EXIN CDCS EXIN EPI Certified Data Centre Specialist Online Training
EXIN CDCS Online Training
The questions for CDCS were last updated at Mar 10,2025.
- Exam Code: CDCS
- Exam Name: EXIN EPI Certified Data Centre Specialist
- Certification Provider: EXIN
- Latest update: Mar 10,2025
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?
- A . UPS efficiency
- B . Inverter efficiency
- C . Load imbalance on the phases
- D . Available battery charging current
The pipes of a VESDA smoke detection system are installed at the air intake of the air conditioner inside the computer room.
Is this a good practice from an early smoke detection point of view?
- A . It depends on the type of gas-based fire suppression which will be installed.
- B . Yes, as this reduces the amount of piping to be installed in the data center, as all air will go through the air conditioner.
- C . No, the piping should be installed at the air exhaust of the air conditioner, as there can also be a fire inside the air conditioner itself.
- D . No, it will give a longer reaction time for the smoke detection system and there might also be bypass airflow.
You need to determine the strategy for the cooling audit. All the servers are based on a front-to-rear (F-R) airflow design.
Which location for the temperature/humidity measurement should you recommend for the audit?
- A . At the back/rear of the server at 50 mm/2 inch
- B . At 1.5 meters/5 feet above the floor in the middle of the cold aisle
- C . At the front/intake of the server at 50 mm/2 inch
- D . At 1.5 meters/5 feet above the floor in the middle of the hot aisle
You are installing new copper cabling.
What is the advantage or disadvantage of choosing pre-terminated category 6 or 6A cabling?
- A . Pre-terminated cabling is already factory tested and saves installation time.
- B . There is no advantage as most new copper cabling network designs are based on category 3 or 5E for horizontal cabling.
- C . Pre-terminated cabling has a higher fire rating.
- D . 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.
When are the wet bulb and dry bulb temperatures identical?
- A . When the dry bulb’s temperature is at the lowest allowable temperature for IT equipment as per ASHRAE
- B . When the dry bulb’s temperature is at the highest allowable temperature for IT equipment as per ASHRAE
- C . When the relative humidity is at the best practice value for relative humidity, being 50% RH
- D . When the relative humidity is 100%
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?
- A . No, as long as the equipment is less than 700 kg/1,500 lbs it will be within the limits.
- B . 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.
- C . Yes, additional floor loading calculations need to be done by the floor manager, which should be verified by the safety engineer.
- D . Yes, a structural engineer, approved/endorsed by the building owner, should carry out new floor loading calculations.
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?
- A . Nothing, as the chiller plant in the building also uses electrical power
- B . You will need to take the value for COP of the chiller plant into consideration
- C . You will need to take a weight factor of 0.4 for district chilled water into consideration
- D . PUE calculations are not possible in shared buildings
What is the main reason to install Earth Leakage protection?
- A . Protection of ICT equipment against high-frequency noise currents
- B . Protection of human lives
- C . Improvement of the data center grounding/earthing system
- D . Protection against lightning strikes
The noise levels in the data center are approximately 91 dB (A).
Do employers need to take precautions?
- A . No, anything less than 100 dB (A) is acceptable.
- B . There are no regulations regarding noise levels inside a building. Regulations only apply to noise pollution outside of the building.
- C . As long as the data is compliant to ISO/IEC 27001 it is acceptable.
- D . Yes, since it is mandated by regulations.
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?
- A . The UPS will not synchronize to any of the feeds but use an internal clock to set the output voltage and frequency
- B . Depends on the setting of the UPS, as the UPS can normally be set to either feed
- C . Feed A
- D . Feed B
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