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Exin CDCS Exam - Topic 1 Question 33 Discussion

A sprinkler system employs automatic sprinklers attached to a piping system containing water and connected to a water supply so that water discharges immediately when a head opens. What is this called?
D) Wet pipe system
A) Dry pipe system
B) Deluge system
C) Pre-action system

Exin CDCS Exam - Topic 1 Question 33 Discussion

Actual exam question for Exin's CDCS exam
Question #: 33
Topic #: 1
[All CDCS Questions]

A sprinkler system employs automatic sprinklers attached to a piping system containing water and connected to a water supply so that water discharges immediately when a head opens. What is this called?

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Suggested Answer: D

In a wet pipe system, the piping is always filled with water under pressure. When a sprinkler head is triggered by heat, water is discharged immediately. This is the most common sprinkler system for general buildings.

Dry pipe: Pipes contain air or nitrogen; water enters only after valve activation.

Deluge: Pipes are empty, and all heads open simultaneously, releasing water everywhere.

Pre-action: Pipes are dry until detection and valve activation; reduces accidental discharge risk, recommended for IT rooms.

Since the definition describes immediate discharge from water-filled pipes, this is a wet pipe system.


by Rodney at Jul 17, 2026, 01:52 AM

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Rodolfo
4 days ago
I always get confused between these options!
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Jenise
9 days ago
100% Wet pipe system, no doubt about it!
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Ammie
15 days ago
Wait, are we sure it's not a Pre-action system?
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Latrice
20 days ago
I thought it was a Deluge system, but I guess not.
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Luisa
25 days ago
That's definitely a Wet pipe system!
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Alaine
1 month ago
I’m leaning towards B, deluge system, but I remember that wet pipe systems are more common. I just can’t recall the specifics!
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Gail
1 month ago
I practiced a question like this, and I think the answer is D, wet pipe system, but I could be mixing it up with pre-action systems.
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Alease
1 month ago
I’m not entirely sure, but I remember something about deluge systems being for larger areas. Is that what this is?
upvoted 0 times
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Rebbeca
2 months ago
I think this might be a wet pipe system since it sounds like water is always in the pipes and just flows out when needed.
upvoted 0 times
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