CDCS CDCS Power & Cooling Systems 3

Question 1

In data center power design, what does a 2N power path architecture mean?

Accepted Answer

Fully redundant dual power paths from utility to every rack outlet

Answer

2N architecture provides two completely independent power paths (A-feed and B-feed) from utility through UPS to each rack, so any single component failure in either path does not affect the load.

Question 2

What is an economizer (free cooling) mode in data center HVAC, and when is it most beneficial?

Accepted Answer

Leveraging cool outdoor air or water to reduce or eliminate mechanical chiller operation

Answer

Economizer mode uses outdoor ambient air or cooling tower water to reduce or eliminate compressor-based chilling when outdoor conditions are cool enough, significantly lowering energy costs.

Question 3

Which standard does BICSI TDMM follow for data center power and cooling infrastructure documentation?

Accepted Answer

TIA-942

Answer

TIA-942 is the Telecommunications Infrastructure Standard for Data Centers, defining structured cabling, power, and cooling infrastructure design tiers and documentation requirements.

Question 4

What does the term 'stranded capacity' refer to in data center power management?

Accepted Answer

Provisioned power capacity that is allocated but not actively consumed by IT loads

Answer

Stranded capacity refers to power (or space) that has been allocated or reserved for equipment but is not actually being consumed, reducing overall data center utilization efficiency.

Question 5

Which type of generator automatic transfer switch (ATS) can test the generator under load without interrupting the critical load?

Accepted Answer

Closed-transition (make-before-break) ATS

Answer

A closed-transition (make-before-break) ATS briefly parallels the generator with the utility during transfer, allowing load testing with zero transfer time and no disruption to the critical load.

CDCS - Certified Data Center Specialist Practice Test

CDCS - Certified Data Center Specialist Practice Test

CDCS CDCS Power & Cooling Systems 3