[2024年06月14日]CDCP問題集完全版問題、試験学習ガイド
EPI Data Centre無料認定試験材料Fast2testからの73問題
質問 # 16
Which design consideration should be implemented with an Inergen-based fire suppression system?
- A. Install protective covers around the nozzles to avoid accidental gas dumps.
- B. Pressure relief valves are required in the room that needs protection.
- C. Install the gas containers (tanks) close to the data centre.
- D. To use Inergen only for fires which are not related to electrical power.
正解：B
解説：
A design consideration that should be implemented with an Inergen-based fire suppression system is to install pressure relief valves in the room that needs protection. Inergen is a clean agent fire suppression system that uses a mixture of inert gases (nitrogen, argon, and carbon dioxide) to displace the oxygen in the room and extinguish the fire. However, when Inergen is released into the room, it creates a sudden increase in pressure, which can damage the walls, doors, windows, and ceilings of the room. To prevent this, pressure relief valves are required to vent the excess pressure to the outside and maintain a safe pressure level inside the room.
Pressure relief valves should be designed and installed in accordance with the relevant standards and codes, such as NFPA 2001 and ISO 14520.
References:
1: CDCP Preparation Guide, page 24, section 2.4.3 2: Data Center Fire Suppression Systems Bring Unexpected Risk3, page 1, section 1 4: Inergen from Fire Eater - CSC Datacenter5, page 1, section 1 6:
Inergen Fire Suppression System7, page 1, section 1
質問 # 17
Which type of Humidifier rapidly vibrates waster to create a fog or mist?
- A. Ultrasonic Humidifier
- B. Water Canister Humidifier
- C. Infrared Humidifier
- D. Steam Canister Humidifier
正解：A
解説：
An ultrasonic humidifier is a type of cool mist humidifier that uses a metallic diaphragm that vibrates at high frequencies to create water droplets that are added to the air. A fan projects these droplets into the air as mist, which then evaporates and humidifies the room. This type of humidifier rapidly vibrates the water to create a fog or mist.
References: EPI Data Centre Training Framework, How Humidifiers Can Help Allergies, Humidifier Buying Guide: Pros and Cons of Different Types.
質問 # 18
Which one of the following is a factor that can affect Availability and Reliability?
- A. Radio Active Waves
- B. Attenuation
- C. Inadequate Cooling
- D. Employee Salaries
正解：C
解説：
Availability and reliability are two important aspects of data centre performance that measure how often the system is operational and how dependable it is. According to the EPI Data Centre Framework, availability is the percentage of time that a system or component is in an operable state, while reliability is the probability that a system or component will perform its required function under given conditions for a specified period of time. Both availability and reliability can be affected by various factors, such as design, maintenance, human error, power supply, security, etc. One of the factors that can have a significant impact on both availability and reliability is cooling. Cooling is essential for maintaining the optimal temperature and humidity levels for the IT equipment and preventing overheating, which can cause failures, downtime, and reduced lifespan.
Inadequate cooling can result from insufficient capacity, poor airflow management, faulty components, or environmental conditions. Inadequate cooling can reduce the availability and reliability of the data centre by increasing the risk of thermal stress, hot spots, performance degradation, and equipment damage. Therefore, cooling is a critical factor that can affect availability and reliability in a data centre.
References:
*EPI Data Centre Framework1
*EPI Data Centre Training Framework2
*EPI Data Centre Competence Framework3
*Data Center Availability, Reliability Hinge On Numerous Factors4
*A Look at Data Center Reliability and Availability5
質問 # 19
What is the recommended location for the Isolation Transformer in relation to the ICT-Equipment location?
- A. The isolation transformer should be installed within the rack in which the ICT equipment has been installed.
- B. The isolation transformer should be as far away as possible to the ICT equipment to avoid potential EMF.
- C. The isolation transformer should be as close as possible to the ICT equipment but taking into account potential EMF.
- D. The isolation transformer has to be installed within the power entry point of the building due to electrical code (regulation) requirements.
正解：C
解説：
According to the EPI Data Centre Training Framework, an isolation transformer is a device that transfers electrical power from one circuit to another without changing the voltage or frequency, but providing galvanic isolation1. Galvanic isolation means that there is no direct electrical connection between the input and output circuits, which can prevent ground loops, reduce noise, and improve safety2. An isolation transformer can also provide voltage stepdown or stepup, create a local ground-bonded neutral, reduce harmonic currents, and provide taps for abnormal mains voltage3.
