Dynamic Compressors Flashcards
What is a dynamic compressor?
A dynamic compressor is a type of compressor that uses kinetic energy to compress gas.
True or False: Dynamic compressors operate primarily on the principle of positive displacement.
False
Fill in the blank: The primary components of a dynamic compressor include the ______ and the diffuser.
impeller
What is the function of the impeller in a dynamic compressor?
The impeller increases the velocity of the gas.
Multiple Choice: Which of the following is a type of dynamic compressor? A) Reciprocating B) Screw C) Centrifugal D) Gear
C) Centrifugal
What type of flow does a centrifugal compressor typically produce?
Radial flow
True or False: Dynamic compressors are generally more efficient than positive displacement compressors at high flow rates.
True
What is the purpose of a diffuser in a dynamic compressor?
To convert kinetic energy into pressure energy.
Fill in the blank: Dynamic compressors are commonly used in ______ applications.
high-volume
What is the primary advantage of using a dynamic compressor over a positive displacement compressor?
Higher efficiency at large volumes and flow rates.
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
C) Limited capacity
What is a common application for dynamic compressors?
Air conditioning systems and industrial processes.
True or False: Dynamic compressors can only handle gases.
True
What is the role of the casing in a dynamic compressor?
To contain the gas and direct the flow through the compressor.
Fill in the blank: The ______ is the rotating component of a dynamic compressor that imparts velocity to the gas.
impeller
What happens to the gas pressure as it passes through the impeller in a dynamic compressor?
The pressure increases due to the added velocity.
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
C) 1:5 to 1:10
What is the main disadvantage of dynamic compressors?
They are less effective at low flow rates.
True or False: Dynamic compressors require a lubrication system.
False
What is surge in the context of dynamic compressors?
A condition where the flow reverses due to instability.
Fill in the blank: The ______ of a dynamic compressor affects its overall efficiency.
design
What is the significance of the compressor’s speed in a dynamic compressor’s performance?
Higher speed increases the energy imparted to the gas.
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
D) All of the above
What is the typical efficiency range for centrifugal compressors?
70% to 90%
True or False: Dynamic compressors can be used for both compressing and transporting gases.
True
What type of dynamic compressor is commonly used for high-pressure applications?
Axial compressor
Fill in the blank: In an axial compressor, the gas flows ______ to the axis of rotation.
parallel
What is the advantage of an axial compressor over a centrifugal compressor?
Higher flow rates and better efficiency at high pressures.
Multiple Choice: What is the typical application for axial compressors? A) Residential HVAC B) Jet engines C) Small appliances D) Handheld tools
B) Jet engines
True or False: The design of dynamic compressors is less complex than that of positive displacement compressors.
False
What is the purpose of a control system in a dynamic compressor?
To maintain the desired operating conditions and prevent surge.
Fill in the blank: The ______ of a dynamic compressor impacts its operational stability.
flow characteristics
What is the main factor affecting the selection of a dynamic compressor for a specific application?
The required flow rate and pressure.
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
D) All of the above
True or False: Dynamic compressors require frequent maintenance compared to other types of compressors.
False
What is the primary method for controlling the output of a dynamic compressor?
Adjusting the speed of the compressor.
Fill in the blank: Dynamic compressors are typically used in ______ systems to ensure efficient gas flow.
industrial
What role does the inlet guide vane play in a dynamic compressor?
It helps control the flow and improve efficiency.
Multiple Choice: What is a common material used for the construction of dynamic compressors? A) Steel B) Plastic C) Rubber D) Wood
A) Steel
True or False: The efficiency of dynamic compressors decreases as the operating speed increases.
False
What is the significance of the volute in a centrifugal compressor?
It collects and directs the gas flow to the discharge.
Fill in the blank: The ______ of a compressor affects its ability to handle different gas properties.
design
