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

The ratio of IT equipment power to cooling power

Answer

The percentage of power used by servers alone

Answer

The total kilowatt-hours consumed per month

Question 2

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

Accepted Answer

Double-conversion (online)

Answer

Standby (offline)

Answer

Line-interactive

Answer

Delta-conversion

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

To convert DC power to AC power

Answer

To step down high-voltage utility feeds

Answer

To monitor power quality and log anomalies

Question 4

In data center cooling, what does CRAC stand for?

Accepted Answer

Computer Room Air Conditioner

Answer

Controlled Rack Airflow Cooling

Answer

Computer Rack Ambient Control

Answer

Centralized Refrigerant Air Cooling

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

Increase CRAC unit fan speeds

Answer

Lower server inlet temperature setpoints

Answer

Install perforated tiles throughout the entire raised floor

Question 6

Which power distribution unit (PDU) feature allows administrators to remotely cycle power to individual outlets?

Accepted Answer

Switched PDU

Answer

Metered PDU

Answer

Basic PDU

Answer

Monitored PDU