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6 Month 3 > Basic Pneumatics > Flashcards

Basic Pneumatics Flashcards

1
Q

In a pneumatic system, what provides the force that performs work

Air compressor
Atmosphere
Compressed air
Hose or pipe

A

Compressed air

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2
Q

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

A

150 inch pounds

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3
Q

Heating a gas in a sealed rigid container will _____ the ______ of the gas

Decrease volume
Increase pressure
Increase volume
Not affect, pressure or volume

A

Increase pressure

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4
Q

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

A

Greater than less than

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5
Q

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

A

Increases decreases

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6
Q

A reciprocraing compressor is one kind of______ compressor

Dynamic
Positive displacement
Rotary
Two-stage

A

Positive displacement

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7
Q

In a typical reciprocating compressor, the intake valves are forced open by the

Atmospheric pressure
Solenoid
Spring
Timing gears

A

Atmospheric pressure

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8
Q

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

A

Power needed to run the compressor

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9
Q

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

A

Improve the cooling of the compressor

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10
Q

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

A

Run without delivering air

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11
Q

Single stage sliding vane compressors can produce pressures up to______ psi

25
50
75
100

A

50

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12
Q

Rotary screw compressors run at speeds ranging from______to______rpm

30; 120
300; 1200
3000; 12,000
30,000; 120,000

A

3000; 12,000

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13
Q

Impeller compressors, deliver air at_____ volume and_____ pressure

hi; hi
Hi; low
Low, hi
Low; low

A

Hi; low

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14
Q

Compared to other kinds of compressors, centrifugal compressorS

Are more efficient
Deliver higher pressures
Require less intercooling
Require more power

A

Require more power 

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15
Q

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

A

Speed variation; large

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16
Q

Water often collects in a pneumatic system, because when air is compressed, it’s___decreases

Dewpoint
Moisture capacity
Relative humidity
Temperature

A

Moisture capacity

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17
Q

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

A

Cool, the air

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18
Q

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

A

Large; 10 or more

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19
Q

A desiccant removes water from air by____ it

Absorbing
Centrifuging
Condensating
Heating

A

Absorbing

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20
Q

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

A

Maintain pressure during peak demand

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21
Q

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

A

Rapid change in the direction of airflow

22
Q

Of the particles listed below the smallest are the_____ particles

Aerosol
Cloud
Dust
Smoke

A

Aerosol

23
Q

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

A

Absolute

24
Q

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

A

Can be cleaned many times

25
Q

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

A

Intermittent long

26
Q

Laminar airflow in a piping system is made turbulent by

Constrictions in the pipe
Large pipe diameters
Smooth pipe walls
Straight sections of pipe

A

Constrictions in the pipe 

27
Q

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

A

Low; friction 

28
Q

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

A

Downward; 10 

29
Q

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

A

Always

30
Q

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

A

Blowing of dust or chips 

31
Q

A four-way valve has four
Connecting ports
Functions
Outlets
Positions

A

Connecting ports

32
Q

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

A

Needle; high

33
Q

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

A

Sliding; easy

34
Q

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

A

Simplify the controls

35
Q

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

A

Four way

36
Q

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

A

Spring adjustment 

37
Q

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

A

Large pressure sensitive area 

38
Q

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

A

Protect the system from damage 

39
Q

An increase in pressure on the secondary side of a pressure regulating valve______ the valve

Fully closes
Fully opens
Slightly closes
Slightly opens

A

Slightly closes 

40
Q

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

A

Use a regulator with a built-in relief valve

41
Q

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 

A

Greater than

42
Q

An internal spring is sometimes used to return the piston in a______ acting______ Rod pneumatic cylinder
Double; double
Double; single
Single; double
Single; single 

A

Single; single

43
Q

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

A

Limit the return stroke, speed 

44
Q

A cylinder that must be free to pivot, requires a(n) _____ mounting

End lug
Side tapered hole
Square flanged
Trunnion or Clevis

A

Trunnion or Clevis

45
Q

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

A

Capacity coefficient 

46
Q

The highest torque of a pneumatic motor can exert on a load is it’s____ torque

Linear
Running
Stalling
Starting

A

Stalling 

47
Q

The horsepower of a pneumatic motor varies with the_____ and the_____ of the motor shaft

Speed; diameter
Speed; torque
Torque; diameter
Torque; Length

A

Speed; torque

48
Q

The highest power output of a pneumatic motor occurs when a speed is

Aero
Minimum
Medium
Maxximum

A

Medium 

49
Q

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

A

Cam plate and gears

50
Q

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

A

Smaller diameter

6 Month 3 (20 decks)

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