CDCS 試験問題を無料オンラインアクセス

The electrical diagram of the data center shows the following UPS configuration and has a load of 80 kW.
What is the set-up in this data center?

• A.2+N+1
• B.(N+1)-(N+1)
• C.2(N+1)
• D.N+N(+1)

It is assumed that EMF shielding material must be installed as the EMF levels coming from the transformer room into the computer room are measured at 100mG. The transformer room is approximately 10 meters away from the computer room and is separated by a corridor. You can assume that no physical issues are present for installing shielding material at any area/location.
Where should you recommend the shielding material to be installed?

• A.It does not matter, either close to the transformer room or the computer room is okay as there is no impact to cost or shielding material performance
• B.As close as possible to the computer room
• C.As close as possible to the transformer room
• D.Shielding is not required to be installed as 100mG is within the acceptable levels for computer rooms

The air intake of the mission-critical server at the top of the rack is measuring 25 °C/77 °F.
Is this acceptable?

• A.Yes, this is allowed according to the standards and guidelines
• B.As long as it does not exceed the average server room temperature of 38 °C/100 °F
• C.No, the temperature needs to be 20 °C/68 °F
• D.Depends on the ANSI/TIA-942 Rating the data center needs to comply with

You are working with a customer who requires a guarantee that THDi levels coming from the UPS should not exceed more than 3% THDi. Furthermore, he wants to run a power-efficient data center. The UPS has a 6-Pulse SCR/Thyristor based rectifier. The current load on the UPS is approximately 80%. The customer indicates they are not expecting any changes on the ICT infrastructure for the next 3 years.
What should you recommend?

• A.Nothing, the UPS will be able to take care of the right levels of THDi
• B.Install a passive harmonic filter on the UPS
• C.Install an isolation transformer rated at K13 or K20
• D.Install an active harmonic filter on the UPS

You have three UPS systems connected in parallel. The UPS systems have an imbalance in the load sharing of approximately 20%.
What should you recommend?

• A.Review the common mode noise levels within the computer room
• B.Review the cable lengths of each UPS to the common busbar
• C.Nothing, there is no reason for any concern
• D.Review the harmonics levels within the computer room