The location of the isolation transformer in relation to the ICT equipment depends on the purpose and design of the transformer. In general, the isolation transformer should be as close as possible to the ICT equipment, but taking into account potential EMF4. EMF is a form of electromagnetic interference (EMI) that can affect the performance and reliability of the ICT equipment5. The closer the isolation transformer is to the ICT equipment, the shorter the cable length and the lower the voltage drop and power loss4. However, the isolation transformer should also be far enough from the ICT equipment to avoid EMF, which can be reduced by using proper shielding, grounding, and spacing5.
The isolation transformer should not be installed as far away as possible to the ICT equipment, as option B suggests, because this would increase the cable length and the voltage drop and power loss4. The isolation transformer does not have to be installed within the power entry point of the building, as option C suggests, because this is not a requirement of the electrical code or regulation, and it may not be optimal for the data centre power system. The isolation transformer should not be installed within the rack in which the ICT equipment has been installed, as option D suggests, because this would increase the heat load and the noise level in the rack, and it may not fit in the rack space.
References: 1: EPI Data Centre Training Framework, Module 5: Power, Section 5.4.3: Isolation Transformers, Page 5-38 2: Guidelines for using isolation transformers in data center UPS systems - EEP1, Page 1 3: The Role of Isolation Transformers in Data Center UPS Systems2, Page 2 4: Data Center Transformer | Power Distribution - FGC Construction3, Page 1 5: EPI Data Centre Training Framework, Module 5: Power, Section
5.4.1: Electromagnetic Interference, Page 5-34 : Data centre transformers manufacturers - TMC Transformers4, Page 1 : The Role of Isolation Transformers in Data Center UPS Systems2, Page 25
質問 # 20
The UPS vendor is offering the latest model of their UPS to you. The vendor indicates that the UPS is categorized as VFD class.
Is this UPS a fit for your mission-critical data centre?
- A. Yes
- B. No
- C. Yes, but only if they install it with a 12-pulse rectifier.
- D. Yes, but only if you oversize the battery bank with 10%.
正解：B
解説：
A UPS (uninterruptible power supply) that is categorized as VFD class is not a fit for your mission-critical data centre, because it does not provide adequate protection against voltage and frequency variations. VFD stands for Voltage and Frequency Dependent, which means that the output voltage and frequency of the UPS depend on the input voltage and frequency. VFD UPSs are also known as offline, standby, or line-interactive UPSs. They typically switch to battery power only when the input power fails or goes beyond a certain threshold. However, this switching may cause a brief interruption or a transient in the output power, which can affect the performance and reliability of the ICT equipment. Moreover, VFD UPSs do not filter or regulate the input power, which means that they pass on any voltage or frequency fluctuations, harmonics, or noise to the output power. These power quality issues can also damage or degrade the ICT equipment and the data.
For your mission-critical data centre, you need a UPS that is categorized as VFI class, which stands for Voltage and Frequency Independent. VFI UPSs are also known as online, continuous, or double-conversion UPSs. They provide a constant and clean output power that is independent of the input power. VFI UPSs convert the input AC power to DC power, and then convert it back to AC power with the desired voltage and frequency. This double conversion process isolates the output power from the input power, and eliminates any power quality issues. VFI UPSs also have zero switching time, which means that they do not cause any interruption or transient in the output power when switching to battery power. VFI UPSs are designed to protect the ICT equipment and the data from any adverse effects of voltage and frequency variations, and to ensure the highest level of availability and reliability.
References:
1: CDCP Preparation Guide, page 17, section 2.3.1 2: Understanding UPS Classification: Fuji Electric's Technical Guide3, page 1, section 1 4: Uninterruptible Power Supplies Key Product Criteria5, page 1, section
1 6: UPS Function: Reduced Input Voltage for VFDs - KEB7, page 1, section 1
質問 # 21
What is the main difference between an Environmental Monitoring System (EMS) and a Building Management System (BMS)?
- A. A BMS is only able to monitor dry contacts (on/off). An EMS can also monitor analog values.
- B. An EMS monitors only. A BMS monitors and controls.
- C. An EMS provides local alarms. A BMS provides both local and remote alarms.
- D. A BMS only operates as a stand-alone system. An EMS can be configured as a redundant system.
正解：B
解説：
The main difference between an Environmental Monitoring System (EMS) and a Building Management System (BMS) is that an EMS monitors only, while a BMS monitors and controls. An EMS is a system that collects and records data from various sensors and devices that measure environmental parameters, such as temperature, humidity, air quality, power, and water. An EMS provides alerts and reports based on the data, but it does not control or adjust the environmental conditions. A BMS is a system that integrates and manages various building systems, such as HVAC, lighting, security, fire, and access. A BMS not only monitors the data from these systems, but also controls and optimizes them to achieve the desired performance and efficiency. A BMS can also communicate with an EMS to receive data and provide feedback.
