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3rd 6 Months > TPC 309 > Flashcards

TPC 309 Flashcards

1
Q

In a pneumonia system, force must be present at all times for the system to function. What is this force?

A

Compressed air

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2
Q

What is the formula for work

A

Work = force x piston travel

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3
Q

What does Charles law state

A

If the volume of a confined quantity of gas remains the same, the change in the pressure of the gas varies directly with a change in the absolute temperature of the gas

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4
Q

If the original force is applied to the large piston instead of to the small piston, the force exerted on the small piston…

A

Decreases, but it’s amount of travel increases

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5
Q

If the kinetic energy increases and the total energy remains the same, the potential energy of the air moving in a reduced flow passage is reduced. If the potential energy is reduced…

A

The pressure of the air is also reduced

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6
Q

Positive-displacement compressors that are capable of compressing air to relatively high pressures are commonly used in pneumatic power systems. What is one kind of these devices

A

Reciprocating piston

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7
Q

What opens the valves on a reciprocating compressor

A

The negative pressure allows the air at atmospheric pressure to open the valves

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8
Q

What do cooling components allow for in compressors

A

The need for less power because the cooling between stages reduces the volume of air that is compressed in the second stage

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9
Q

What are the two functions of compressor lubricating oil

A

Reduce friction and improve the transfer of heat in the compressor

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10
Q

What does unloading allow for in large compressors

A

It does not compress air and is easier to start

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11
Q

Single stage vane compressors are capable of developing up to what psi discharge pressure

A

50 psi

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12
Q

What speeds do screw compressors operate at

A

Between 3000 and 12000 rpm

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13
Q

Impeller compressors also known as blowers are designed to…

A

Move high volume and low pressure air

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14
Q

What compressors require more horsepower per cfm

A

Centrifugal compressors

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15
Q

When trying to control the centrifugal compressor output what is the most effective way

A

Speed variation, however many compressors lose efficiency when the speed is reduced too much

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16
Q

What can change the amount of water content in pressurized air

A

Humidity and temperature

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17
Q

Water cooling is economical for what type of compressors

A

Medium-sized single stage compressors operating more than 8 hours a day and for larger compressors or any that operate more than 10 hours a day

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18
Q

What do air receivers allow for

A

The capability to balance off available compressor capacity against much larger peak air-flow demands that occur

19
Q

Centrifugal separators also known as inertial separators work in what way

A

The inertia of a heavy moving particle to aid in the separation, the heavier a particle is and the faster it is moving, the more it tends to travel in a straight line, therefore when it is force into a circular path it has a natural tendency to move outward

20
Q

If it stops 100% of a given particle size, this size is referred to as…

A

Absolute rating

21
Q

Wetted air filters have a slightly higher initial cost than dry filters but…

A

They can be cleaned many times

22
Q

Fine lubricators are especially effective in what systems

A

Complicated piping systems and intermittent equipment operation

23
Q

To avoid turbulence in inner walls of an air piping system what should you do

A

The inner walls should be smooth and piping should not change direction more than necessary, also the number of fittings should be kept to a minimum

24
Q

The slope when installing air lines should be what

A

1in for every 10ft as well as in a downward direction in the direction of air flow

25
Q

What pipe thread is used for pneumatic piping

A

NPT, ( national pipe thread )

26
Q

What can the number of primary system connecting ports be?

A

Two, three, four, and five

27
Q

What valve is a two way valve and is excellent for high pressure service

A

A needle valve

28
Q

What are the benefits of a spool valve

A

It is easy to operate even with high pressures because the internal forces balance each other

29
Q

What are 4 way valves used for

A

To simplify pneumatic circuits

30
Q

What is a five way valve

A

It is a special four way valve with five external connections

31
Q

The poppet is held against the valve seat how

A

By the force of the adjustable poppet spring

32
Q

What is cracking pressure

A

The pressure at which the valve initially opens, is determined by the adjustment of the spring

33
Q

A diaphragm relief valve responding to increasing air pressure opens much faster than what

A

A poppet valve

34
Q

When does a regulator valve close

A

When the discharge pressure increases

35
Q

A diaphragm valve will control difference in psi how

A

By modulating continuously to maintain desired pressure

36
Q

It is difficult to adjust a separate pressure-relief valve to operate at pressures just above regulator pressure settings , what is used

A

A built in relief valve is desirable for this application

37
Q

Thrust is greater when the piston is moved to the left than when it is moved to the right most standard pneumatic cylinders are

A

Double acting

38
Q

What is a spring return cylinder

A

A modified single acting cylinder is equipped with an internal sprint

39
Q

Many single and double acting cylinders are equipped with and exhaust flow control metering valve , what does this do

A

This valve restricts the amount of exhaust air that can pass from the cylinder through the valve and governs the speed at which the cylinder can retract

40
Q

Pivoted cylinder mountings are classed as being…

A

Trunnion or Clevis and have no rigid support

41
Q

What is used to check if a control valve is capable of handling the air of a cylinder

A

The capacity coefficient

42
Q

What is stalling torque

A

The force necessary to stop the motor once it is running

43
Q

The maximum power output is obtained how

A

At the medium speed and medium torque output

44
Q

How does a axial position motor work

A

Compressed air entering the inlet port acts on the piston against a wobble/cam plate attached to the offset shaft causes the cam plate to rotate this motion is transferred through gears to the output shaft

3rd 6 Months (5 decks)

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