Dynamic Compressors

Question 1

What is a dynamic compressor?

Answer 1

A dynamic compressor is a type of compressor that uses kinetic energy to compress gas.

Question 2

True or False: Dynamic compressors operate primarily on the principle of positive displacement.

Answer 2

False

Question 3

Fill in the blank: The primary components of a dynamic compressor include the ______ and the diffuser.

Answer 3

impeller

Question 4

What is the function of the impeller in a dynamic compressor?

Answer 4

The impeller increases the velocity of the gas.

Question 5

Multiple Choice: Which of the following is a type of dynamic compressor? A) Reciprocating B) Screw C) Centrifugal D) Gear

Answer 5

C) Centrifugal

Question 6

What type of flow does a centrifugal compressor typically produce?

Answer 6

Radial flow

Question 7

True or False: Dynamic compressors are generally more efficient than positive displacement compressors at high flow rates.

Answer 7

True

Question 8

What is the purpose of a diffuser in a dynamic compressor?

Answer 8

To convert kinetic energy into pressure energy.

Question 9

Fill in the blank: Dynamic compressors are commonly used in ______ applications.

Answer 9

high-volume

Question 10

What is the primary advantage of using a dynamic compressor over a positive displacement compressor?

Answer 10

Higher efficiency at large volumes and flow rates.

Question 11

Multiple Choice: Which of the following is NOT a characteristic of dynamic compressors? A) Continuous flow B) High pressure ratio C) Limited capacity D) Low maintenance

Answer 11

C) Limited capacity

Question 12

What is a common application for dynamic compressors?

Answer 12

Air conditioning systems and industrial processes.

Question 13

True or False: Dynamic compressors can only handle gases.

Answer 13

True

Question 14

What is the role of the casing in a dynamic compressor?

Answer 14

To contain the gas and direct the flow through the compressor.

Question 15

Fill in the blank: The ______ is the rotating component of a dynamic compressor that imparts velocity to the gas.

Answer 15

impeller

Question 16

What happens to the gas pressure as it passes through the impeller in a dynamic compressor?

Answer 16

The pressure increases due to the added velocity.

Question 17

Multiple Choice: What is the typical pressure ratio range for centrifugal compressors? A) 1:1 to 1:3 B) 1:3 to 1:5 C) 1:5 to 1:10 D) 1:10 to 1:30

Answer 17

C) 1:5 to 1:10

Question 18

What is the main disadvantage of dynamic compressors?

Answer 18

They are less effective at low flow rates.

Question 19

True or False: Dynamic compressors require a lubrication system.

Answer 19

False

Question 20

What is surge in the context of dynamic compressors?

Answer 20

A condition where the flow reverses due to instability.

Question 21

Fill in the blank: The ______ of a dynamic compressor affects its overall efficiency.

Answer 21

design

Question 22

What is the significance of the compressor’s speed in a dynamic compressor’s performance?

Answer 22

Higher speed increases the energy imparted to the gas.

Question 23

Multiple Choice: Which parameter is critical in determining the performance of a dynamic compressor? A) Temperature B) Pressure C) Flow rate D) All of the above

Answer 23

D) All of the above

Question 24

What is the typical efficiency range for centrifugal compressors?

Answer 24

70% to 90%

Question 25

True or False: Dynamic compressors can be used for both compressing and transporting gases.

Answer 25

True

Question 26

What type of dynamic compressor is commonly used for high-pressure applications?

Answer 26

Axial compressor

Question 27

Fill in the blank: In an axial compressor, the gas flows ______ to the axis of rotation.

Answer 27

parallel

Question 28

What is the advantage of an axial compressor over a centrifugal compressor?

Answer 28

Higher flow rates and better efficiency at high pressures.

Question 29

Multiple Choice: What is the typical application for axial compressors? A) Residential HVAC B) Jet engines C) Small appliances D) Handheld tools

Answer 29

B) Jet engines

Question 30

True or False: The design of dynamic compressors is less complex than that of positive displacement compressors.

Answer 30

False

Question 31

What is the purpose of a control system in a dynamic compressor?

Answer 31

To maintain the desired operating conditions and prevent surge.

Question 32

Fill in the blank: The ______ of a dynamic compressor impacts its operational stability.

Answer 32

flow characteristics

Question 33

What is the main factor affecting the selection of a dynamic compressor for a specific application?

Answer 33

The required flow rate and pressure.

Question 34

Multiple Choice: Which of the following factors can lead to compressor surge? A) Increased flow demand B) Reduced inlet pressure C) Increased temperature D) All of the above

Answer 34

D) All of the above

Question 35

True or False: Dynamic compressors require frequent maintenance compared to other types of compressors.

Answer 35

False

Question 36

What is the primary method for controlling the output of a dynamic compressor?

Answer 36

Adjusting the speed of the compressor.

Question 37

Fill in the blank: Dynamic compressors are typically used in ______ systems to ensure efficient gas flow.

Answer 37

industrial

Question 38

What role does the inlet guide vane play in a dynamic compressor?

Answer 38

It helps control the flow and improve efficiency.

Question 39

Multiple Choice: What is a common material used for the construction of dynamic compressors? A) Steel B) Plastic C) Rubber D) Wood

Answer 39

A) Steel

Question 40

True or False: The efficiency of dynamic compressors decreases as the operating speed increases.

Answer 40

False

Question 41

What is the significance of the volute in a centrifugal compressor?

Answer 41

It collects and directs the gas flow to the discharge.

Question 42

Fill in the blank: The ______ of a compressor affects its ability to handle different gas properties.

Answer 42

design