Increases decreases
Increases increases
Increases decreases
A reciprocraing compressor is one kind of______ compressor
Dynamic
Positive displacement
Rotary
Two-stage
Positive displacement
In a typical reciprocating compressor, the intake valves are forced open by the
Atmospheric pressure
Solenoid
Spring
Timing gears
Atmospheric pressure
The purpose of an inner cooler between the stages of a two-stage compressor is to reduce the
Need for a third stage
Power needed to run the compressor
Pressure of the air delivered
Volume of the air delivered
Power needed to run the compressor
The purpose of lubricating oil in a compressor, or to reduce friction between the moving parts, and two
Improve the cooling of the compressor
Introduce oil into the compressed air
Remove water from the compressed air
Trap impurities in the incoming air
Improve the cooling of the compressor
The advantage of unloading a compressor is to allow it to
Deliver less air to the system
Run at lower speed
Run without delivering air
Shut down safely
Run without delivering air
Single stage sliding vane compressors can produce pressures up to______ psi
25
50
75
100
50
Rotary screw compressors run at speeds ranging from______to______rpm
30; 120
300; 1200
3000; 12,000
30,000; 120,000
3000; 12,000
Impeller compressors, deliver air at_____ volume and_____ pressure
hi; hi
Hi; low
Low, hi
Low; low
Hi; low
Compared to other kinds of compressors, centrifugal compressorS
Are more efficient
Deliver higher pressures
Require less intercooling
Require more power
Require more power 
The most effective method of reducing the output of centrifugal compressor is_____ but May not work well if the restriction is two_____
Discharge throttling; small
Suction throttling; quick
Recirculation; gradual
Speed variation; large
Speed variation; large
Water often collects in a pneumatic system, because when air is compressed, it’s___decreases
Dewpoint
Moisture capacity
Relative humidity
Temperature
Moisture capacity
The most common way to remove water vapor from the air, leaving a compressor is tO
Cool, the air
Heat the air
pass the air through a filter
Spray oil into the air
Cool, the air
Water cooled, after coolers are typically used with_____ capacity compressors that run_____ hours a day
Large; less than eight
Large; 10 or more
Small; less than eight
Small; 10 or more
Large; 10 or more
A desiccant removes water from air by____ it
Absorbing
Centrifuging
Condensating
Heating
Absorbing
The main purpose of the receiver in a pneumatic system is to
Maintain pressure during peak demand
Reduce vibrations in the air supply
Trap moisture in the system
Turn the compressor on and off
Maintain pressure during peak demand
The operation of an internal separator depends on a
Large reduction in the speed of air
Rapid change in the direction of air flow
Supply a very clean, incoming air
Unobstructed flow path of incoming air
Rapid change in the direction of airflow
Of the particles listed below the smallest are the_____ particles
Aerosol
Cloud
Dust
Smoke
Aerosol
A filter can stop 100% of the particles down to a specified minimum size. This size is called the filters._____ rating
Absolute
Effective
Nominal
Performance
Absolute
And advantage of wetted filters over a dry filters is that wetted filters
Add oil to the airstream
Can be cleaned many times
Cost much less to install
Cost much more to service
Can be cleaned many times
A fine mist lubricator should be used in a pneumatic system, if the airflow is_____ and or the distance is to the equipment is_____
Continuous long
Continuous short
Intermittent long
Intermittent short
Intermittent long
Laminar airflow in a piping system is made turbulent by
Constrictions in the pipe
Large pipe diameters
Smooth pipe walls
Straight sections of pipe
Constrictions in the pipe 
Greater pressure losses occur in a pneumatic system if the air is at_____ pressure, because of greater______
High; friction
High; moisture content
Low; friction
Low; moisture content
Low; friction 
When used as a compressor discharge line, a pipe run should slope_____ in the direction of the air flow by 1 inch for every____ feet of pipe
Downward; 8
Downward; 10
upward; 8
Upward; 10
Downward; 10 
When should you use pipe joint compound in connecting NPT threaded pipe?
