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3rd 6 Months > TPC 309 > Flashcards

TPC 309 Flashcards

1
Q

In a pneumatic 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 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 3,000 and 12,000 RPM

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13
Q

Impeller compressor also knows 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

What 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 internal 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 forced 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 filers but…

A

They can be cleaned many times.

22
Q

Fire lubricators are especially effective in what systems?

A

Complicated piping systems and intermittent equipment operation.

23
Q

To avoid turbulence in inner walls for 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

1 inch for every 10 feet 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 equip with an internal spring.

39
Q

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

A

The 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’s running.

43
Q

The maximum power output is obtained how?

A

At the medium speed and medium torque output.

44
Q

How does an axial piston motor work?

A

Compressed air entering the inlet ports acts on the piston against a wobble/cam plate attached to the offset shaft causing the cam plate to rotate this motion transferring through gears to the output shaft.

3rd 6 Months (13 decks)

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