Podcast
Questions and Answers
Which statement best describes the primary function of a compressor?
Which statement best describes the primary function of a compressor?
- To transfer heat between two fluids using mechanical motion.
- To reduce the volume of a gas, thereby increasing its pressure. (correct)
- To decrease the pressure of a fluid while maintaining its volume.
- To convert thermal energy into mechanical energy.
When selecting a compressor, what is the most important parameter used for its classification?
When selecting a compressor, what is the most important parameter used for its classification?
- The lubrication method used within the compressor's mechanism.
- The type of gas being compressed, such as air or refrigerant.
- The pressure ratio achieved between the inlet and outlet. (correct)
- The compressor's power source; electric, gasoline, etc.
Which type of compressor generally achieves the highest efficiency under typical operating conditions?
Which type of compressor generally achieves the highest efficiency under typical operating conditions?
- An axial flow compressor. (correct)
- A reciprocating compressor.
- A screw compressor.
- A centrifugal compressor.
Which thermodynamic process, when approximated in a compressor, requires the least amount of energy input?
Which thermodynamic process, when approximated in a compressor, requires the least amount of energy input?
What is the primary advantage of using multi-stage compression instead of single-stage compression?
What is the primary advantage of using multi-stage compression instead of single-stage compression?
How does intercooling, implemented in multi-stage compression systems, generally affect the power consumption of the compressor?
How does intercooling, implemented in multi-stage compression systems, generally affect the power consumption of the compressor?
For applications requiring extremely high pressure and relatively low flow rates, which type of compressor is generally the most suitable?
For applications requiring extremely high pressure and relatively low flow rates, which type of compressor is generally the most suitable?
In a centrifugal compressor, which component is specifically designed to convert kinetic energy of the gas into pressure?
In a centrifugal compressor, which component is specifically designed to convert kinetic energy of the gas into pressure?
Which parameter or metric is most appropriately used to assess the overall effectiveness of a compressor?
Which parameter or metric is most appropriately used to assess the overall effectiveness of a compressor?
What occurs to the volumetric efficiency of a reciprocating compressor if the clearance volume is increased while other parameters remain constant?
What occurs to the volumetric efficiency of a reciprocating compressor if the clearance volume is increased while other parameters remain constant?
Which of the following operational problems is most frequently associated with reciprocating compressors?
Which of the following operational problems is most frequently associated with reciprocating compressors?
In a centrifugal compressor, what is the most significant consequence of surge?
In a centrifugal compressor, what is the most significant consequence of surge?
What condition is most likely to cause a compressor stall in an axial compressor?
What condition is most likely to cause a compressor stall in an axial compressor?
What is the primary function of a variable inlet guide vane (VIGV) in a centrifugal compressor?
What is the primary function of a variable inlet guide vane (VIGV) in a centrifugal compressor?
In a reciprocating compressor, how does increasing the compression ratio primarily affect the discharge temperature of the gas?
In a reciprocating compressor, how does increasing the compression ratio primarily affect the discharge temperature of the gas?
Which type of lubrication system is most commonly used in screw compressors?
Which type of lubrication system is most commonly used in screw compressors?
What is the main function of a labyrinth seal in an axial compressor?
What is the main function of a labyrinth seal in an axial compressor?
What is the most critical factor in determining whether to use an axial or centrifugal compressor for a specific application?
What is the most critical factor in determining whether to use an axial or centrifugal compressor for a specific application?
In a reciprocating compressor system, what is the primary function of an unloader valve?
In a reciprocating compressor system, what is the primary function of an unloader valve?
What is a common cause of excessively high discharge temperature in a compressor?
What is a common cause of excessively high discharge temperature in a compressor?
Flashcards
Compressor Function
Compressor Function
Reduces gas volume, increasing its pressure.
Compressor Classification
Compressor Classification
Pressure ratio.
Least Energy Requirement
Least Energy Requirement
Isothermal process.
Multi-Stage Compression
Multi-Stage Compression
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Intercooling effect
Intercooling effect
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High-Pressure, Low-Flow
High-Pressure, Low-Flow
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Centrifugal Compressor Pressure Increase
Centrifugal Compressor Pressure Increase
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Compressor Efficiency
Compressor Efficiency
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Increased Clearance Volume
Increased Clearance Volume
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Reciprocating Compressor Problem
Reciprocating Compressor Problem
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Compressor Surge Consequence
Compressor Surge Consequence
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Axial Compressor Stall
Axial Compressor Stall
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VIGV Function
VIGV Function
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Compression ratio and temp
Compression ratio and temp
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Screw Compressor Lubrication
Screw Compressor Lubrication
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Labyrinth Seal Purpose
Labyrinth Seal Purpose
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Compressor choice factor
Compressor choice factor
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Unloader Valve Purpose
Unloader Valve Purpose
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High Discharge Temp Cause
High Discharge Temp Cause
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Safety Standards Organization
Safety Standards Organization
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Study Notes
- A compressor works by decreasing gas volume and increasing pressure.
- Compressors are classified primarily by pressure ratio.
- Axial flow compressors, in general, operate most efficiently.
- Isothermal thermodynamic processes require the least energy for a compressor.
- Multistage compression reduces compression work.
- Intercooling decreases power consumption in a multi-stage compressor.
- Reciprocating compressors suit high-pressure, low-flow applications.
- A diffuser increases gas pressure in a centrifugal compressor.
- All of Isothermal, Mechanical, and Volumetric efficiencies are parameters to evaluate efficiency of a compressor.
- Volumetric efficiency decreases as clearance volume increases in a reciprocating compressor.
- Liquid slugging is a common problem in reciprocating compressors.
- Compressor surge in centrifugal compressors mainly causes reverse flow and instability.
- Excessive blade loading can cause compressor stall in axial compressors.
- A VIGV (variable inlet guide vane) controls surge in a centrifugal compressor.
- A higher compression ratio results in a higher discharge temperature in reciprocating compressors.
- Screw compressors are typically use oil-flooded lubrication.
- Labyrinth seals in axial compressors prevent gas leakage between stages.
- The choice between axial and centrifugal compressors depends on the required pressure ratio and flow rate.
- An unloader valve in a reciprocating compressor reduces motor power consumption.
- Low suction pressure can cause high discharge temperature in a compressor.
- ASME (American Society of Mechanical Engineers) establishes safety standards for pressure vessels and compressor casings.
- ASME BPVC Section VIII covers the pressure vessel design of compressors.
- ISO 1217 specifies performance testing of compressors.
- NFPA 99 regulates medical gas systems in relation to medical air compressors.
- API 618 provides guidelines for safe operation of reciprocating compressors.
- OSHA regulations provide safety guidelines for workers regarding air compressors.
- Liquid slugging is commonly associated with reciprocating compressors.
- Reverse flow and instability are what compressor surge in a centrifugal compressor leads to.
- Excessive blade loading an lead to a compressor stall in an axial compressor.
- The required pressure ratio and flow rate are the primary factors influencing the choice between axial and centrifugal compressors.
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