CDCP Cooling and Environmental Control 4

Question 1

What is the primary purpose of a containment system (hot aisle/cold aisle containment) in a data center?

Accepted Answer

Prevent mixing of hot exhaust and cold supply air

Answer

Containment systems physically separate hot exhaust air from cold supply air, dramatically improving cooling efficiency.

Question 2

In a data center, what does CRAH stand for?

Accepted Answer

Computer Room Air Handler

Answer

CRAH (Computer Room Air Handler) uses chilled water coils—rather than refrigerant like CRAC units—to cool the air.

Question 3

Which metric is used to measure the efficiency of a data center's cooling system relative to total IT load?

Accepted Answer

COP

Answer

COP (Coefficient of Performance) specifically measures cooling efficiency as the ratio of cooling output to electrical energy input.

Question 4

What is the recommended approach when a data center experiences hot spots despite adequate overall cooling capacity?

Accepted Answer

Add blanking panels and seal cable cutouts in affected racks

Answer

Blanking panels and sealed cutouts prevent bypass airflow and recirculation, directing cold air where it is needed.

Question 5

A data center is transitioning to a higher rack power density of 20 kW per rack. Which cooling approach is most likely required?

Accepted Answer

In-row or rear-door heat exchanger cooling

Answer

High-density racks (above ~10 kW) typically require in-row or rear-door heat exchangers to remove heat closer to the source.

CDCP - Certified Data Centre Professional Practice Test