CDCP Data Center Operations and Maintenance 4

Question 1

During a preventive maintenance window, a UPS battery string fails a capacity test at 78% of rated capacity. What is the recommended action?

Accepted Answer

Replace the entire battery string immediately

Answer

A battery string failing below 80% of rated capacity is the standard threshold for immediate replacement to ensure reliable backup power.

Question 2

Which metric is most critical when evaluating the efficiency of a data center cooling system?

Accepted Answer

Cooling system COP (Coefficient of Performance)

Answer

COP measures the ratio of cooling output to energy input, directly reflecting cooling system efficiency.

Question 3

A data center operations team is implementing a change to add a new PDU. Which document must be updated FIRST before energizing the new PDU?

Accepted Answer

Single-line electrical diagram

Answer

The single-line electrical diagram must be updated first as it is the authoritative reference for safe electrical work and lockout/tagout procedures.

Question 4

What is the purpose of a 'hot aisle containment' strategy in data center operations?

Accepted Answer

Prevent mixing of cold supply air with hot exhaust air

Answer

Hot aisle containment captures server exhaust air directly and routes it to cooling units, preventing recirculation and improving cooling efficiency.

Question 5

A facility manager notices the PUE has risen from 1.45 to 1.68 over three months. What is the MOST likely cause to investigate first?

Accepted Answer

Cooling system inefficiency or failure

Answer

A rising PUE with stable IT load typically indicates cooling overhead has increased, pointing to cooling system degradation or misconfiguration.

CDCP - Certified Data Centre Professional Practice Test