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Millwright 2nd Year > Compressors > Flashcards

Compressors Flashcards

0
Q

When pressure is increased in an enclosed space the temperature…

increases or decreases

A

Increases

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1
Q

What are three ways pressure can be increased

A

Heat it
reduce the volume
add more gas into a confined space

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2
Q

Bernoulli’s principal and the law of conservation of energy apply to what

A

All fluids

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3
Q

What compressor has a sealed container where pressure is created on the inside surfaces by molecules of gas striking the surface creating a force

A

Positive displacement compressor

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4
Q

How does a dynamic compressor operate

A

Using bernoulli’s principle.

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5
Q

What does an absolute scale measure

A

Temperature and pressure

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6
Q

What are the two absolute temperature scales

A

Kelvin and Rankin

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7
Q

0° Kelvin is equal to what in degrees Celsius

A

-273°C

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8
Q

0° Rankine is equal to what in degrees Fahrenheit

A

-459°F

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9
Q

What does PSIA stand for

A

Pounds per square inch absolute

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10
Q

What does KPA stand for

A

Kilopascals

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11
Q

If all molecule motion has stopped and there is no pressure what is this called

A

Absolute pressure

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12
Q

Does gauge pressure account for atmosphere pressure

Yes
No

A

No

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13
Q

What occurs when the pressure in a container or building is less than the pressure surrounding it

A

Vacuum

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14
Q

Three common devices for measuring pressure

A

Barometer
Manometer
Bourbon tube

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15
Q

What can a barometer measure

A

Vacuum and pressure

16
Q

A manometer is most accurate for measuring what

A

Vacuum

17
Q

What happens when the bourbon tube gauge pressure goes up.

A

Is the tube to straighten out

18
Q

What does Bernoulli’s principle deal with

A

It constant flow of fluid

19
Q

Combined gas law is a combination of which laws

A

Boyle, Charles and Gay-Lussic

20
Q

What happens to the atmospheric pressure if an increase in altitude Occurs

A

Atmospheric pressure decreases

21
Q

List some problems moisture has on a compressed air system

A

Causes rust
Harmful to lubricants
Forms sludge
In some cases can cause moisture to freeze

22
Q

What is a single acting compressor

A

Compression happens on one side of the piston

23
Q

What is a double-acting compressor

A

Compresses gases on both sides of the piston

24
Q

Which compressors are the most common because of the widest range of operating suction and discharge pressures

A

Reciprocating compressors

25
Q

The term single acting means what

A

Compression happens on one side of the piston

26
Q

The term double acting compressor means what

A

The piston can compress gas on both sides

27
Q

Can the labyrinth compressor run without oil

A

Yes….creating a seal between the cylinder in the piston with a series of grooves machined on the piston and cylinder wall

28
Q

An integral compressor is essentially “what” combined into one frame with one common crankshaft

A

An engine and a compressor combined

29
Q

What does the conrod connect to on a diaphragm compressor

A

Flexible membrane or a diaphragm

30
Q

Where is a gas injection compressor most common

A

Oil production

31
Q

How is gas lift slightly different than gas injection

A

Gas Passes through a series of lift valves pushing the oil out of the well

32
Q

How many compressors are used for gas gathering

A

One central compressor to pull gas from a series of locations into one central pipeline

33
Q

When doing coal seam gas evacuation what is mainly evacuated from the ground

A

Methane

34
Q

Since gas producers can buy cheaper gas in the off-season what is the most cost-effective way of gathering gas in a field

A

A gas storage in an old oil well stored underground

35
Q

How many kilometers should a boost station be from one another

A

150 to 300 km along the pipeline

36
Q

What kind of compressors are commonly used in the compressor boost station application

A

Centrifuge compressors because they perform better with large volumes

Millwright 2nd Year (10 decks)

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