References:
1: Environmental Monitoring Systems vs Building Management Systems2, page 1, section 1 3: Building Monitoring System vs Environmental Monitoring System4, page 1, section 1 5: BUILDING AND ENVIRONMENTAL MANAGEMENT SYSTEMS AND HOW THEY MEET GMP ...6, page 1, section 1 7:
Environmental Monitoring System vs. Building Management System8, page 1, section 1
質問 # 22
Which one of the following is a Natural Disaster?
- A. Grid Failure
- B. Hurricanes
- C. Blackouts
- D. Human Error
正解：B
解説：
According to the CDCP® Preparation Guide, a natural disaster is a catastrophic event that is caused by natural forces and has a significant impact on human lives, property, and environment. Hurricanes are examples of natural disasters, as they are powerful storms that form over warm ocean waters and produce strong winds, heavy rain, storm surges, and flooding. Grid failure, blackouts, and human error are not natural disasters, but rather man-made or technological disasters that result from failures or errors in human systems or activities.
References: CDCP® Preparation Guide, page 9. Natural Disaster Readiness for Data Centers. EM-DAT - The international disaster database. PDC Global - Pacific Disaster Center.
質問 # 23
is the degree to which a system or component is operational and accessibility when required for use.
- A. Reliability
- B. Agility
- C. Availability
- D. Scalability
正解：C
解説：
Availability is the degree to which a system, product or component is operational and accessible when required for use. It is one of the attributes of reliability, which is the ability of a system or component to perform its required functions under stated conditions for a specified period of time. Availability can be calculated as the ratio of the expected value of the uptime (the time when the system is functional) to the total time (uptime plus downtime) of a system or component. Availability can also be influenced by factors such as maintainability, fault tolerance, redundancy, diagnostics, and logistics.
References: EPI Data Centre Professional (CDCP®) Preparation Guide, page 8; Availability - Wikipedia; Reliability - ISO 25000.
質問 # 24
Which one of the following is the last stage in Stages of Combustion?
- A. Visible Smoke
- B. Incipient
- C. Intense Heat
- D. Flaming Fire
正解：D
解説：
The last stage in stages of combustion is flaming fire, which occurs when the fuel vapors and oxygen are mixed in the right proportion and ignited by a flame or a spark. Flaming fire is characterized by visible flames, intense heat, and rapid oxidation. Flaming fire can cause severe damage to the data center equipment, personnel, and business continuity. Therefore, it is important to prevent or suppress flaming fire as soon as possible using appropriate fire detection and suppression systems.
References:
*EPI Data Centre Professional (CDCP®) Preparation Guide, page 31
*[Fire Detection and Suppression Systems for Data Centers]
質問 # 25
Which type of copper wire is used for grounding the racks to the SRG?
- A. Thick copper cable to create better grounding.
- B. Copper cable with plastic insulation (isolation).
- C. Braided copper wire or flat copper strip.
- D. Thin copper cable to keep the cost low for grounding.
正解：C
解説：
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 sources234. 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.
References:
1: CDCP Preparation Guide, page 23, section 2.4.2 2: Signal Reference Grid | Enterprise Data Center Design and Methodology5, page 1, section 1 3: Grounding System Ground Rod Stacking Installation - Rain Bird6, page 1, section 1 4: SmartRack Copper Bus Grounding Bar - Eaton Website7, page 1, section 1
質問 # 26
Which of statements below is true?
- A. Single-mode cabling is more expensive than multi-mode cabling.
- B. Multi-mode cabling is more expensive than single-mode cabling.
- C. Multi-mode cabling can cross longer distances.
- D. Single-mode cabling can use both LED and laser as a light source.
正解：A
解説：
Single-mode cabling and multi-mode cabling are two types of fiber optic cables that differ in their core diameter, wavelength, light source, bandwidth, distance, and cost. Single-mode cabling has a smaller core diameter and uses a laser as a light source, which enables it to transmit data over longer distances and higher bandwidths. However, single-mode cabling is also more expensive than multi-mode cabling, because it requires more precise alignmentand splicing, and more costly light sources and connectors. Multi-mode cabling has a larger core diameter and uses LEDs or VCSELs as a light source, which makes it cheaper and easier to install and maintain. However, multi-mode cabling also has a shorter distance and lower bandwidth than single-mode cabling, because it suffers from more modal dispersion and attenuation.
