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If moist air is sensibly cooled above its dew point which of the following statements are correct:
1. Relative humidity decreases
2. Wet bulb temperature decreases
3. Wet bulb temperature increases
4. Humidity ratio remains constant
Q. Select the correct answer using the codes given below:
  • a)
    1 and 2
  • b)
    1 and 3
  • c)
    3 and 4
  • d)
    2 and 4
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
If moist air is sensibly cooled above its dew point which of the follo...

When moist air is sensibly cooled
1. Its relative humidity increases
2. Its wet bulb temperature decreases
3. Its enthalpy decreases
4. Its humidity ratio remains constant
View all questions of this test
Most Upvoted Answer
If moist air is sensibly cooled above its dew point which of the follo...
Explanation:

When moist air is sensibly cooled above its dew point, the following changes occur:

1. Relative humidity decreases: As the air is cooled, its capacity to hold moisture decreases. Hence, the amount of moisture in the air remains constant but the maximum amount of moisture that the air can hold decreases. Therefore, the relative humidity (the amount of moisture in the air compared to the maximum amount it can hold at that temperature) decreases.

2. Wet bulb temperature decreases: The wet bulb temperature is the lowest temperature that can be achieved by evaporating water into the air. When the air is cooled, the wet bulb temperature decreases as the air's capacity to hold moisture decreases.

3. Wet bulb temperature increases: This statement is incorrect. As explained above, the wet bulb temperature decreases when the air is cooled.

4. Humidity ratio remains constant: The humidity ratio is the mass of moisture in the air per unit mass of dry air. When the air is cooled, the amount of moisture in the air remains constant but the mass of dry air decreases. Therefore, the humidity ratio remains constant.

Hence, the correct statements are:

- Relative humidity decreases
- Wet bulb temperature decreases
- Humidity ratio remains constant

Therefore, option 'D' is the correct answer.
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If moist air is sensibly cooled above its dew point which of the following statements are correct:1. Relative humidity decreases2. Wet bulb temperature decreases3. Wet bulb temperature increases4. Humidity ratio remains constantQ.Select the correct answer using the codes given below:a)1 and 2b)1 and 3c)3 and 4d)2 and 4Correct answer is option 'D'. Can you explain this answer?
Question Description
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