Free EXIN EPI Certified Data Centre Specialist Exam CDCS Exam Practice Test

What should be considered when installing overhead data cabling?

• To maintain minimum separation from power and ensure that the fire detection and suppression systems are not hindered.
• Copper data cabling should not be placed in metal cable trays.
• Optical fiber cabling should always be positioned on top of the copper cabling in the same cable tray to avoid damage to the sensitive optical fiber.
• All cabling should make sharp bends directly into the rack to avoid usage of additional space and blocking the airflow on top of the rack.

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

A data center has its own power supply from the public utility and receives chilled water supply fromthe 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

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

The 'maximum exposed area' of the fire-rated glass is defined by the supplier as 3 sqm/32 sqft. The window area is 4 sqm/43 sqft.What would be the best option?

• Do not use fire-rated glass due to the size limit and replace it with normal glass.
• Split the window in two equal parts using an aluminum frame.
• Split the window into parts smaller than specified as the maximum exposed area and ensure fire- rated frames are used.
• Split the window in two equal parts fitted together with transparent silicon glue.

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

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

What is a potential disadvantage of using water mist as a fire extinguishing system?

• It only uses 10% of the water normally used in a water-based fire suppression, which might not be enough to suppress the fire
• It will rapidly increase the humidity level in the data center, which can cause a potential risk for the operation of the equipment
• It extracts oxygen from the air creating a potential risk for humans inside the computer room
• It has droplets that are too small (100-120 microns) so it can only be used for small fires

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.

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