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For air at a given temperature, as the relative humidity is increased isothermally,
- a)the wet bulb temperature and specific enthalpy increase
- b)the wet bulb temperature and specific enthalpy decrease
- c)the wet bulb temperature increases and specific enthalpy decreases
- d)the wet bulb temperature decreases and specific enthalpy increases
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
For air at a given temperature, as the relative humidity is increased ...
Relative humidity is increased isothermally.
Most Upvoted Answer
For air at a given temperature, as the relative humidity is increased ...
Answer:
To understand why the correct answer is option 'A', let's break down the relationship between relative humidity, wet bulb temperature, and specific enthalpy.
Relative Humidity:
Relative humidity is a measure of the amount of moisture in the air compared to the maximum amount it can hold at a given temperature. It is expressed as a percentage. As the relative humidity increases, the air becomes more saturated with moisture.
Wet Bulb Temperature:
The wet bulb temperature is the temperature recorded by a thermometer that has its bulb covered with a wet cloth and exposed to moving air. It is a measure of the cooling effect due to evaporation. When the air is dry, the wet bulb temperature is lower than the dry bulb temperature. As the air becomes more saturated with moisture, the wet bulb temperature approaches the dry bulb temperature.
Specific Enthalpy:
Specific enthalpy is a measure of the total energy contained in a unit mass of air. It takes into account the internal energy of the air, as well as the energy associated with its pressure and volume. It is usually expressed in units of energy per unit mass (e.g., kJ/kg).
Relationship between Relative Humidity, Wet Bulb Temperature, and Specific Enthalpy:
1. As the relative humidity increases, the air becomes more saturated with moisture. This means that the air is already holding a significant amount of moisture.
2. When the air is holding more moisture, the cooling effect due to evaporation (wet bulb temperature) becomes less pronounced because there is less room for additional evaporation.
3. Therefore, as the relative humidity increases, the wet bulb temperature increases because less cooling is taking place.
4. The specific enthalpy of the air is directly related to its temperature. As the wet bulb temperature increases, so does the specific enthalpy.
Conclusion:
Based on the above explanation, we can conclude that as the relative humidity is increased isothermally, both the wet bulb temperature and specific enthalpy of the air increase. Therefore, the correct answer is option 'A'.
To understand why the correct answer is option 'A', let's break down the relationship between relative humidity, wet bulb temperature, and specific enthalpy.
Relative Humidity:
Relative humidity is a measure of the amount of moisture in the air compared to the maximum amount it can hold at a given temperature. It is expressed as a percentage. As the relative humidity increases, the air becomes more saturated with moisture.
Wet Bulb Temperature:
The wet bulb temperature is the temperature recorded by a thermometer that has its bulb covered with a wet cloth and exposed to moving air. It is a measure of the cooling effect due to evaporation. When the air is dry, the wet bulb temperature is lower than the dry bulb temperature. As the air becomes more saturated with moisture, the wet bulb temperature approaches the dry bulb temperature.
Specific Enthalpy:
Specific enthalpy is a measure of the total energy contained in a unit mass of air. It takes into account the internal energy of the air, as well as the energy associated with its pressure and volume. It is usually expressed in units of energy per unit mass (e.g., kJ/kg).
Relationship between Relative Humidity, Wet Bulb Temperature, and Specific Enthalpy:
1. As the relative humidity increases, the air becomes more saturated with moisture. This means that the air is already holding a significant amount of moisture.
2. When the air is holding more moisture, the cooling effect due to evaporation (wet bulb temperature) becomes less pronounced because there is less room for additional evaporation.
3. Therefore, as the relative humidity increases, the wet bulb temperature increases because less cooling is taking place.
4. The specific enthalpy of the air is directly related to its temperature. As the wet bulb temperature increases, so does the specific enthalpy.
Conclusion:
Based on the above explanation, we can conclude that as the relative humidity is increased isothermally, both the wet bulb temperature and specific enthalpy of the air increase. Therefore, the correct answer is option 'A'.
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Community Answer
For air at a given temperature, as the relative humidity is increased ...
Tdb remains constant but relative humidity has increases. Now if we draw the constant Twb lines from both state 1 and state 2. We will find that Twb increases and W also increases. That's why answer is A.
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For air at a given temperature, as the relative humidity is increased isothermally,a)the wet bulb temperature and specific enthalpy increaseb)the wet bulb temperature and specific enthalpy decreasec)the wet bulb temperature increases and specific enthalpy decreasesd)the wet bulb temperature decreases and specific enthalpy increasesCorrect answer is option 'A'. Can you explain this answer?
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For air at a given temperature, as the relative humidity is increased isothermally,a)the wet bulb temperature and specific enthalpy increaseb)the wet bulb temperature and specific enthalpy decreasec)the wet bulb temperature increases and specific enthalpy decreasesd)the wet bulb temperature decreases and specific enthalpy increasesCorrect answer is option 'A'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about For air at a given temperature, as the relative humidity is increased isothermally,a)the wet bulb temperature and specific enthalpy increaseb)the wet bulb temperature and specific enthalpy decreasec)the wet bulb temperature increases and specific enthalpy decreasesd)the wet bulb temperature decreases and specific enthalpy increasesCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For air at a given temperature, as the relative humidity is increased isothermally,a)the wet bulb temperature and specific enthalpy increaseb)the wet bulb temperature and specific enthalpy decreasec)the wet bulb temperature increases and specific enthalpy decreasesd)the wet bulb temperature decreases and specific enthalpy increasesCorrect answer is option 'A'. Can you explain this answer?.
For air at a given temperature, as the relative humidity is increased isothermally,a)the wet bulb temperature and specific enthalpy increaseb)the wet bulb temperature and specific enthalpy decreasec)the wet bulb temperature increases and specific enthalpy decreasesd)the wet bulb temperature decreases and specific enthalpy increasesCorrect answer is option 'A'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about For air at a given temperature, as the relative humidity is increased isothermally,a)the wet bulb temperature and specific enthalpy increaseb)the wet bulb temperature and specific enthalpy decreasec)the wet bulb temperature increases and specific enthalpy decreasesd)the wet bulb temperature decreases and specific enthalpy increasesCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For air at a given temperature, as the relative humidity is increased isothermally,a)the wet bulb temperature and specific enthalpy increaseb)the wet bulb temperature and specific enthalpy decreasec)the wet bulb temperature increases and specific enthalpy decreasesd)the wet bulb temperature decreases and specific enthalpy increasesCorrect answer is option 'A'. Can you explain this answer?.
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