Question

The difference between dry bulb temperature and wet bulb temperature is called:

• A. dry bulb depression
• B. wet bulb depression
• C. dew point depression
• D. degree of saturation

Hint:

DBT - WBT always gives wet bulb depression—commonly asked concept.

Answer 1

The Correct Option is B

Concept: In psychrometry:
• Dry bulb temperature (DBT) = actual air temperature
• Wet bulb temperature (WBT) = temperature measured with wet wick

Step 1: Define the difference.
\[ \text{DBT} - \text{WBT} \]

Step 2: Name of this difference.
This difference is called: \[ \text{Wet bulb depression} \]

Step 3: Physical meaning.
It indicates the moisture content of air:
• Larger difference → drier air
• Smaller difference → humid air Final Answer: \[ \boxed{\text{Wet bulb depression}} \]