[Jul-2025] Verified CDCS dumps Q&As – CDCS dumps with Correct Answers [Q22-Q45]

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[Jul-2025] Verified CDCS dumps Q&As – CDCS dumps with Correct Answers

The Best EPI Data Centre Study Guide for the CDCS Exam

NO.22 You are working on the design of a new facility. The electrical riser of the building with high current power is located close to the area where sensitive IT equipment in the computer room will be located.
What should you recommend to reduce the amount of EMF coming from the electrical riser?

Install single-phase power cabling

Install three-phase power cabling based on three individual core wires

Install bus bar trunking

Install three-phase power cabling based on a combined cable (e.g. XLPE etc.)

NO.23 The temperature in the computer room is being increased from 18°C/64°F to 27°C/81°F.
What is the impact, if any, on the amount of gas required to suppress a fire assuming the gas is a Halocarbon?

The amount of gas required will be higher

The amount of gas required will not change

The amount of gas required will be lower

The change to the amount of gas cannot be determined without knowing the change in humidity as well

NO.24 Which formula is correct?

Phase-to-Neutral Voltage = Phase-to-Phase voltage * 1.732

Phase-to-Neutral Voltage = Phase-to-Phase voltage /1.732

Phase-to-Neutral Voltage = Phase-to-Neutral voltage * 1.732

Phase-to-Neutral Voltage = (Phase-to-Phase voltage * 1.732) / Phase-to-Neutral Voltage

NO.25 A data center is located in an area where the demand for power is higher than the utility power company is able to deliver. This results in frequent power outages and, therefore, power shedding (scheduled/controlled power shutdown for areas) is frequently applied. The mains power is more than 650 hours/year not available.
What type of generators should be installed?

Standby generators should be installed in at least an N+1 configuration

Continuous generators should be installed, at least in an N+1 configuration

A combination of standby-, prime-, and continuous-generators, as the duration of the power outage is unpredictable. The total available capacity of the generators should be at least 500% of the data center load

Continuous generators should be installed; no N+1 configuration is needed as the generators will run all the time

NO.26 What is a significant difference between a halocarbon gas-based fire suppression system and an inert gas-based fire suppression system?

Inert gas has smaller-sized gas containers than halocarbon gas.

Inert gas harms the environment and halocarbon gas does not.

Halocarbon gas works on the basis of heat removal and inert gas works on the basis of oxygen reduction.

Halocarbon gas works on the basis of oxygen reduction and inert gas works on the basis of heat removal.

NO.27 The UPS of a data center, with an ANSI/TIA-942 Rating-4, is installed with the rectifier connected to power feed A and the bypass/reserve line input connected to power feed B.
To which feed will the output of the UPS be synchronized?

The UPS will not synchronize to any of the feeds but use an internal clock to set the output voltage and frequency

Depends on the setting of the UPS, as the UPS can normally be set to either feed

Feed A

Feed B

NO.28 The humidity in the computer room has changed from about 50% down to 35% Relative Humidity (RH).
What influence does this have on Electrostatic Discharge (ESD)?

No influence as long as the temperature is at approximately 20°C/77°F

Relative humidity has no influence on ESD

ESD levels will go up

ESD levels will go down

NO.29 Management has requested a 15-minute battery bank assuming full load on the UPS. The UPS vendor has provided the following specifications of the UPS:
* Rated power: 30 kVA
* Rectifier input voltage: 400 V/3 phase
* Rectifier input power factor: 0.8
* Battery rated voltage: 384 V
* Number of cells: 192
* End of discharge voltage: 308 V
* Inverter output voltage: 400 V/3 phase
* Inverter output power factor: 0.8
What information is missing to perform the battery calculation?

UPS efficiency

Inverter efficiency

Load imbalance on the phases

Available battery charging current

NO.30 What is the main disadvantage of using a ToR (Top of Rack) design?

A single ToR (Top of Rack) switch is more expensive than an EoR (End of Row) switch.

You need a separate rack to install all your ToR (Top of Rack) switches.

There will be more switches to manage.

A ToR (Top of Rack) switch has only optical interfaces.

NO.31 The noise levels in the data center are approximately 91 dB (A).
Do employers need to take precautions?

No, anything less than 100 dB (A) is acceptable.

There are no regulations regarding noise levels inside a building. Regulations only apply to noise pollution outside of the building.

As long as the data is compliant to ISO/IEC 27001 it is acceptable.

Yes, since it is mandated by regulations.

NO.32 Do you need to consider bullet (ballistics) protection when designing a data center?

Bullet (ballistics) protection is required by ANSI/TIA-942 for all data centers.

Bullet (ballistics) protection is only required when the data center is located in an area with a high crime rate.

Bullet (ballistics) protection is required by ANSI/TIA-942 for data centers Rated 3/4.

Bullet (ballistics) protection is only required if the facility is a potential target or the building is in the vicinity of a potential target.

NO.33 A new network storage device in a non-standard size rack of approximately 600 kg/1,300 lbs is going to be installed in the data center.
Are new floor loading calculations required?

No, as long as the equipment is less than 700 kg/1,500 lbs it will be within the limits.

No, specifications of equipment brought into the data center will already be known during the design of the data center, and therefore the floor will be able to handle it.

Yes, additional floor loading calculations need to be done by the floor manager, which should be verified by the safety engineer.

Yes, a structural engineer, approved/endorsed by the building owner, should carry out new floor loading calculations.

NO.34 You are allowed to use a calculator for this question. A battery bank is rated at a total capacity of 600 Ah. Calculate how much charging current the rectifier should be able to supply as charging current.

