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2nd 6 Month Final > Pneumatics > Flashcards

Pneumatics Flashcards

1
Q

In a pneumatic system, what provides the force that permits work?

A

Compressed Air

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2
Q

How much work is done by a piston that exerts a force of 15lb through a distance of 10in?

A

150 in-lb.
W = F x D

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3
Q

Heating a gas in sealed, rigid container will _______ the ________ of the gas.

A

Increase; pressure

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4
Q

Two cylinders having different diameters are connected by an air line. 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 the load moves is __________ the distance the smaller piston moves.

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 its pressure _________.

A

Increases; decreases.

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6
Q

A reciprocating compressor is one kind of _________ compressor.

A

Positive-displacement

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7
Q

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

A

Atmospheric pressure

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8
Q

The purpose of an inter cooler between the stages of a two-stage compressor is to reduce the:

A

Power needed to run the compressor.

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9
Q

The purposes of lubricating oil in a compressor are to reduce the friction between the moving parts and to…

A

Improve the cooling of the compressor

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10
Q

The advantage of unloading a compressor is to allow it to….

A

Run without delivering air

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11
Q

Single-stage sliding-vane compressors can produce pressures up to ____ psi.

A

50

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12
Q

Rotary screw compressors run at speeds ranging from _____ to ______ rpm.

A

3000; 12000

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13
Q

Impeller compressors deliver air at ________ volume and _______ pressure.

A

High; low

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14
Q

Compared to other kinds of compressors, centrifugal compressors….

A

Require more power

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15
Q

The most effective method of reducing the output of centrifugal compressors is ________ but my not work well if the reduction is too _____.

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.

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

A

Cool the air

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18
Q

Water cooled after coolers are typically use with ______-capacity compressors that run _____ hours a day.

A

Large; ten or more

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19
Q

A dessicant removes water from air by _________ it.

A

Abosorbing

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20
Q

The main purpose of the receiver in a pneumatic system is to…

A

Maintain pressure during peak demand

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21
Q

The operation of an inertial separator depends on a(n)

A

Rapid change in the direction of air flow

22
Q

Of the particles listed below, the smallest are the _________ particles

A

Aerosol

23
Q

A filter can stop 100 percent of the particles down to a specified minimum size. This size is called the filter’s __________ rating.

A

Absolute

24
Q

An advantage of wetted filters over dry filters is the at wetted filters…

A

Can be cleaned many times

25
Q

A fine mist lubricator should be used in a pneumatic system if the air flow is _________ and/or the distance to the equipment is _________.

A

Intermittent; long

26
Q

Laminar air flow in a piping system is made turbulent by

A

Obstructions in the pipe

27
Q

Greater pressure losses occur in a pneumatic system if the air is at _________ pressure, because of greater _________.

A

Low; Friction

28
Q

When used as a compressor discharge line, a pipe run should slope ________ in the direction of the airflow by 1 inch for every _____ feet of pipe

A

Downward; 10

29
Q

When should you use pipe joint compound in connecting NPT-threaded pipe?

A

Always

30
Q

If an air hose is not completely depressurized when you disconnect it, the greatest danger to you is a sudden…

A

Blowing of dust chips

31
Q

A four-way valve has four:

A

Connection points

32
Q

The ________ valve is a good throttling device and is suitable for high-pressure service. It causes _____ pressure loss in the line.

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.

A

Sliding; easy

34
Q

An advantage of four-way valves over two and three way valves is that they

A

Simplify the controls

35
Q

A valve has five connecting ports, two of which are exhaust ports. This valve is a ________ valve.

A

Four-way

36
Q

The cracking pressure or a poppet-type relief valve is determined by the

A

Spring Adjustment

37
Q

A diaphragm-type relief valve responds very quickly to pressure change because of its

A

Large pressure-sensitive are

38
Q

The only purpose of a pressure relief valve is to

A

Protect the system from damage

39
Q

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

A

Slightly closes

40
Q

The best way to guard against excessive pressure on the secondary side of a pressure regulator is to

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.

A

Greater than

42
Q

An internal spring is sometimes used in the return of the piston in a ________-acting _______-rod pneumatic cylinder

A

Single; single

43
Q

The main purpose of an exhaust flow control metering valve on a pneumatic cylinder is to

A

Limit the return-stroke speed

44
Q

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

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.

A

Capacity coefficient

46
Q

The highest torque a pneumatic motor can exert on a load is it’s _________ torque.

A

Stalling

47
Q

The horsepower of a pneumatic motor varies with the ______ and the ______ of the motor shaft.

A

Speed; torque

48
Q

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

A

Medium

49
Q

An axial-piston pneumatic motor transmits force form the piston to the output shaft by means of a

A

Cam plate and gears

50
Q

Air pressure of 100 psi can create hydraulic pressure of 1000psi if an air piston drives a ________ hydraulic piston(s)

A

Smaller-diameter

2nd 6 Month Final (11 decks)

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