Question

Psychometric chart can be used to find out
(A). Dew point temperature
(B). Triple point
(C). Humid volume
(D). Humidity

Choose the correct answer from the options given below:

• A. (A), (B) and (D) only.
• B. (A) and (C) only.
• C. (A), (C) and (D) only.
• D. (A) and (D) only.

Hint:

Humid volume, dry-bulb, wet-bulb, dew-point, relative humidity, and specific humidity are all moisture-air thermal properties found directly on a psychrometric chart.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
A psychrometric chart graphically represents the thermodynamic state of moist air (air-water vapor mixtures) at a constant total atmospheric pressure.

Step 3: Detailed Explanation:
A standard psychrometric chart displays lines corresponding to the following properties:
- Dry-bulb temperature
- Wet-bulb temperature
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Dew point temperature (A): Located by moving horizontally to the 100% saturation curve.
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Humid volume (C): Represented by steep, constant-volume diagonal lines.
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Humidity (D): Represented on the vertical axis as specific humidity (humidity ratio) or curves for relative humidity.
-

Triple point (B): A unique phase boundary state of a substance, which is shown on a pressure-temperature phase diagram, not on a psychrometric chart.
Thus, the chart can determine (A), (C), and (D).

Step 4: Final Answer:
The correct option is 3, which corresponds to (A), (C) and (D) only.