EXIN CDCS受験練習参考書 & CDCS赤本合格率
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当社の製品には多くの面で多くのメリットがあり、CDCS練習エンジンの品質を保証できます。まず、経験豊富な専門家チームが実際の試験に基づいて入念に編集します。第二に、CDCS学習教材の言語と内容の両方がシンプルです。このコンテンツは焦点を強調し、洗練されたCDCSの質問と回答を使用するキーをつかみ、学習者が最小限の実践で最も重要な情報を習得できるようにします。 3つ目は、学習者が教材を学習し、試験の準備をするのに役立つさまざまな機能を提供することです。
EXIN認証試験に参加する方はXhs1991の問題集を買ってください。CDCS試験の成功を祈ります。
CDCS赤本合格率、CDCS資格問題対応
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EXIN CDCS 認定試験の出題範囲:
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EXIN EPI Certified Data Centre Specialist 認定 CDCS 試験問題 (Q88-Q93):
質問 # 88
Which of the following statements is correct?
- A. With voltage increasing, single-phase cables emit more EMF than three-phase cables
- B. With current increasing, single-phase cables emit more EMF than three-phase cables
- C. With current decreasing, three-phase cables emit more EMF than single-phase cables
- D. With voltage decreasing, three-phase cables emit more EMF than single-phase cables
正解:B
解説:
Electromagnetic field (EMF) strength around cables is primarily influenced by current, not voltage. In a single-phase system, the live and neutral conductors are separated, creating a larger magnetic loop area. This produces stronger stray EMF when current increases.
In a balanced three-phase system, the magnetic fields from the three conductors largely cancel each other out, resulting in much lower net EMF, even at higher currents.
Therefore, the correct statement is that increasing current in single-phase cables produces higher EMF compared to three-phase cables. Options B, C, and D incorrectly link EMF to voltage or incorrect current behavior.
References: IEEE Std 141 (Red Book - Power Distribution), IEC 61000-5-7 (EMF mitigation guidelines), ANSI/TIA-942-B §6.6.
質問 # 89
Where should raised-floor installation start?
- A. Point B (side wall)
- B. Point D (corner opposite entrance)
- C. Point C (center of the room)
- D. Point A (entrance corner)
正解:C
解説:
Best practice is to begin raised-floor installation at the center of the room, working outward. This minimizes alignment errors and ensures the tile grid is centered, which is critical for aisle containment and rack alignment.
Starting at the perimeter (A, B, D) causes cutting of tiles along both sides, misalignment with rack rows, and possible airflow inefficiencies. By starting at the center, tiles can be cut symmetrically around the edges, providing better aesthetics, balanced airflow, and structural stability.
Industry guidelines such as CISCA recommend this approach for raised floors in mission-critical spaces.
References: CISCA Raised Access Floor Guidelines, ANSI/TIA-942-B §6.3.
質問 # 90
An MCB needs to be installed in the PDU of an air-conditioner unit.
Which breaking curve should you select?
- A. A-Curve
- B. B-Curve
- C. D-Curve
- D. C-Curve
正解:D
解説:
For an MCB (Miniature Circuit Breaker) in the PDU of an air-conditioning unit, a C-Curve is recommended.
C-Curve breakers are suitable for circuits with moderate inrush currents, such as those experienced in air conditioning units. They provide protection against overloads while accommodating the inrush without nuisance tripping.
Detailed Explanation:
C-Curve breakers trip when currents exceed 5 to 10 times the rated current, making them ideal for devices like air conditioners that experience moderate inrush currents upon startup. This characteristic provides a balance between protection and resilience against startup surges, preventing unnecessary trips while safeguarding the circuit.
EPI Data Center Specialist References:
EPI guidance for data center electrical systems specifies that C-Curve breakers are appropriate for equipment with inrush characteristics similar to air conditioning units, as they help prevent operational interruptions caused by typical surges during equipment start-up.
質問 # 91
What is the advantage or disadvantage of using MPO (Multi-fiber Push On)/pre-terminated fiber?
- A. It speeds up installation and provides an easy upgrade to transmission speeds up to 40 Gbit/s -100 Gbit
/s. - B. There is no advantage, as it cannot be used with OM4 optical fiber cables.
- C. There is no advantage, as it creates additional heat load in the data center.
- D. It is a very flexible system as it can be used for both copper cables and optical fiber cables.
正解:A
解説:
MPO (Multi-fiber Push On) pre-terminated fiber offers the advantage of quick installation and supports high- speed upgrades up to 40 Gbit/s and 100 Gbit/s. This technology simplifies connections by allowing multiple fibers to be connected in a single plug-and-play module, reducing installation time and making future expansions or upgrades to higher speeds easier.
Detailed Explanation:
MPO connectors consolidate multiple fiber connections into a single interface, which simplifies cable management and reduces installation complexity. This setup is particularly beneficial in data centers where high-speed networks are essential, and where rapid deployment is necessary. MPO pre-terminated fiber also supports the use of OM4 fiber, making it compatible with existing high-performance cabling infrastructure.
EPI Data Center Specialist References:
EPI training highlights that pre-terminated fiber solutions, like MPO, can greatly enhance efficiency in data centers. By reducing installation time and providing scalability for higher transmission speeds, they align with best practices for maintaining flexible and future-ready network infrastructure.
質問 # 92
The computer room has high levels of H2S gas contamination. What is the best option to resolve this issue?
- A. Clean the room and racks with a damp/wet cloth.
- B. Vacuum the whole room using a HEPA/S-Class-based filter.
- C. Provide more air changes per hour by adding more fresh air to the computer room.
- D. Install air-scrubbers.
正解:D
解説:
High levels of H2S (hydrogen sulfide) gas contamination in a computer room are best addressed by installing air-scrubbers. Air-scrubbers can effectively filter out contaminants, including corrosive gases like H2S, ensuring clean air circulation and protecting sensitive IT equipment from potential corrosion and damage.
Detailed Explanation:
Air-scrubbers are designed to remove various airborne contaminants and are particularly useful in environments where corrosive gases are present. These systems use filters or chemical reactions to neutralize harmful substances, making them ideal for data centers that need to maintain high air quality for equipment reliability.
EPI Data Center Specialist References:
EPI guidelines suggest air-scrubbing technologies to remove contaminants that pose risks to electronic equipment, maintaining air quality and reducing corrosion risk.
質問 # 93
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アフターシールサービスは、顧客への気配りのある支援ではなく、本物で忠実です。多くのクライアントは、この点で私たちを称賛するのをやめることはできません。 CDCSトレーニング資料の標準をサポートするための厳しい基準があります。CDCS試験準備は、懸念される限り、さまざまな試験に合格するための高品質な学習プラットフォームをもたらすことができます。当社の製品は、主要な質問と回答で精巧に構成されています。練習するのに20時間から30時間しかかかりません。効果的な練習の後、CDCSテスト問題から試験ポイントをマスターできます。そうすれば、合格するのに十分な自信があります。
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