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DWR PNEUMATICS > Industrial Pneumatics > Flashcards

Industrial Pneumatics Flashcards

1
Q

The inefficiency in a pneumatic system is generally the result of

A

The necessary loss of heat during air compression, friction, and fluid changing direction

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2
Q

A common way of sensing tank, pressure and controlling actuation and de actuation of a relatively small (5-10HP) compressor is

A

With a pressure switch

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3
Q

The safety relief valve is normally a closed or open valve

A

Closed or non-passing

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4
Q

The pressure regulator is normally a closed or open valve

A

Open or passing valve

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5
Q

The double acting cylinder has a port at each end of the cylinder, body by which air under pressure can

A

Enter or exhaust

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6
Q

What are used to describe components in pneumatic systems

A

Symbols

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7
Q

Compressors convert the mechanical energy provided by a prime mover into

A

The potential energy of compressed air

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8
Q

To accomplish useful work with a pneumatic system, a device is needed, which can supply a sufficient amount of air at a desired pressure. What is this device?

A

This device is a compressor

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9
Q

When the crankshaft pulls the piston in one direction,_______ is formed within the bore.

A

An increasing volume

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10
Q

______ is formed within the housing as the rotor is turned

A

An increasing and decreasing volume

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11
Q

It is more efficient to compress a gas to

A

Higher pressures in numerous stages

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12
Q

While unloading a compressor, inlet valve regulation holds open the inlet valve when there is no demand for air.

A

This allows the air to sweep in and out of the inlet valve, as the piston moves in the bore.

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13
Q

When air cools it’s ability to carry_____ also decreases

A

Water vapor

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14
Q

Has air passes to the air receiver

A

It has less potential energy then when it entered, it is cooler, cleaner, and holds less water.

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15
Q

After the air has left, the aftercooler and/or dryer,

A

It is directed to a receiver or storage tank.

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16
Q

ASME stands for

A

American Society of mechanical engineers

17
Q

Simple in construction, consisting of a central main with small feeder lines, and headers

A

Grid piping system

18
Q

When flow passes through the check valve, this is defined as

A

The check valves, free flow direction

19
Q

A cylinder in which air pressure is applied to the movable element in only One Direction

A

Single acting cylinder

20
Q

A cylinder in which air pressure may be alternately applied to a piston attached to a movable element to drive it in either direction

A

Double Acting cylinder

21
Q

What does a solenoid consist of?

A

It basically consists of a plunger and a wire coil. The coil is wound on a bobbin, which is installed in a magnetic frame.

22
Q

How does a solenoid operate?

A

When the electric current passes through the coil, a magnetic field is generated. The magnet attracts the plunger and pulls it into the coil. It can cause a spool to move or seal off a surface.

23
Q

What type of flow path does a ball valve have?

A

A ball valve has a flow path which is almost straight through its center

24
Q

The most common type of flow control valve found in a pneumatic system is

A

The needle valve with a bypass check

25
Q

What does meter out mean?

A

This controls the speed of the air, exiting on extension or return in a cylinder

26
Q

What does meter in mean?

A

This controls the speed entering a cylinder on the return or extend phase

27
Q

What reduces the noise and oil content of the air?

A

A pneumatic silencer

28
Q

A pressure regulator must be able to output air at a constant pressure, regardless of

A

Pressure variation from the upstream pressure and independent of flow

29
Q

What can wash away lubrication and in any quantity will cause rust to form

A

Moisture

30
Q

What is placed in the airline at the workstation to be protected?

A

Airline filter

31
Q

Many of the filters manufactured and make use of polycarbonate for bowl materials, because

A

It is generally a good material for filters and lubricators, because it is transparent and tough

32
Q

Airline lubricators, when injected into the flowing airstream, the oil can take on several forms

A

Drops sprays or mist

33
Q

FRL stands for

A

Filter, regulator lubricator

34
Q

What are five elements of a pneumatic system?

A

Power source, pressure, switch, air, conductors, directional, control valve, actuator

35
Q

In unloader valve allows a compressor to

A

Start up with no load

36
Q

The number one failure in air systems is

A

Poor maintenance

37
Q

When saturated water goes to condense it

A

Decreases in temperature and volume

38
Q

What protects and keeps a piston clean?

A

A rod boot

DWR PNEUMATICS (1 decks)

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