CDCP - Certified Data Centre Professional Cooling and Environmental Control Questions and Answers

Question 1

A data center manager is reviewing the environmental conditions of a server room housing enterprise-grade servers and storage.
According to ASHRAE TC 9.9 thermal guidelines for Class A1 equipment, which of the following represents the recommended temperature range at the IT equipment intake?

Accepted Answer

18°C to 27°C (64.4°F to 80.6°F)

Answer

5°C to 15°C (41°F to 59°F)

Answer

28°C to 35°C (82.4°F to 95°F)

Answer

10°C to 40°C (50°F to 104°F)

Question 2

A data center is experiencing issues with electrostatic discharge (ESD) causing intermittent component failures. Which environmental condition is the most likely cause of this problem?

Accepted Answer

Low relative humidity (<40% RH)

Answer

High airflow velocity

Answer

Temperature fluctuations

Answer

High relative humidity (>70% RH)

Question 3

Which of the following best describes the primary operational difference between a Computer Room Air Conditioner (CRAC) unit and a Computer Room Air Handler (CRAH) unit?

Accepted Answer

CRAC units use a refrigerant-based direct expansion (DX) system, while CRAH units use chilled water.

Answer

CRAC units use hot aisle containment, while CRAH units use cold aisle containment.

Answer

CRAC units are designed for low-density racks, while CRAH units are only for high-density racks.

Answer

CRAC units only control temperature, while CRAH units control both temperature and humidity.

Question 4

A data center manager implements a hot aisle/cold aisle containment strategy. What is the primary benefit of this design approach?

Accepted Answer

It prevents the mixing of cool supply air and hot equipment exhaust air, improving cooling efficiency.

Answer

It increases the floor load capacity by concentrating server rack weight.

Answer

It simplifies underfloor cabling by creating dedicated pathways.

Answer

It reduces the need for a fire suppression system by isolating potential fire sources.

Question 5

When designing an environmental monitoring system for a new data center, where does ASHRAE recommend placing temperature sensors for the most effective thermal management of a server rack?

Accepted Answer

At least six sensors: top, middle, and bottom at both the front (intake) and back (exhaust) of the rack.

Answer

One sensor at the top of the rack and one at the bottom.

Answer

A single sensor placed in the center of the hot aisle.

Answer

One sensor per cooling unit to measure the return air temperature.

Question 6

A facility manager is evaluating cooling solutions for a large, new hyperscale data center. The facility has a central chilled water plant. Which cooling technology is generally more energy-efficient and scalable for this type of environment?

Accepted Answer

Computer Room Air Handler (CRAH) units

Answer

In-row precision cooling units

Answer

Computer Room Air Conditioner (CRAC) units

Answer

Direct-to-chip liquid cooling