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Free air is air at
- a)Atmospheric conditions at any specific location
- b)Standard atmospheric condition at 0°C
- c)20°C and 1kg/cm2 with a relative humidity of 36%
- d)1 bar pressure and 15°C temperature
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Free air is air ata)Atmospheric conditions at any specific locationb)S...
Free air delivered is a term used to compare the handling capacity of different compressors. It is volume of air when converted to 1 bar pressure and 15°C.
Most Upvoted Answer
Free air is air ata)Atmospheric conditions at any specific locationb)S...
Understanding Free Air
Free air refers to the state of air under specific standard conditions, which helps in various engineering calculations, particularly in thermodynamics and fluid mechanics.
Standard Conditions for Free Air
- The term "free air" typically implies air measured at certain standard conditions to ensure consistency in measurements and calculations.
- Option 'D' states that free air is defined as air at 1 bar pressure and 15°C temperature, which is a widely accepted standard in engineering practices.
Why Option D is Correct
- Pressure and Temperature:
- 1 bar pressure is equivalent to 100 kPa or approximately atmospheric pressure at sea level, making it a relevant reference point.
- 15°C is close to average ambient temperature, representing standard conditions for many mechanical systems.
- Relative Humidity:
- While relative humidity can influence air properties, the critical factor in defining free air is primarily focused on pressure and temperature, not humidity.
Comparison with Other Options
- Option A: Refers to atmospheric conditions at any specific location, which may vary significantly and is not standardized.
- Option B: Mentions standard atmospheric conditions at 0°C, which does not represent the commonly accepted definition of free air.
- Option C: Specifies 20°C and relative humidity of 36%, diverging from the standard definitions used in most engineering calculations.
Conclusion
Choosing option 'D' aligns with the accepted definitions in mechanical engineering, allowing for accurate calculations and consistency across various applications. Understanding these standard conditions is vital for engineers working with air properties in design and analysis.
Free air refers to the state of air under specific standard conditions, which helps in various engineering calculations, particularly in thermodynamics and fluid mechanics.
Standard Conditions for Free Air
- The term "free air" typically implies air measured at certain standard conditions to ensure consistency in measurements and calculations.
- Option 'D' states that free air is defined as air at 1 bar pressure and 15°C temperature, which is a widely accepted standard in engineering practices.
Why Option D is Correct
- Pressure and Temperature:
- 1 bar pressure is equivalent to 100 kPa or approximately atmospheric pressure at sea level, making it a relevant reference point.
- 15°C is close to average ambient temperature, representing standard conditions for many mechanical systems.
- Relative Humidity:
- While relative humidity can influence air properties, the critical factor in defining free air is primarily focused on pressure and temperature, not humidity.
Comparison with Other Options
- Option A: Refers to atmospheric conditions at any specific location, which may vary significantly and is not standardized.
- Option B: Mentions standard atmospheric conditions at 0°C, which does not represent the commonly accepted definition of free air.
- Option C: Specifies 20°C and relative humidity of 36%, diverging from the standard definitions used in most engineering calculations.
Conclusion
Choosing option 'D' aligns with the accepted definitions in mechanical engineering, allowing for accurate calculations and consistency across various applications. Understanding these standard conditions is vital for engineers working with air properties in design and analysis.
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Free air is air ata)Atmospheric conditions at any specific locationb)Standard atmospheric condition at 0°Cc)20°C and 1kg/cm2with a relative humidity of 36%d)1 bar pressure and 15°C temperatureCorrect answer is option 'D'. Can you explain this answer?
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