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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Nelida

11 days ago

I heard the secret to optimal cooling is to just put a giant fan in the middle of the room and let it rip. That way, the hot air will be circulated evenly and the servers will be as cool as a cucumber. Trust me, I'm an HVAC expert. Well, at least in my dreams.

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Brandon

15 days ago

Forget the air conditioners, I say we just open the windows and let Mother Nature handle the cooling. That's the eco-friendly way to go, right? Or maybe we can just have the IT guys run on treadmills to power the servers. Problem solved!

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Amina

4 days ago

A: Air conditioners perpendicular to (at the end of the row of) the Hot-Aisle

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Marjory

20 days ago

Option D is the way to go. Who cares where the air conditioners are placed? As long as they're there, the room will be cool, right? It's not rocket science, people.

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Stephaine

24 days ago

Why choose just one when you can have both? Option C seems like the way to go - air conditioners on both sides of each row. Gotta keep those servers cool, am I right?

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Rhea

27 days ago

I'm not so sure about that. Wouldn't it make more sense to have the air conditioners at the end of the cold aisle so the cold air is evenly distributed throughout the racks? Just my two cents.

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Arlen

9 days ago

Having the air conditioners at the end of the cold aisle makes sense for better airflow and cooling distribution.

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Sunny

10 days ago

It's important to have a strategic placement of the air conditioners to optimize cooling efficiency in the computer room.

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Bo

12 days ago

I agree. Placing the air conditioners perpendicular to the cold aisle would ensure better cooling for the racks.

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Lindsay

16 days ago

I think you're right. Having the air conditioners at the end of the cold aisle would help distribute the cold air more effectively.

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Leslee

28 days ago

Option B is clearly the right choice. Placing the air conditioners at the end of the hot aisle ensures that the cold air is directed straight into the racks, maximizing cooling efficiency.

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