Pneumatic troubleshooting Flashcards
What results when the air in a compressor is compressed to a smaller volume?
Moisture content increases
Pressure decreases
Pressure increases
Temperature decreases
Pressure increases 
A dynamic air compressor is frequently referred to as a
Liquid ring compressor
Non-positive displacement, compressor
Positive displacement, compressor
Reciprocating compressor
Non-positive displacement, compressor
The size of a compressor air intake filter is determined by the
Compressor duty
Compressor horsepower
Intake requirements,
Number of cylinders 
Intake requirements 
Corrosion resistant piping is used in pneumatic systems to
Extend pipe service life
Improve the appearance of the system
Provide better airflow
Reduce installation costs
Extend pipe service line 
After lubricating oil has been introduced into an airline, what is the recommended maximum distance that the air should travel?
10 feet
20 feet
30 feet
40 feet
30 feet
What kind of drawings should be used to show the interconnections between components
Cutaway
Perspective
Pictorial
Schematic
Pictorial
What is generally illustrated in a schematic drawing?
Component Interconnections
Functions and operations
Internal construction
Physical relationships
Functions and operations
Pilot or signal lines are shown on a schematic drawing as
A series of long dashes
A series of short dashes
Dotted lines
Solid lines
A series of long dashes
A schematic diagram can best be understood if the drawing is
Analyzed as a whole system
Drawn in the proper perspective
Printed on blue paper
Studied in small segments
Studied in small segments
Special schematic symbols are usually devised and drawn by the
Component manufacturer
Component purchaser
Maintenance draftsman
Plant engineering staff
Component manufacturer
In accordance with the American society of manufacturing engineers code, air receivers must be equipped with safety valves, and
Drain valves
Pressure gauges
Pressure control valves
Shut off valves
Pressure gauges
Slightly oversized pipe
Can help accommodate additional demands
May result in pressure loss
Should be avoided for safety reasons
Should be used only for main lines
Can help accommodate additional demands 
What is the proper spacing for pipe supports or hangers?
Close enough to prevent SAG
No less than 3 feet or more than 6 feet
Six times the pipe diameter
Three times the pipe diameter
Close enough to prevent sag
What should you do in an air leak occurs at a flared fitting 
Convert to pipe threads
Re-pipe the system
Replace the flare
Solder the joint
Replace the flare
What is the proper length for hoses used to connect pneumatic components
Only as long as necessary
The actual length +15%
Three times the hose diameter
2 feet longer than required
Only as long as necessary
A good planned maintenance program requires
Daily records to be kept on all piping
A special maintenance group
Regular equipment checks
All equipment to be inspected weekly
Regular equipment checks
A pneumatic system operated with excessive air pressure will usually have
Accelerated wear
Fast operating cycles
Increased production
Reduced maintenance
Accelerated wear
Most control valves in a pneumatic system are designed for use with pressure up to
- Psi.
150 psi
225 psi
300 psi
150 psi 
The best time to perform a daily check on compressor room equipment is
At the end of the shift
Before the shift starts
Early in the shift
Near the middle of the shift
Early in the shift
The operating cycles of control valves and cylinder is used on production lines are usually entered in the
Departmental checklist
Master log sheet
Planned maintenance guide
Production record
Production record
Which of the following determines what troubleshooting checks to make in a pneumatic system?
Complexity of the piping
Sequence of procedures
The systems manufacture
The type and number of components
The type and number of components
When you are troubleshooting a pneumatic system, first, check the
Compressor
Kind of actuator used
Machine blueprint
Supply air pressure
Supply air pressure 
Which of the following would not be in the description section of an operations manual?
Actuating functions
Logic sequence
Signal functions
Troubleshooting procedures
Troubleshooting procedures, 
Piston seals can be checked for leakage by
Checking for improved operation
Increasing the supply, air pressure
Manuel actuation of the piston
Observing the exhaust port for air
Observing the exhaust port for air
Which of the following should you always inspect when troubleshooting a manually operated control valve for sluggish action?
