Final Test Flashcards

1
Q

Why are pneumatic cylinder bodies built with lower structural strength material?

A

Pneumatic Cylinders operate at much lower pressure

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2
Q

What would be the reason for actual performance to deviate from estimated values?

A
  1. Air Compressibility
  2. Air Leakage from the cylinder
  3. Temperature changes causing pressure changes for the fixed chamber volume
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3
Q

How would increasing the number of vanes in a pneumatic motor impact the following parameters?
Torque
Rotational Speed
Air Leakage
Friction between vanes and housing

A

Torque - Increases
Rotational Speed - Decreases
Air Leakage - Decreases
Friction between vanes and housing - Increases

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4
Q

What is the minimum number of vanes in a pneumatic motor?

A

3

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5
Q

What is the main difference between an anvil and a rod in a pneumatic cylinder?

A

The anvil is a metal part that is not connected to but is in contact with the piston at specific points of time. The anvil will only move forward if the piston hits it.

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6
Q

List 3 conditions for selection of air intake locations in a pneumatic system

A
  1. Avoid areas with dusty air
  2. Shield intake from rain water
  3. Shield intake from sunlight
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7
Q

Classify the 3 intake-line filters in pneumatic systems

A
  1. Dry
  2. Oil Bath
  3. Oil Wetted
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8
Q

Define dew point

A

The temperature at which water becomes water droplets

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9
Q

What happens when water drops below dew point?

A

The water will become water vapour and condense itself into a solid

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10
Q

How does air temperature change along the working lines?

A

The temperature in the working lines decreases

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11
Q

What are two issues resulting in the working lines caused by temperature drops?

A
  1. Pressure Drop
  2. Water Condensation
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12
Q

How is centralized different from decentralized distribution systems?

A
  • Centralized system has one compressor station that feeds multiple work stations
  • Decentralized system has multiple compressors feeding 1 or 2 work stations
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13
Q

List the 6 factors that contribute to pressure drop in pneumatic lines

A
  • Absolute roughness
  • Hydraulic Diameter
  • Pipe Length
  • Fluid Density
  • Fluid Viscosity
  • Average Flow Velocity
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14
Q

List the factors required to size a receiver

A
  • Compressor volume flow rate
  • Min and Max compressor settings
  • Compressor idle time
  • Atmospheric Pressure
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15
Q

What is compressor idle time?

A

The time it takes for the receiver to go from max pressure to min pressure

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16
Q

List the 4 groups of distrubution systems in pneumatic systems

A
  • Fixed piping: Centered grid system
  • Fixed piping: De-centralized grid system
  • Fixed piping: Loop System
    -Flexible hosed portable compressors
17
Q

What is the main advantage of loop distrubution system?

A

It runs parallel to the reciever which reduces flow speed but reduces pressure drop which then reduces power consumption then reducing operating costs

18
Q

How would pressure drop change with increasing air viscosity?

A

Increasing air viscosity will cause a larger pressure drop

19
Q

What are two techniques used in two-stage filters?

A

A two stage filter uses centrifuged and straight filtering to work

20
Q

Which two forces are required for an automatic draincock to open?

A

Air pressure and the weight of impurities filtered out

21
Q

What does FRL stand for?

A

Filter, Pressure Regulator and Lubricator