CDCS CDCS Power & Cooling Systems

Question 1

What does PUE (Power Usage Effectiveness) measure in a data center?

Accepted Answer

The ratio of total facility power to IT equipment power

Answer

PUE is calculated by dividing total facility power consumption by the power consumed by IT equipment, where a value of 1.0 is perfect efficiency.

Question 2

Which UPS topology provides the highest level of power protection for critical data center loads?

Accepted Answer

Double-conversion (online)

Answer

Double-conversion (online) UPS continuously converts AC to DC and back, isolating IT equipment from all power anomalies and providing zero transfer time during outages.

Question 3

What is the primary purpose of a static transfer switch (STS) in a data center power distribution system?

Accepted Answer

To provide sub-cycle transfer between two independent power sources

Answer

An STS transfers the load between two independent AC sources in less than a half cycle, preventing any detectable interruption to dual-corded equipment.

Question 4

In data center cooling, what does CRAC stand for?

Accepted Answer

Computer Room Air Conditioner

Answer

CRAC (Computer Room Air Conditioner) is a unit that monitors and maintains the temperature, air distribution, and humidity in a data center.

Question 5

What is the recommended approach to prevent hot aisle/cold aisle mixing in a data center?

Accepted Answer

Deploy containment systems to separate hot exhaust from cold supply air

Answer

Hot aisle/cold aisle containment physically separates hot exhaust air from cold supply air, dramatically reducing recirculation and improving cooling efficiency.

CDCS - Certified Data Center Specialist Practice Test

CDCS - Certified Data Center Specialist Practice Test

CDCS CDCS Power & Cooling Systems