Exhaust ports
Moving parts
Solenoid coils
Supply air pressure
Moving parts 
Heat generated in the cylinder of a compressor during the compression stroke is best controlled by cooling the compressor and
Adding an after cooler
Adding an intercooler
Changing the compression speed
Limiting the compression pressure
Limiting the compression pressure 
An air compressor operating in a dusty or oily atmosphere, should be cleaned at regular intervals with a
Air hose
Detergent
Nylon brush
Water hose
Detergent
Which of the following causes the greatest discharge valve wear in a compressor? 
Ambient air temperatures
Carbon deposits
Compressor speed
Motor horsepower
Carbon deposits
A motor starting controller on a compressor is checked for proper operation by starting the compressor after the
Compressor has been taken out of service
Pressure has built up in the system
Pressure is stabilized
Reservoir pressure has been relieved
Reservoir pressure has been relieved
Which of the following is not a maintenance consideration common to all rotary compressors
Bearings
Intake valves,
Lubrication
Seals
Intake valves
The best way of locating air control valve problems is to analyze the performance of the
Circuit components
Compressor components
Pressure regulator
Receiver, regulator
Circuit components
Loss of power in a pneumatic control circuit can cause a circuit to
Get out of sequence
Have increase sensitivity
Lock into automatic operation
Lock into manual operation
Get out of sequence
What is used to activate a solenoid on a pneumatic control valve?
An electric current
Hydraulic power
Pneumatic power
Solid state rectifier
An electric current 
A control valve that will shift manually, but not automatically is likely to have
Excessive lubrication
High air pressure
High-voltage
Low air pressure 
Low air pressure
The use of an improper lubricant in a control valve may result in all of the following, except
Shifting without a signal
Soft seals,
Swollen seals,
Varnish build up 
Shifting without a signal
What type of pneumatic cylinder is used for most industrial applications?
Flanged
Lock ring
Threaded
Tie rod
Tie rod
The primary purpose of a piston rod bushings is tO
Absorb, piston thrust
Act as a bearing
Improve cushioning
Reduce piston leakage
Act as a bearing
Above what temperature do pneumatic cylinders require special seats
175°F
200°F
225°F
250°F
200°F
Improperly tightened, or torqued tie rods on pneumatic cylinders will cause
Cracked piston rings
Excessive side play
Internal misalignment
Piston leakage
Internal misalignment
What is the function of pneumatic cylinder cushions?
Break the load
Prevent cylinder damage
Prevent tie rod breakage
Regulate stroke, speed
Prevent cylinder damage
The normal service life of air motors can be improved by
Careful handling
Clean filter, the air
Large quantities of oil
Proper storage
Clean filtered air
Which of the following Is a proper lubricant to use when installing hose couplings
Light spindle oil
Non-detergent oil
Soapy solution
Water resistant grease
Soapy solution
Air motors require careful handling during this assembly and assembly because they are
Constructed with loose parts
Lubricated by various methods
Of varying sizes and shapes
Precision built
Precision built
Special attention should be given to the______ of pneumatic grinders
Arbor shafts
Governor flanges
Safety governors
Shaft bearings
Arbor shafts
Radial piston, air motors require less maintenance than other air motors because they have
Fewer parts
Positive lubrication
Slower operating speeds
Subassembly construction
Slower operating speeds
The low pressure in the hydraulic end of an air oil tank system is overcome by the use of
A separate oil pump
Double acting cylinders
High pressure air
Large work cylinders
Large work cylinders
The main components of air oil boosters are the
Air Pistons, and hydraulic rams
Approach and return tanks
Control valves
Hydraulic cylinders
Air pistons and hydraulic rams
What valve adjusts the makeup and return tank, oil levels, and a single pressure booster system
Automatic pressure valve
Manual shut off valve
Pressure differential valve
Standard four-way valve
Manual shut off valve
In a combined single unit air oil cylinder, the fluids are separated by
A bleeder space
A floating piston
A vacuum chamber
Pressurized gas
A bleeder space
One advantage of interlocked independent air oil system is their
Increased speed of operation
Isolated control function
Nonsequential cylinder operation
Separate power sources
Increase the speed of operation
