Exin Exam CDCS Topic 2 Question 10 Discussion

Actual exam question for Exin's CDCS exam

Question #: 10
Topic #: 2

[All CDCS Questions]

A computer room with a raised floor has been designed with racks in a hot/cold aisle setup.

What should you recommend for the placement of down-flow air conditioners?

AAir conditioners perpendicular to (at the end of the row of) the Cold-Aisle

BAir conditioners perpendicular to (at the end of the row of) the Hot-Aisle

CAir conditioners should always be placed at both sides of each row of racks

DAir conditioner placement has no influence on cooling effectiveness and efficiency. Hence, they can be placed at any convenient location.

Show Suggested Answer

Suggested Answer: B

To determine the charging current for a battery bank, a general rule of thumb is that the charging current should be 5% of the total battery capacity. For a battery rated at 600 Ah, this calculation would be:

600Ah0.05=30Amperes600 , text{Ah} times 0.05 = 30 , text{Amperes}600Ah0.05=30Amperes

This ensures the battery is charged efficiently without overloading the rectifier or risking battery damage.

Detailed Explanation:

Battery charging current is typically set as a percentage of the battery's capacity to balance effective charging with longevity and safety. A 5% charging rate is standard for lead-acid batteries, which would be 30 Amperes for a 600 Ah battery bank.

EPI Data Center Specialist References:

EPI standards recommend calculating charging currents based on a percentage of the battery capacity to ensure safety and efficiency, aligning with best practices for battery management in data centers.

by Daron at Jan 24, 2025, 02:22 PM

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Reena

I think the air conditioners should be perpendicular to the Cold-Aisle.

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