2026 Actual Exin CDCS Dumps, Updated Exam Questions for Guaranteed Pass

CDCS free sample questions and answers

Exin CDCS practice quiz with correct answers for search indexing.

1. Question 1

   Should aerosol cleaning solutions be used in the computer room?

   ANo, unless leak detection installed
   

   BNo, it will contaminate the room
   

   CYes, only if room smells bad
   

   DYes, if not connected to power
   

   Correct answer: B

   Aerosol sprays release particulates and residues into the environment, which can contaminate sensitive ICT equipment. Such contamination accelerates corrosion, interferes with airflow, and increases particulate levels beyond ASHRAE recommended limits.

   Proper cleaning should use HEPA-filtered vacuum systems or dry wipes, not aerosols. Even odor control aerosols are disallowed in critical rooms.

   Therefore, aerosol cleaning solutions must never be used.

   
   

2. Question 2

   What indicates the breaking capacity of a fuse or breaker?

   AMechanical strength of the casing of a fuse or breaker.
   

   BThe maximum voltage, in case of an electrical surge, that the fuse or breaker can handle without being destroyed or causing an electric damaging arc.
   

   CThe current at which the device will trip.
   

   DThe current that a fuse or breaker is able to interrupt without being destroyed or causing an electric damaging arc.
   

   Correct answer: D

   The breaking capacity of a fuse or breaker indicates the maximum current it can safely interrupt without being damaged or creating a dangerous arc. This value is crucial for ensuring that the device can handle fault conditions and prevent equipment damage or fire risks due to excessive current flow.

   Detailed Explanation:

   The breaking capacity, also known as the interrupting rating, ensures that the fuse or breaker can safely handle fault currents up to a specified limit. Exceeding this capacity could result in the device failing to interrupt the current, potentially causing hazardous conditions like electrical arcs.

   EPI Data Center Specialist Reference:

   EPI training underscores the importance of matching fuses and breakers with appropriate breaking capacities for the anticipated fault levels in data centers to ensure reliable and safe operation.

   
   

3. Question 3

   What indicates the overcurrent of a fuse or breaker?

   AThe maximum inrush current an overcurrent protection device can handle within a defined period of time
   

   BThe maximum electrical current which can flow in a particular electrical system under short-circuit conditions; it is determined by the voltage and impedance of the supply system
   

   CThe current at which the device will trip
   

   DThe current that a fuse or breaker is able to interrupt without being destroyed or causing an electrically damaging arc
   

   Correct answer: C

   ''Overcurrent'' for protective devices is the condition above the device's rated/trip value that causes operation (tripping/melting).

   A = inrush tolerance, not the definition of overcurrent.

   B = prospective short-circuit current (Ik).

   D = interrupting/breaking capacity (Icu/Ics).

   
   

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4. Question 4

   What is the effect of having a damper (in open position) construction in a raised-floor tile?

   ADampers allow for a higher supply air temperature
   

   BDampers increase the air volume by approximately 10%
   

   CDampers reduce the air volume by approximately 10%
   

   DDampers can be used when there is a high rate of temperature change in the computer room
   

   Correct answer: C

   Perforated tiles with integrated dampers are common in raised-floor data centers because they allow airflow regulation at the rack level. However, even when the damper is fully open, the mechanism inside the tile restricts airflow. This typically reduces the delivered airflow by around 10% compared to a non-dampered tile of the same type.

   Option A is incorrect because dampers do not affect supply temperature; they only throttle volume.

   Option B is wrong since dampers cannot increase volume---they only add resistance.

   Option D is partially true that dampers help with temperature balancing, but the main effect (in open position) is volume reduction.

   Thus, the technical impact of dampers in open position is a slight airflow reduction, usually quantified as ~10%.

   
   

5. Question 5

   What is a potential disadvantage of using a hypoxic-based fire suppression system as a fire extinguishing system?

   AIt can only be used in computer rooms which have sufficient air changes per hour.
   

   BThe gas containers need to be close to the hazard area.
   

   CIt can only be used in non-continuous occupied areas.
   

   DIt can only be used in computer rooms where you have sufficient positive pressure.
   

   Correct answer: C

   A hypoxic-based fire suppression system works by reducing the oxygen level in a room to below what is necessary to sustain combustion. This makes it effective in fire prevention, but it is not suitable for continuous occupancy by personnel. Low oxygen levels can cause discomfort or even health risks for people spending extended periods in the space. Therefore, these systems are typically deployed in areas where continuous human occupancy is not required, such as storage rooms or data halls with limited personnel access.

   Detailed Explanation:

   Hypoxic fire suppression systems lower oxygen levels to around 15-16%, which is safe for short periods but not sustainable for continuous occupancy without risk to health. Data center environments where staff need to spend long periods monitoring and maintaining equipment would need alternative systems, like gas-based suppression that allows for safe evacuation rather than oxygen reduction.

   EPI Data Center Specialist Reference:

   The EPI Data Center Specialist curriculum emphasizes that fire suppression systems must be chosen based on occupancy requirements. Hypoxic systems are specifically noted as unsuitable for spaces requiring continuous human presence due to the low oxygen environment they create.