CDCP Energy Efficiency and Sustainability 4

Question 1

Which metric specifically measures the ratio of IT equipment energy consumption to total facility energy consumption?

Accepted Answer

Data Centre Infrastructure Efficiency (DCiE)

Answer

DCiE (Data Centre Infrastructure Efficiency) is the reciprocal of PUE and expresses IT load as a percentage of total facility power, directly measuring the proportion of energy reaching IT equipment.

Question 2

A data centre is located near a cold climate region and uses outside air for cooling. What is this technique called?

Accepted Answer

Economizer mode (free cooling)

Answer

Economizer mode, also called free cooling, uses ambient outside air when temperatures are low enough to cool the data centre without mechanical refrigeration, significantly reducing cooling energy.

Question 3

What does the term 'stranded power' refer to in data centre capacity planning?

Accepted Answer

Reserved power capacity not associated with active IT load

Answer

Stranded power is reserved but unused power capacity—typically allocated to racks or zones but not consumed by IT equipment—reducing overall data centre efficiency.

Question 4

Which international standard provides a framework specifically for energy management systems applicable to data centres?

Accepted Answer

ISO 50001

Answer

ISO 50001 defines requirements for establishing, implementing, and maintaining an energy management system (EnMS), and is applicable to data centres seeking certified energy governance.

Question 5

A data centre operator wants to reduce PUE by optimizing airflow. Which of the following actions would be MOST effective?

Accepted Answer

Implementing hot aisle/cold aisle containment

Answer

Hot aisle/cold aisle containment prevents mixing of supply and return air, allowing cooling systems to operate more efficiently and directly lowering PUE.

CDCP - Certified Data Centre Professional Practice Test

CDCP - Certified Data Centre Professional Practice Test

CDCP Energy Efficiency and Sustainability 4