Mechanical Engineering Exam > Mechanical Engineering Questions > Which of the following is not true?a)condensa...
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Which of the following is not true?
- a)condensation of moisture begins at the dew point.
- b)upon cooling the saturated air, the moisture seperates out and the air becomes foggy and misty.
- c)higher the relative humidity, larger will be the wet bulb depression.
- d)regardless of temperature, the values of relative humidity and degree of saturation are identical for both the saturated and dry air.
Correct answer is option 'C'. Can you explain this answer?
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Which of the following is not true?a)condensation of moisture begins a...
Explanation:
The correct answer is option 'C' - higher the relative humidity, larger will be the wet bulb depression.
Definition of Wet Bulb Depression:
The wet bulb depression is the difference between the dry bulb temperature and the wet bulb temperature in a psychrometric chart. It is a measure of how much cooling effect can be achieved through the process of evaporative cooling.
Explanation:
- Relative Humidity:
- Relative humidity is the amount of moisture present in the air compared to the maximum amount it can hold at a specific temperature. It is expressed as a percentage.
- Higher relative humidity indicates that the air is closer to its saturation point, meaning it is holding a larger amount of moisture.
- Dew Point:
- The dew point is the temperature at which the air becomes saturated and moisture begins to condense.
- When the air is cooled to or below its dew point temperature, the excess moisture in the air condenses into visible water droplets, forming dew, fog, or mist.
- Saturated Air:
- Saturated air is the air that contains the maximum amount of moisture it can hold at a specific temperature.
- When saturated air is cooled, it reaches its dew point temperature, and moisture begins to condense.
Explanation of Incorrect Statement:
The statement "higher the relative humidity, larger will be the wet bulb depression" is not true. The wet bulb depression is actually smaller at higher relative humidity values.
- Wet Bulb Depression and Relative Humidity:
- The wet bulb depression is influenced by the difference in water vapor pressure between the air and the wet bulb surface.
- Higher relative humidity means that the air is already closer to saturation and contains more moisture.
- When the air is more saturated, the difference in water vapor pressure between the air and the wet bulb surface is smaller.
- As a result, the wet bulb depression is smaller at higher relative humidity values.
- Relationship between Wet Bulb Depression and Relative Humidity:
- As the relative humidity increases, the wet bulb depression decreases.
- At 100% relative humidity, the air is already saturated, and the wet bulb depression becomes zero.
- Conversely, at lower relative humidity values, the wet bulb depression is larger because there is a greater difference in water vapor pressure between the air and the wet bulb surface.
Conclusion:
In summary, the statement "higher the relative humidity, larger will be the wet bulb depression" is not true. The correct relationship is that higher relative humidity values result in a smaller wet bulb depression.
The correct answer is option 'C' - higher the relative humidity, larger will be the wet bulb depression.
Definition of Wet Bulb Depression:
The wet bulb depression is the difference between the dry bulb temperature and the wet bulb temperature in a psychrometric chart. It is a measure of how much cooling effect can be achieved through the process of evaporative cooling.
Explanation:
- Relative Humidity:
- Relative humidity is the amount of moisture present in the air compared to the maximum amount it can hold at a specific temperature. It is expressed as a percentage.
- Higher relative humidity indicates that the air is closer to its saturation point, meaning it is holding a larger amount of moisture.
- Dew Point:
- The dew point is the temperature at which the air becomes saturated and moisture begins to condense.
- When the air is cooled to or below its dew point temperature, the excess moisture in the air condenses into visible water droplets, forming dew, fog, or mist.
- Saturated Air:
- Saturated air is the air that contains the maximum amount of moisture it can hold at a specific temperature.
- When saturated air is cooled, it reaches its dew point temperature, and moisture begins to condense.
Explanation of Incorrect Statement:
The statement "higher the relative humidity, larger will be the wet bulb depression" is not true. The wet bulb depression is actually smaller at higher relative humidity values.
- Wet Bulb Depression and Relative Humidity:
- The wet bulb depression is influenced by the difference in water vapor pressure between the air and the wet bulb surface.
- Higher relative humidity means that the air is already closer to saturation and contains more moisture.
- When the air is more saturated, the difference in water vapor pressure between the air and the wet bulb surface is smaller.
- As a result, the wet bulb depression is smaller at higher relative humidity values.
- Relationship between Wet Bulb Depression and Relative Humidity:
- As the relative humidity increases, the wet bulb depression decreases.
- At 100% relative humidity, the air is already saturated, and the wet bulb depression becomes zero.
- Conversely, at lower relative humidity values, the wet bulb depression is larger because there is a greater difference in water vapor pressure between the air and the wet bulb surface.
Conclusion:
In summary, the statement "higher the relative humidity, larger will be the wet bulb depression" is not true. The correct relationship is that higher relative humidity values result in a smaller wet bulb depression.
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Which of the following is not true?a)condensation of moisture begins at the dew point.b)upon cooling the saturated air, the moisture seperates out and the air becomes foggy and misty.c)higher the relative humidity, larger will be the wet bulb depression.d)regardless of temperature, the values of relative humidity and degree of saturation are identical for both the saturated and dry air.Correct answer is option 'C'. Can you explain this answer?
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Which of the following is not true?a)condensation of moisture begins at the dew point.b)upon cooling the saturated air, the moisture seperates out and the air becomes foggy and misty.c)higher the relative humidity, larger will be the wet bulb depression.d)regardless of temperature, the values of relative humidity and degree of saturation are identical for both the saturated and dry air.Correct answer is option 'C'. 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 Which of the following is not true?a)condensation of moisture begins at the dew point.b)upon cooling the saturated air, the moisture seperates out and the air becomes foggy and misty.c)higher the relative humidity, larger will be the wet bulb depression.d)regardless of temperature, the values of relative humidity and degree of saturation are identical for both the saturated and dry air.Correct answer is option 'C'. 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 Which of the following is not true?a)condensation of moisture begins at the dew point.b)upon cooling the saturated air, the moisture seperates out and the air becomes foggy and misty.c)higher the relative humidity, larger will be the wet bulb depression.d)regardless of temperature, the values of relative humidity and degree of saturation are identical for both the saturated and dry air.Correct answer is option 'C'. Can you explain this answer?.
Which of the following is not true?a)condensation of moisture begins at the dew point.b)upon cooling the saturated air, the moisture seperates out and the air becomes foggy and misty.c)higher the relative humidity, larger will be the wet bulb depression.d)regardless of temperature, the values of relative humidity and degree of saturation are identical for both the saturated and dry air.Correct answer is option 'C'. 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 Which of the following is not true?a)condensation of moisture begins at the dew point.b)upon cooling the saturated air, the moisture seperates out and the air becomes foggy and misty.c)higher the relative humidity, larger will be the wet bulb depression.d)regardless of temperature, the values of relative humidity and degree of saturation are identical for both the saturated and dry air.Correct answer is option 'C'. 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 Which of the following is not true?a)condensation of moisture begins at the dew point.b)upon cooling the saturated air, the moisture seperates out and the air becomes foggy and misty.c)higher the relative humidity, larger will be the wet bulb depression.d)regardless of temperature, the values of relative humidity and degree of saturation are identical for both the saturated and dry air.Correct answer is option 'C'. Can you explain this answer?.
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