Always
Only if the joint cannot be tightened fully
Only if the joint leaks under pressure
Never
Always
If an air hose is not completely depressurized when you disconnect it, the greatest danger to you is a sudden
Blowing of dust or chips
broken coupling pieces
Noise from escaping air
Start up of the compressor
Blowing of dust or chips 
A four-way valve has four
Connecting ports
Functions
Outlets
Positions
Connecting ports
The ____ valve is a good throttling device and is suitable for high pressure service. It causes ______pressure loss it the line
Ball;high
Ball;low
Needle; high
Needle; low
Needle; high
The spool in a valve controls the flow of air by______ from one position to another. In a high pressure system, the spool is._____to move
Rotating; difficult
Rotating; easy
Sliding; difficult
Sliding; easy
Sliding; easy
An advantage of four way valves over two way valves and three way valves is that they
Cause less turbulence
Cost less than two way valves
Reduce the pressure
Simplify the controls
Simplify the controls
A valve has five connecting parts, two of which are exhaust ports. The valve is a._____valve
Two function
Three position
Four way
Five ways
Four way
The cracking pressure of a simple poppet type relief valve is determined by the
Attached flow sensor
Resilient material of the seal
Size of the line
Spring adjustment
Spring adjustment 
A diaphragm type relief valve responds very quickly to a pressure change because of its
Body size
Large pressure sensitive area
Outlet port location
Spring design
Large pressure sensitive area 
The only purpose of a pressure relief valve is to
Maintain the proper pressure of the line
Protect the system from damage
Release all the pressure from the line
Set the systems operating pressure
Protect the system from damage 
An increase in pressure on the secondary side of a pressure regulating valve______ the valve
Fully closes
Fully opens
Slightly closes
Slightly opens
Slightly closes 
The best way to guard against excessive pressure on the secondary side of a pressure regulator is to
Add a relief valve on the primary side
Add a relief valve on the secondary side
Use a regulator with a built-in relief valve
Watch the pressure gauge carefully
Use a regulator with a built-in relief valve
The thrust that can be applied when the rod of a single Rod, double acting pneumatic cylinder is moving out of the cylinder is_______ The thrust that can be applied when the rod is moving into the cylinder
Added to
Subtracted from
Greater than
Less than 
Greater than
An internal spring is sometimes used to return the piston in a______ acting______ Rod pneumatic cylinder
Double; double
Double; single
Single; double
Single; single 
Single; single
The main purpose of an exhaust flow control metering valve on a pneumatic cylinder is to
Absorb shock
Limit the power stroke, speed
Limit the return stroke, speed
Prevent an airlock from occurring
Limit the return stroke, speed 
A cylinder that must be free to pivot, requires a(n) _____ mounting
End lug
Side tapered hole
Square flanged
Trunnion or Clevis
Trunnion or Clevis
You can determine whether a control valve can deliver air rapidly enough for a cylinder by calculating the ______required by the valve
Capacity coefficient
Cylinder volume
Outlet diameter
Pressure rating
Capacity coefficient 
The highest torque of a pneumatic motor can exert on a load is it’s____ torque
Linear
Running
Stalling
Starting
Stalling 
The horsepower of a pneumatic motor varies with the_____ and the_____ of the motor shaft
Speed; diameter
Speed; torque
Torque; diameter
Torque; Length
Speed; torque
The highest power output of a pneumatic motor occurs when a speed is
Aero
Minimum
Medium
Maxximum
Medium 
An axial piston pneumatic motor transmits force from the piston to the output shaft by means of a
Cam plate and gears
Five-Sided valve block.
Rotary valve
Set of veins in the inlet chamber
Cam plate and gears
Air pressure of 100 psi can create hydraulic pressure of 1000 psi is an air person drives a______ hydraulic piston(s)
Large diameter
Small diameter
Set of 10
Shorter stroke
Smaller diameter
