# Compressor Fundamentals - Part A Flashcards

1
Q

What is a Barometer

A

A tube with one sealed end filled with either mercury or water. It measures weather.

2
Q

What does a Barometer measure?

A

Vacuum and Pressure

3
Q

For every 1000 feet of gain in altitude above sea level, there is a drop of one inch in the volume of mercury.
What measurement device am I?

A

Barometer

4
Q

What is a Manometer?

A

Specially shaped u-tube filled with mercury, oil or water.

5
Q

What is the most accurate measurement device for vacuum?

A

Manometer

6
Q

What measurement device is used to predict the weather?

A

Barometer

7
Q

What is a Bourbon Tube?

A

A hollow brass tube that is filled with gas. Used to measure pressure.

8
Q

What does Pascal’s Law state?

A

Pressure applied to a confined or static fluid is transmitted equally in all directions.

9
Q

Whats does Bernoulli’s Principle state?

A

If the flow rate is CONSTANT, the sum of the kenitic and the potential energy at various points in the system is CONSTANT.

10
Q

What does Bernoulli’s Principle state about pressure and velocity?

A

Velocity and Pressure are inversly proportional.

11
Q

What does Bernoulli’s Principle state about diameter of Pipes?￼

A

Decrease in diameter = increase in velocity = decrease in pressure

12
Q

Name the Gas Laws

A

Boyle’s Law
Charles’ Law
Gay-Lussac’s Law
Combined Gas Law

13
Q

State Boyle’s Law

A

If the temperature remains constant, the volume changes inversly to the pressure.

14
Q

State Charles’ Law

A

If the pressure on a given volume of gas is held constant, the volume changes in direct proportion to the absolute temperature.

15
Q

State Gay-Lussac’s Law

A

If the volume is constant, the pressure exerted by the gas is directly proportional to the absolute temperature.

16
Q

How is a compressor effected by an increase in altitude?

A

The air is thinner so less molecules are being compress and therefore the compressor is not as efficient. So an increase in intake cubic feet per minute is required to compensate.

17
Q

Name two classifications for compressors.

A

Non-Positive Displacement

Positive Displacement

18
Q

Name what classification the Rotary Compressors are and what types there are.

A

Rotary Compressors are Positive Displacement.

• Sliding Vane
• Liquid Ring
• Single Rotor
• Two Rotor
19
Q

Name what type of Compressor Classification Reciprocating Compressors are and name the types.

A

Reciprocators are Positive Displacement

• Labryinth
• Diaphragm
• Double Acting
• Single Acting
20
Q

What type of compressor is a Labyrinth Compressor? Explain them.

A
• A Positive Displacement Reciprocation Compressor.
• They run without oil and do not use piston rings. Instead a series of Labryinths mostly seal and elimnate friction to within acceptable standards.
21
Q

What type of compressor is a Diaphragm Compressor? What flow rates does it operate at?

A
• A Positive Displacement Recipricating Compressor. Includes a diaphragm that seporates the compressed air from the oiled compressor.
• Operates with low flow rates.
22
Q

Name the essential compressor components.

A
• Compressor
• Internal Combustion Engine
• Coolers
23
Q

Explain the similarities and differences between Compressors and Pumps.

A
• They are similar because they operate on the same principles. Pumps create flow while compressors move gas by raising the gas pressure.
• The difference is gas can be compressed or reduced in volume.
24
Q

What are the two types of absolute temperature scales.

A
• Kelvin for Celcius
• Rankine for Fahrenheit
25
Q

What is absolute zero for Fahrenheit?

A

-459.69 Fahrenheit = 0 Rankin

26
Q

What is the absolute zero for Celcius?

A

-273.15 Celcius = 0 Kelvin

27
Q

Name the North American and European gauge measurement scales for pressure. And equate them together.

A

14.7 psia = 101.43 kPa = 1.01 Bar
(Standard NA). (Metric NA). (Metric EU).

28
Q

How is a Vacuum created.

A

A vacuum occurs when the pressure in a container is less then the pressure surrounding it.

29
Q

What value is the perfect vacuum?

A

0 psia

30
Q

The American Society of Mechanical Engineers (ASME) uses what parameters as a common standard per cubic foot for air?

A

68F at 14.7 and 36% relative humidity

31
Q

How are centrifugal compressors designed to produce high volumes and over all increased pressure ratios?

A

More than one impeller and diffuser section

32
Q

Air delivery of a compressor is reduced by what percentage for every one thousand 1000 feet of altitude above sea level

A

3%

33
Q

Where does a Thrust Bearing go on a Screw Compressor?

A

On the compression end.

34
Q

A

A)

35
Q