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1 Teepeesee Flashcards

1
Q

In a pneumatic system what provides force that performs work?

A

Compressed air

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2
Q

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

A

150 in-lbs

Work = force x piston travel

Work = 15 x 10 = 150

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3
Q

Heating a gas in a scaled 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 it’s 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 intercooler between the stages of a 2-stage compressor is to reduce the:

A

The power needed to run the compressor

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9
Q

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

A

Improve 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 to 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 efficient method of reducing the output of centrifugal compressors is _______ ________ but may 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 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 used with _____-capacity compressors that run _______ hours a day

A

Large; more than 10

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19
Q

A dessicant removes water from air by ________ it.

A

Absorbing

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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

Aerosols

23
Q

A filter can stop 100% of particles down to a specific size. The size is called the filter’s ________ rating

A

Absolute

24
Q

An advantage of wetted filters over dry filters is that 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 airflow in a piping system is made turbulent by:

A

Constrictions in the pipe

27
Q

Greater pressure losses occur in a pneumatic system if the air is at _____ pressure because of greater____________.

A

Low; high friction

28
Q

When used as a compressor discharge line, a pipe run should slope _______ in the direction of the airflow by 1 in for every ____ft of pipe

A

Downwards; 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 or chips

31
Q

A four-way valve has four:

A

Connecting ports

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 2 or 3 way valves is that they:

A

Simplify the controls

35
Q

A valve has 5 connecting parts, two of which are exhaust ports. This valve is a _______ valve

A

Four-way

36
Q

The cracking pressure of a simple poppet-type relief valve is determined by the:

A

Spring adjustment

37
Q

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

A

Large pressure-sensitive area

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 to return the piston in a _______-acting, ________-rod pneumatic system.

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 its _________ 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 it’s speed is:

A

Medium

49
Q

The axial-position pneumatic motor transmits force from 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 1000 psi if an air piston drives a _____________ hydraulic piston (s).

A

Smaller diameter

Ok (13 decks)

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