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Exam CISA topic 1 question 112 discussion

Actual exam question from Isaca's CISA
Question #: 112
Topic #: 1
[All CISA Questions]

Which of the following fire suppression systems needs to be combined with an automatic switch to shut down the electricity supply in the event of activation?

  • A. FM-200
  • B. Dry pipe
  • C. Carbon dioxide
  • D. Halon
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Suggested Answer: B 🗳️

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Greens
2 weeks, 2 days ago
Selected Answer: C
Carbon dioxide (CO₂) fire suppression systems are effective at extinguishing fires by displacing oxygen, but CO₂ is dangerous to humans because it can cause suffocation in enclosed spaces. Therefore, to ensure safety, a CO₂ system must be combined with an automatic switch to shut down electrical power when the system activates. This prevents electrical hazards and reduces risks to personnel. Why not the others? A. FM-200 ➤ A clean agent that is safe for occupied spaces; no mandatory power shutdown required. B. Dry pipe ➤ A sprinkler system that uses water; shutting down power is not a typical requirement. D. Halon ➤ Also a clean agent (though now largely phased out); typically no mandatory power shutdown is required.
upvoted 1 times
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Alingan
6 months, 2 weeks ago
Selected Answer: B
Dry pipe uses water and requires shutdown of electricity
upvoted 3 times
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NoKev
10 months, 2 weeks ago
Selected Answer: B
Water + electricity power = danger
upvoted 3 times
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a84n
1 year, 2 months ago
Selected Answer: C
Answer: C
upvoted 2 times
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mdh717
1 year, 2 months ago
Carbon dioxide (CO2) fire suppression systems are designed to extinguish fires by reducing the level of oxygen that supports combustion. However, CO2 systems pose a significant risk to human life because they can lead to suffocation if individuals are present in the area when the system discharges. Due to this risk, CO2 systems are often used in unoccupied spaces or are designed to allow for evacuation before discharge. In addition to the risk to humans, the use of CO2 as a fire suppression agent does not remove the electrical energy that may have caused the fire, potentially allowing the fire to reignite once the CO2 has dissipated. Therefore, it's important that these systems be combined with an automatic switch to shut down the electricity supply in the event of activation. This helps ensure that the electrical source of the fire is also cut off, preventing re-ignition.
upvoted 2 times
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Tef_corp
1 year, 2 months ago
Selected Answer: C
Carbon dioxide (CO2): This gas displaces oxygen to extinguish fires. It displaces oxygen so rapidly that it can cause suffocation in occupied spaces. To prevent this risk during accidental discharge, an automatic power shutoff is crucial.
upvoted 2 times
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Swallows
1 year, 2 months ago
Selected Answer: B
When the sprinkler head is activated by heat from a fire, the air in the pipe is discharged from the head, causing the pressure in the pipe to drop and water to be discharged from the sprinkler head.
upvoted 1 times
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fori12
1 year, 3 months ago
B is the right one , water is conductor of electricity , there is a risk electrochoc ,
upvoted 1 times
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mountainku
1 year, 11 months ago
건식파이프는 자동스위치와 장비보호를 위해 연결이 팔요함
upvoted 2 times
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Changwha
1 year, 11 months ago
C. Carbon dioxide
upvoted 3 times
kGiGa
1 year, 10 months ago
Why shoud the electricity shut down to use the Carbon dioxide?
upvoted 2 times
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kGiGa
1 year, 10 months ago
"Carbon dioxide systems - Due to the threat to human life, it is illegal for these systems to be set to automatic release if any human may be in the area."
upvoted 1 times
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A (35%)
C (25%)
B (20%)
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