実用的-正確的なCDCSテスト模擬問題集試験-試験の準備方法CDCS試験勉強書
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世界は急速に変化しており、従業員に対する要件はこれまでになく高くなっています。JPNTest 理想的な仕事を見つけて高収入を得たい場合は、優れた労働能力と深い知識を高めなければなりません。 EXIN EPI Certified Data Centre Specialist認定に合格すると、夢を実現できます。 製品を購入すると、最高のEXIN EPI Certified Data Centre Specialist学習教材が提供され、EXIN EPI Certified Data Centre Specialist認定の取得に役立ちます。 当社EXINの製品はCDCS高品質であり、当社のサービスは完璧です。
EXIN CDCS 認定試験の出題範囲:
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完璧なCDCSテスト模擬問題集 & 合格スムーズCDCS試験勉強書 | 正確的なCDCS再テスト
JPNTestはEXINのCDCS「EXIN EPI Certified Data Centre Specialist」試験に向けて問題集を提供する専門できなサイトで、君の専門知識を向上させるだけでなく、一回に試験に合格するのを目標にして、君がいい仕事がさがせるのを一生懸命頑張ったウェブサイトでございます。
EXIN EPI Certified Data Centre Specialist 認定 CDCS 試験問題 (Q63-Q68):
質問 # 63
Given: A = attenuation in dB, R = real measured value, M = maximum acceptable value. Which formula should be used to calculate the required attenuation factor of EMF shielding material?
- A. A = 10 log (M/R)
- B. A = 20 log (R/M)
- C. A = 20 log (M/R)
- D. A = 10 log (R/M)
正解:A
解説:
Attenuation is the logarithmic ratio between input and output signals. For power, we use 10 log; for voltage or current, 20 log. Since EMF shielding is measured as field strength (V/m or A/m), power relationship is proportional to the square of field. Thus the correct attenuation calculation for shielding effectiveness is:
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where:
* M = maximum permissible field strength
* R = measured field strength after shielding
This ensures the shield reduces field intensity to below allowable limits.
References: IEEE Std 299 (Shielding Effectiveness Measurement), IEC 61000-5-7 (EMC mitigation).
質問 # 64
You are allowed to use a calculator for this question. A battery bank is rated at a total capacity of 600 Ah.
Calculate how much charging current the rectifier should be able to supply as charging current.
- A. 60 Amperes
- B. 80 Amperes
- C. 12 Amperes
- D. 30 Amperes
正解:D
解説:
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:
600 Ah×0.05=30 Amperes600 , ext{Ah} imes 0.05 = 30 , ext{Amperes}600Ah×0.05=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.
質問 # 65
Does hot/cold aisle containment impact PUE?
- A. Yes, avoidance of mixing improves PUE
- B. No, airflow has no impact on power
- C. Yes, but not with cooling towers
- D. No, unless using virtualization
正解:A
解説:
Hot and cold aisle containment prevents mixing of supply and return air, which improves cooling efficiency.
By maintaining higher return-air temperatures, cooling units operate more efficiently, often allowing higher chilled water setpoints. This reduces overall cooling power consumption, directly improving PUE (Power Usage Effectiveness).
Containment is recognized by ASHRAE and Green Grid as one of the simplest and most cost-effective methods for lowering PUE. Options A, C, and D are false because containment benefits apply regardless of cooling source or IT virtualization.
References: ASHRAE TC 9.9 - Airflow Management, The Green Grid White Paper #42.
質問 # 66
What is the minimum requirement for power feeds to a Rated-4 data center (ANSI/TIA-942)?
- A. Two feeds from two different substations, one power company acceptable
- B. Two feeds from one substation
- C. One feed split into two distribution boards
- D. Two feeds from two different substations, one power company not acceptable
正解:A
解説:
A Rated-4 facility requires dual active utility feeds, each from an independent substation, but they may come from the same utility provider if substations are geographically separate and independent.
* Option A is too strict; ANSI/TIA-942 does not mandate two different companies.
* Options C and D do not provide true independence and would fail Rated-4 requirements.
Thus, the minimum is two substations, possibly same provider.
References: ANSI/TIA-942-B §6.2 (Utility Service Requirements).
質問 # 67
Smoke sensors need to be tested to ensure that they pick up a potential fire in the data center.
What should you recommend?
- A. Press the self-test button on each sensor in the data center
- B. Inject smoke at the floor level
- C. Test the sensors by injecting smoke or simulated smoke directly into the sensor
- D. Test the sensors according to the vendor specification
正解:D
解説:
Testing smoke sensors should be conducted according to the vendor specifications to ensure compliance with safety standards and accurate results. Vendors provide specific testing procedures to account for the sensor type, environment, and operational characteristics, ensuring that tests do not damage the equipment or provide false results.
Detailed Explanation:
Smoke sensors can vary by type and sensitivity, so following the vendor's recommended testing procedure ensures the sensors function correctly without risking sensor damage. Injecting smoke or using a self-test might be insufficient or could lead to inaccurate assessments if they do not align with the vendor's testing protocol.
EPI Data Center Specialist References:
EPI recommends adhering to manufacturer specifications for testing critical safety equipment, ensuring that tests reflect real-world conditions without compromising sensor integrity or reliability.
質問 # 68
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