Pneumatic troubleshooting

Question 1

What results when the air in a compressor is compressed to a smaller volume?

Moisture content increases
Pressure decreases
Pressure increases
Temperature decreases

Answer 1

Pressure increases 

Question 2

A dynamic air compressor is frequently referred to as a

Liquid ring compressor
Non-positive displacement, compressor
Positive displacement, compressor
Reciprocating compressor

Answer 2

Non-positive displacement, compressor

Question 3

The size of a compressor air intake filter is determined by the

Compressor duty
Compressor horsepower
Intake requirements,
Number of cylinders 

Answer 3

Intake requirements 

Question 4

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

Answer 4

Extend pipe service line 

Question 5

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

Answer 5

30 feet

Question 6

What kind of drawings should be used to show the interconnections between components

Cutaway
Perspective
Pictorial
Schematic

Answer 6

Pictorial

Question 7

What is generally illustrated in a schematic drawing?

Component Interconnections
Functions and operations
Internal construction
Physical relationships

Answer 7

Functions and operations

Question 8

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

Answer 8

A series of long dashes

Question 9

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

Answer 9

Studied in small segments

Question 10

Special schematic symbols are usually devised and drawn by the

Component manufacturer
Component purchaser
Maintenance draftsman
Plant engineering staff

Answer 10

Component manufacturer

Question 11

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

Answer 11

Pressure gauges

Question 12

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

Answer 12

Can help accommodate additional demands 

Question 13

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

Answer 13

Close enough to prevent sag

Question 14

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

Answer 14

Replace the flare

Question 15

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

Answer 15

Only as long as necessary

Question 16

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

Answer 16

Regular equipment checks

Question 17

A pneumatic system operated with excessive air pressure will usually have

Accelerated wear
Fast operating cycles
Increased production
Reduced maintenance

Answer 17

Accelerated wear

Question 18

Most control valves in a pneumatic system are designed for use with pressure up to

75. Psi.
    150 psi
    225 psi
    300 psi

Answer 18

150 psi 

Question 19

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

Answer 19

Early in the shift

Question 20

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

Answer 20

Production record

Question 21

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

Answer 21

The type and number of components

Question 22

When you are troubleshooting a pneumatic system, first, check the

Compressor
Kind of actuator used
Machine blueprint
Supply air pressure

Answer 22

Supply air pressure 

Question 23

Which of the following would not be in the description section of an operations manual?

Actuating functions
Logic sequence
Signal functions
Troubleshooting procedures

Answer 23

Troubleshooting procedures, 

Question 24

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

Answer 24

Observing the exhaust port for air

Question 25

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

Answer 25

Moving parts 

Question 26

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

Answer 26

Limiting the compression pressure 

Question 27

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

Answer 27

Detergent

Question 28

Which of the following causes the greatest discharge valve wear in a compressor?  Ambient air temperatures Carbon deposits Compressor speed Motor horsepower

Answer 28

Carbon deposits

Question 29

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

Answer 29

Reservoir pressure has been relieved

Question 30

Which of the following is not a maintenance consideration common to all rotary compressors Bearings Intake valves, Lubrication Seals

Answer 30

Intake valves

Question 31

The best way of locating air control valve problems is to analyze the performance of the Circuit components Compressor components Pressure regulator Receiver, regulator

Answer 31

Circuit components

Question 32

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

Answer 32

Get out of sequence

Question 33

What is used to activate a solenoid on a pneumatic control valve? An electric current Hydraulic power Pneumatic power Solid state rectifier

Answer 33

An electric current 

Question 34

A control valve that will shift manually, but not automatically is likely to have Excessive lubrication High air pressure High-voltage Low air pressure 

Answer 34

Low air pressure

Question 35

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 

Answer 35

Shifting without a signal

Question 36

What type of pneumatic cylinder is used for most industrial applications? Flanged Lock ring Threaded Tie rod

Answer 36

Tie rod

Question 37

The primary purpose of a piston rod bushings is tO Absorb, piston thrust Act as a bearing Improve cushioning Reduce piston leakage

Answer 37

Act as a bearing

Question 38

Above what temperature do pneumatic cylinders require special seats 175°F 200°F 225°F 250°F

Answer 38

200°F

Question 39

Improperly tightened, or torqued tie rods on pneumatic cylinders will cause Cracked piston rings Excessive side play Internal misalignment Piston leakage

Answer 39

Internal misalignment

Question 40

What is the function of pneumatic cylinder cushions? Break the load Prevent cylinder damage Prevent tie rod breakage Regulate stroke, speed

Answer 40

Prevent cylinder damage

Question 41

The normal service life of air motors can be improved by Careful handling Clean filter, the air Large quantities of oil Proper storage

Answer 41

Clean filtered air

Question 42

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

Answer 42

Soapy solution

Question 43

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

Answer 43

Precision built

Question 44

Special attention should be given to the______ of pneumatic grinders Arbor shafts Governor flanges Safety governors Shaft bearings

Answer 44

Arbor shafts

Question 45

Radial piston, air motors require less maintenance than other air motors because they have Fewer parts Positive lubrication Slower operating speeds Subassembly construction

Answer 45

Slower operating speeds

Question 46

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

Answer 46

Large work cylinders

Question 47

The main components of air oil boosters are the Air Pistons, and hydraulic rams Approach and return tanks Control valves Hydraulic cylinders

Answer 47

Air pistons and hydraulic rams

Question 48

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

Answer 48

Manual shut off valve

Question 49

In a combined single unit air oil cylinder, the fluids are separated by A bleeder space A floating piston A vacuum chamber Pressurized gas

Answer 49

A bleeder space

Question 50

One advantage of interlocked independent air oil system is their Increased speed of operation Isolated control function Nonsequential cylinder operation Separate power sources

Answer 50

Increase the speed of operation