EXIN EXIN-CDCP Online Practice Questions and Exam Preparation

EXIN EXIN-CDCP Online Questions & Answers

• Question 51:

  Management must choose between two facility improvements.

  Which basis should guide the decision?

  A. The preference of the most senior technician
  B. The option with the most complex design
  C. Business impact, risk reduction, and lifecycle value
  D. The option with the longest vendor presentation
  C. Business impact, risk reduction, and lifecycle value

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  Explanation

  Investment decisions should connect technical improvements to business consequences, reduced exposure, and value over the useful life of the solution. Seniority, complexity, and presentation length do not demonstrate value.

• Question 52:

  What is a disadvantage of a Dynamic UPS?

  A. They are heavy and more noisy.
  B. It needs a separate back-up generator as their autonomy time is less than 60 seconds.
  C. It needs additional cooling infrastructure as high temperatures reduces the lifetime of a Dynamic UPS.
  D. They are only available for small to medium sized data centres, due to their limited capacity of 200 kVA
  A. They are heavy and more noisy.

• Question 53:

  Which one of the following is used in Measuring Business Value?

  A. Regeneration Cost
  B. Scalability
  C. Reliability
  D. Upfront Cost
  B. Scalability

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  Explanation

  Measuring business value is the process of assessing the benefits and costs of IT investments and initiatives in relation to the strategic objectives and priorities of the organization. One of the factors that can be used to measure business value is scalability, which is the ability of a system or component to handle increasing workloads or demands without compromising performance, quality, or functionality. Scalability is important for business value because it enables the organization to adapt to changing market conditions, customer expectations, and growth opportunities. Scalability can also reduce operational costs, increase efficiency, and improve customer satisfaction. Therefore, scalability is one of the factors that can be used in measuring business value.

• Question 54:

  Which type of copper wire is used for grounding the racks to the SRG?

  A. Thin copper cable to keep the cost low for grounding.
  B. Thick copper cable to create better grounding.
  C. Braided copper wire or flat copper strip.
  D. Copper cable with plastic insulation (isolation).
  C. Braided copper wire or flat copper strip.

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  Explanation

  The type of copper wire that is used for grounding the racks to the SRG (signal reference grid) in a data centre is braided copper wire or flat copper strip, according to the CDCP Preparation Guide1 and various web sources 234. Braided copper wire or flat copper strip are preferred over thin or thick copper cable for grounding purposes, because they havelower impedance and higher surface area, which allow better dissipation of electrical noise and interference. Moreover, braided copper wire or flat copper strip are more flexible and durable than copper cable, which make them easier to install and maintain. Braided copper wire or flat copper strip should be connected to the SRG using exothermic welding or other code-compliant methods, and should follow the relevant standards and codes, such as ANSI/TIA/EIA-607 and NFPA 70.

• Question 55:

  Mean time between failures is best considered a measure of:

  A. Size
  B. Cost
  C. Duration
  D. Reliability
  D. Reliability

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  Explanation

  Mean time between failures (MTBF) is a measure of the reliability of a system or component. It represents the average time that a system or component will operate before it fails. The higher the MTBF, the more reliable the system or component is. MTBF is calculated by dividing the total time of operation by the number of failures that occur during that time. MTBF is used to compare the reliability of similar systems or components, and to help with maintenance planning, inventory management, and system design.

• Question 56:

  What needs to be installed in the battery room when using Lithium-ion batteries?

  A. A battery management system to monitor and prevent unsafe temperatures during charging/ discharging.
  B. High capacity air-conditioning equipment since Lithium-ion batteries are sensitive to high temperatures, which can reduce their lifetime.
  C. A proper ventilation system since Lithium-ion batteries produce highly flammable Hydrogen gas during charging.
  D. A proper supply of distilled water.
  A. A battery management system to monitor and prevent unsafe temperatures during charging/ discharging.

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  Explanation

  According to the EPI Data Centre Training Framework, lithium-ion batteries are becoming more popular in data centres due to their higher energy density, longer lifespan, and lower maintenance costs compared to lead-acid batteries. However, lithium-ion batteries also have some drawbacks, such as higher initial cost, stricter safety requirements, and potential thermal runaway risks. Therefore, a battery management system (BMS) is essential to monitor and control the voltage, current, temperature, and state of charge of each battery cell or module, and to prevent overcharging, over-discharging, or overheating. A BMS can also communicate with the UPS system and provide information on the battery status, performance, and health.

• Question 57:

  Which formula can provide a simple 'cost of downtime per hour" without taking seasonality and other factors into account?

  A. Revenue/52
  B. Revenue/1024
  C. Revenue/365
  D. Revenue/8760
  D. Revenue/8760

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  Explanation

  8760 is the number of hours in a year (24 hours x 365 days). Dividing annual revenue by 8760 gives a basic average revenue per hour, commonly used in downtime cost calculations.

  References:

  CDCP Exam Preparation Guide, page 34

  EPI Data Centre Professional Course Materials

• Question 58:

  Which measure is most useful for identifying a developing reliability concern?

  A. A trend in repeated faults or warning conditions
  B. The number of visitors entering the reception area
  C. The age of the newest office furniture
  D. The length of equipment model names
  A. A trend in repeated faults or warning conditions

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  Explanation

  Repeated faults and warning trends can reveal deterioration before a major service effect occurs. Unrelated administrative or cosmetic measures do not indicate technical reliability.

• Question 59:

  Which Class of Fires involves ordinary combustible materials such as paper, wood and cloth?

  A. Class A
  B. Class B
  C. Class D
  D. Class K
  A. Class A

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  Explanation

  According to the CDCP Preparation Guide, Class A fires involve ordinary combustible materials such as paper, wood and cloth. These materials leave behind ash or embers when they burn. Class A fires can be extinguished by water or other cooling agents that reduce the temperature of the fuel below its ignition point.

• Question 60:

  Starting from which Rating does the requirement of Concurrently Maintainability becomes relevant?

  A. Rated-4
  B. Rated-3
  C. Rated-2
  D. Rated-1
  B. Rated-3

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  Explanation

  The requirement of Concurrently Maintainability becomes relevant starting from Rated-3, according to the Uptime Institute Tier Classification System1. Concurrently Maintainability means that any component or system in the data centre can be maintained or replaced without affecting the availability of the IT equipment.

  This requires having redundant capacity components and multiple independent distribution paths serving the IT equipment. Rated-3 data centres are designed to achieve Concurrently Maintainability and have a minimum uptime of 99.982%. Rated-4 data centres also have Concurrently Maintainability, but they also have Fault Tolerance, which means that they can withstand any single unplanned event without affecting the availability of the IT equipment. Rated-4 data centres have a minimum uptime of 99.995%.

  Rated-1 and Rated-2 data centres do not have Concurrently Maintainability, as they have only one distribution path serving the IT equipment and no redundant capacity components. Rated-1 data centres have a minimum uptime of 99.671% and Rated-2 data centres have a minimum uptime of 99.741%.