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Exin CDCS Exam - Topic 3 Question 14 Discussion

Actual exam question for Exin's CDCS exam
Question #: 14
Topic #: 3
[All CDCS Questions]

When are the wet bulb and dry bulb temperatures identical?

Show Suggested Answer Hide Answer
Suggested Answer: D

The wet bulb and dry bulb temperatures become identical when the relative humidity reaches 100%. At this point, the air is fully saturated with moisture, meaning it can no longer absorb additional water vapor. As a result, the rate of evaporation decreases, and there is no difference between the dry bulb and wet bulb temperatures.

Detailed Explanation:

The dry bulb temperature measures the air temperature, while the wet bulb temperature takes into account the cooling effect of evaporation. When relative humidity is at 100%, the air has reached its saturation point, and no further evaporation occurs. This causes both the wet bulb and dry bulb thermometers to display the same temperature reading. This condition is critical in understanding environmental conditions, particularly in HVAC and data center environments, where humidity control is essential to avoid equipment overheating or corrosion.

EPI Data Center Specialist References:

The EPI Data Center Specialist training includes understanding humidity levels and their impact on data center environments. Knowing when wet bulb and dry bulb temperatures align helps data center operators manage moisture levels effectively, which is essential for preventing issues related to high humidity, such as condensation on IT equipment.


by Maryrose at Apr 07, 2025, 09:08 PM

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Shayne
3 months ago
100% RH makes sense, but it feels weird!
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Mary
3 months ago
Nah, I think it's more complicated than that.
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Rana
3 months ago
Totally agree, that's basic stuff!
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Augustine
3 months ago
Wait, are you sure? I thought it was about the dry bulb temp limits.
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Hermila
4 months ago
It's when the relative humidity is 100%.
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Jesusita
4 months ago
I believe the answer is D, but I also remember something about how the dry bulb temperature relates to equipment limits. It's tricky!
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Na
4 months ago
I’m a bit confused about the ASHRAE guidelines. I thought the temperatures might align at a specific humidity level, but I can't recall the exact details.
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Shanda
4 months ago
I remember practicing a question like this, and I feel like it had to do with humidity levels. Could it be option D?
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Tamra
4 months ago
I think the wet bulb and dry bulb temperatures are the same when the relative humidity is 100%, but I'm not completely sure.
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Yolando
5 months ago
I've got this! The wet and dry bulb temps are the same when the relative humidity is 50%, which is the best practice value. That's the key to this question.
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Toi
5 months ago
Wait, I'm a bit confused. Is it when the dry bulb temp is at the ASHRAE limits? Or is it something to do with the relative humidity? I'll have to review my notes on this.
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Stevie
5 months ago
Okay, I remember learning about this in class. I'm pretty sure the wet and dry bulb temps are identical when the relative humidity is 100%.
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Sommer
5 months ago
Hmm, this seems like a tricky one. I'll need to think through the relationship between wet bulb and dry bulb temperatures to figure this out.
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Lorriane
10 months ago
Definitely D. When it's a sauna in there, that's when the wet and dry bulb temps are the same. Time to break out the towels and sunscreen!
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Omega
9 months ago
C) When the relative humidity is at the best practice value for relative humidity, being 50% RH
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Tayna
9 months ago
B) When the dry bulb's temperature is at the highest allowable temperature for IT equipment as per ASHRAE
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Vincent
9 months ago
A) When the dry bulb's temperature is at the lowest allowable temperature for IT equipment as per ASHRAE
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Margurite
10 months ago
I'm going with D. When it's 100% RH, the wet and dry bulb temps are identical. Anything less than that and they start to diverge. No brainer!
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Carmelina
9 months ago
User 3: Agreed, D it is. 100% RH is the key.
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Zena
9 months ago
User 2: Yeah, that makes sense. So D is the correct answer.
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Ahmad
9 months ago
User 1: I think it's D too. 100% RH means same temps for wet and dry bulb.
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Suzan
10 months ago
Gotta be D, when the relative humidity is 100%. That's when the air is completely saturated and the temps are equal. Easy peasy!
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Yuette
9 months ago
I'm going with C, when the relative humidity is at the best practice value for relative humidity, being 50% RH.
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Lynsey
9 months ago
No way, it's definitely D, when the relative humidity is 100% and the wet bulb and dry bulb temperatures are identical.
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Rex
9 months ago
I think it's A, when the dry bulb's temperature is at the lowest allowable temperature for IT equipment as per ASHRAE.
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Lilli
10 months ago
I'm not sure, but I think it makes sense that when the relative humidity is at the optimal level, the wet and dry bulb temperatures would match.
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Jordan
11 months ago
I agree with Shannan, because at 50% RH, the wet bulb and dry bulb temperatures are usually identical.
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Reita
11 months ago
Hmm, when the relative humidity is 100%, that's when the wet and dry bulb temps are the same, right? Sounds like a trick question to me!
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Carolann
9 months ago
D) When the relative humidity is 100%
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Glory
9 months ago
C) When the relative humidity is at the best practice value for relative humidity, being 50% RH
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Lindsey
9 months ago
B) When the dry bulb's temperature is at the highest allowable temperature for IT equipment as per ASHRAE
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Mabel
9 months ago
A) When the dry bulb's temperature is at the lowest allowable temperature for IT equipment as per ASHRAE
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Gladys
9 months ago
D) When the relative humidity is 100%
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Darnell
9 months ago
C) When the relative humidity is at the best practice value for relative humidity, being 50% RH
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Theola
9 months ago
B) When the dry bulb's temperature is at the highest allowable temperature for IT equipment as per ASHRAE
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Cecilia
10 months ago
A) When the dry bulb's temperature is at the lowest allowable temperature for IT equipment as per ASHRAE
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Shannan
11 months ago
I think the answer is C) When the relative humidity is at the best practice value for relative humidity, being 50% RH.
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