12 Amperes

30 Amperes

60 Amperes

80 Amperes

NO.35 When shielding material reaches its saturation point, what will be the impact?

The shielding material will reach its optimal shielding performance state.

The shielding material will no longer be able to attenuate (reduce) additional EMF.

The shielding material will increase its permeability factor.

The shielding material will reach its maximum electrically charged state.

NO.36 You are installing new copper cabling.
What is the advantage or disadvantage of choosing pre-terminated category 6 or 6A cabling?

Pre-terminated cabling is already factory tested and saves installation time.

There is no advantage as most new copper cabling network designs are based on category 3 or 5E for horizontal cabling.

Pre-terminated cabling has a higher fire rating.

Pre-terminated cabling makes ordering of the copper cables more complex, as you need to know in advance on which side the male or female connector needs to be located.

NO.37 A data center has its own power supply from the public utility and receives chilled water supply from the building owner.
What needs to be taken into consideration when calculating the PUE?

Nothing, as the chiller plant in the building also uses electrical power

You will need to take the value for COP of the chiller plant into consideration

You will need to take a weight factor of 0.4 for district chilled water into consideration

PUE calculations are not possible in shared buildings

NO.38 A computer room needs to be fitted out with a gas-based fire suppression system. The computer room will be a high-density data center with about 30% of the racks being closed circuit cooling blade-center racks.
Should the supplier of the fire suppression system be informed on the design of the racks?

No, cooling and design of racks have no influence on the fire suppression system design.

Only when the rack height obstructs a potential fire suppression release point.

Yes, the design of the racks has an influence on the fire suppression system design.

Only when the racks might block access to the fire panel.

NO.39 A data center requires an audit to find out whether it conforms with ANSI/TIA-942 Rated-3 (concurrently maintainable).
Will the network architecture be part of this audit?

No, as concurrently maintainable only applies to electrical and mechanical (power and cooling).

Yes, but only if the network administration does not comply with ANSI/TIA-606.

Yes, amongst other aspects, the network architecture should be Rated-3 compliant with the requirements of ANSI/TIA-942.

No, only the type of cabling used will be audited.

NO.40 You are allowed to use a calculator for this question.
A computer room has a net volume of approximately 2,500 m³ / 88,287 ft³.
The temperature is 20 °C / 68 °F.
The required design concentration is 7%.
The S-Factor is 0.1359 (metric) / 1.885 (imperial).
Calculate the amount of gas required for this computer room based on FM200. What is the correct weight?

Approximately 410 kg / 900 lbs

Approximately 820 kg / 1,800 lbs

Approximately 1,390 kg / 3,000 lbs

Approximately 1,640 kg / 3,600 lbs

NO.41 A data center scores Rated-3 in mechanical, Rated-4 in electrical, and Rated-2 in architectural.
What is the overall Rating of this data center when the Rating is based on the ANSI/TIA-942?

Rated-2 since that is the lowest rating received

Rated-4 since that is the highest rating received

Rated-4 since electrical is more important than mechanical and architectural

Depends on the Rating scored in telecommunications

NO.42 When are the wet bulb and dry bulb temperatures identical?

When the dry bulb’s temperature is at the lowest allowable temperature for IT equipment as per ASHRAE

When the dry bulb’s temperature is at the highest allowable temperature for IT equipment as per ASHRAE

When the relative humidity is at the best practice value for relative humidity, being 50% RH

When the relative humidity is 100%

NO.43 What precaution shall be taken for cabling leading into an equipment rack when a data center is in a seismic-prone area?

Cables should be loosely organized to allow for movement and be latched at the connectors.

Cables shall be tightly organized to the rack and trays to avoid movement.

Cables can be organized in any way as it is not important.

Cables should be replaced by busbar trunking.

NO.44 An air-conditioner unit needs to be selected. Two types are available:
Unit-A has a Sensible Heat Ratio (SHR) of 0.7.
Unit-B has a Sensible Heat Ratio (SHR) of 0.9.
From an efficiency point of view, which one should be selected?

It does not matter, as the Sensible Heat Ratio has nothing to do with efficiency.

Not relevant, as Sensible Heat Ratio is only specified for air-conditioner equipment to indicate the ratio between intake temperature and exhaust temperature.

Unit A

Unit B

NO.45 The data center has been in operation for about 1 year and 2 months. The dust levels in the computer room are relatively high.
What is the most likely root cause?

The cleaning crew is not doing their work properly

Every computer room has high dust levels due to constant high-speed air movement

Low pressure in the computer room

Floorboards are most likely not fitted correctly

EXIN CDCS Exam Syllabus Topics:

Topic	Details
Topic 1	Designing and Implementing a Data Centre: In this module, the exam assesses the knowledge of Exin data center professionals tasked with the design and implementation of data centers. Candidates will learn the key principles of creating an efficient data center layout, including considerations for scalability, redundancy, and security.
Topic 2	Data Centre Life Cycle and Standards: This section of the exam measures the skills of data center professionals and covers the various stages involved in the life cycle of a data center, from planning and design to implementation and decommissioning.
Topic 3	Data Centre Environmental Considerations and Efficiency: This section evaluates the proficiency of data center professionals in addressing environmental factors and promoting efficiency within data center operations. The target audience, including data center managers and engineers, will be tested on their ability to identify and implement measures that enhance energy efficiency, cooling management, and sustainable practices.

CDCS certification guide Q&A from Training Expert DumpsTests: https://www.dumpstests.com/CDCS-latest-test-dumps.html

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[Jul-2025] Verified CDCS dumps Q&As – CDCS dumps with Correct Answers [Q22-Q45]

EXIN CDCS Exam Syllabus Topics:

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