Free CDCP Data Center Cooling Questions and Answers

Question 1

What can you do if the top sensor on a rack displays a high temperature alarm?

Accepted Answer

Check blanking panel placement

Answer

Tell customer it will fix itself

Answer

Open floor tile to bring temp back in spec

Answer

Disable sensor and re-enable at a later time

Question 2

What should you check first if your cooling tower alarms for a high water temperature?

Accepted Answer

Check to see if fan is running

Answer

Monitor chemical levels

Answer

Check for bird strikes

Answer

None of the above

Question 3

What results in a CRAC unit's low-pressure alarm?

Accepted Answer

All of the above

Answer

Blower motor failure

Answer

The belts haven’t been adjusted properly

Answer

Restricted airflow

Answer

Dirty filters

Answer

Loss of refrigerant

Question 4

What is the main mechanical distinction between computer room air handlers (CRAHs) and CRACs?

Accepted Answer

CRACs have refrigeration compressors as part of their primary system

Answer

CRACs cannot control humidity at supply like CRAHs can

Answer

CRAHs can not be isolated from the rest of the HVAC system for maintenance

Answer

CRAHs have refrigeration compressors as part of their primary system

Question 5

Which of the following benefits of "cold aisle confinement" is NOT one of them?

Accepted Answer

No need for ‘tile management’

Answer

Better control of peak temperature in the server racks

Answer

Work environment for technicians when compared to ‘hot aisle containment’

Answer

Increased efficiency of HVAC systems

Question 6

What is the main issue with your HVAC system having too little humidity?

Accepted Answer

Static build up that can cause major electrical damage

Answer

Personal comfort is reduced

Answer

Condensation collecting in the server racks

Answer

Fluctuating temperatures in the HVAC cycle

Question 7

What are the most detrimental effects of having an excessive number of perforated tiles in a datacenter?

Accepted Answer

It reduces the overall underfloor pressure, while also reducing overall cooling impact

Answer

It is bad for the environment due to increased C02 from overworked compressors

Answer

It starves CRAC units from return air which overloads fans

Answer

It overloads the CRAC units supporting the space

Question 8

By putting perforated tiles just in the locations you want to direct cooling, raised floor cooling can assist in providing directed cooling. What is the maximum amount of air perforated tiles can supply?

Accepted Answer

500 to 600 CFM

Answer

450 to 550 CFM

Answer

300 to 400 CFM

Answer

150 to 250 CFM

Question 9

What follows DOES NOT belong in the "refrigeration cycle"?

Accepted Answer

Aeration

Answer

Expansion

Answer

Compressor

Answer

Condenser

Question 10

Which one of these supports cooling via a refrigeration cycle?

Accepted Answer

All of the above

Answer

Heat Transfer dynamics

Answer

Low boiling point compounds

Answer

Heat of Compression

Answer

Heat of Compression