References:
1: Data Center Cabling: Single Mode vs Multimode Fibers2, page 1, section 1 3: Single Mode vs Multimode Fiber Cable Guide4, page 1, section 1 5: Single-Mode vs. Multi-Mode Fiber Cables: Explained6, page 1, section 1 7: 2 Types of Fiber Optic Cable: Single Mode vs. Multimode Fiber8, page 1, section 1
質問 # 27
When dealing with glass door racks, cool air is injected into the rack from:
- A. The rear door in a downflow direction.
- B. The top of the rack through the fans and vents mounted inside the rack.
- C. The bottom of the rack.
- D. The front door in a downflow direction.
正解：A
解説：
Glass door racks are a type of rack that have solid glass front doors and rear door heat exchangers (RDHx).
RDHx are devices that use facility coolant to absorb heat from the exhaust air of the IT equipment and return cool air to the room. RDHx can be either passive or active, depending on the fan configuration. In general, IT hardware within the rack is air-cooled and the door heat exchanger uses facility coolant to absorb heat from exhaust air to return air to the facility at or near inlet air temperature to the rack. This rear door heat exchanger can either be a passive or active solution. When dealing with glass door racks, cool air is injected into the rack from the rear door in a downflow direction. This means that the cool air flows from the top to the bottom of the rack, following the natural convection of the hot air rising. This way, the cool air can reach all the IT equipment in the rack and prevent hot spots or overheating.
References: [SOLVED] Rack - Solid or Mesh front door? - Data Center
IT](https://community.spiceworks.com/topic/510677-rack-solid-or-mesh-front-door), ChilledDoor, Rear Door Heat Exchanger | Data Center Cooling, ACS Door Heat Exchanger Requirements for Open Rack.
質問 # 28
Which Class of Fires involves ordinary combustible materials such as paper, wood and cloth?
- A. Class K
- B. Class A
- C. Class B
- D. Class D
正解：B
解説：
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.
References: CDCP® Preparation Guide, page 30. Basics of Fire Protection in a Data Center. 3 Levels of Data Center Fire Protection Standards. Three Levels of Data Center Fire Protection.
質問 # 29
What are the four main components of a refrigeration circuit?
- A. Evaporation, membrane filter, monitor sensor, pressure valve
- B. Evaporator, compressor, condenser, expansion valve
- C. Condenser, expansion valve, buffer tank, de-icing unit
- D. Thermostat, monitoring interface, indoor unit, outdoor unit
正解：B
解説：
The four main components of a refrigeration circuit are the evaporator, the compressor, the condenser, and the expansion valve, according to the CDCP Preparation Guide1 and various web sources234. A refrigeration circuit is a system that transfers heat from a low-temperature region to a high-temperature region, using a working fluid called refrigerant. The refrigeration circuit operates in a closed loop, where the refrigerant changes its state from liquid to vapor and back to liquid, while absorbing and releasing heat. The four main components of the refrigeration circuit perform the following functions:
*The evaporator is a heat exchanger that absorbs heat from the low-temperature region, such as the data centre room, and transfers it to the refrigerant. The refrigerant enters the evaporator as a low-pressure, low-temperature liquid, and leaves the evaporator as a low-pressure, low-temperature vapor.
*The compressor is a mechanical device that increases the pressure and temperature of the refrigerant vapor.
The refrigerant enters the compressor as a low-pressure, low-temperature vapor, and leaves the compressor as a high-pressure, high-temperature vapor.
*The condenser is another heat exchanger that releases heat from the refrigerant to the high-temperature region, such as the outside air or water. The refrigerant enters the condenser as a high-pressure, high-temperature vapor, and leaves the condenser as a high-pressure, low-temperature liquid.
*The expansion valve is a device that reduces the pressure and temperature of the refrigerant liquid. The refrigerant enters the expansion valve as a high-pressure, low-temperature liquid, and leaves the expansion valve as a low-pressure, low-temperature liquid. The expansion valve also controls the flow of the refrigerant into the evaporator, depending on the cooling load.
References:
1: CDCP Preparation Guide, page 19, section 2.3.3 2: The Refrigeration Cycle5, page 1, section 1 3:
Fundamentals of Cooling in Data Center6, page 1, section 1 4: The Refrigeration System, Its Four Main Components, And Their Functions7, page 1, section 1
質問 # 30
Which type of Humidifier is composed of water-filled canister containing electrodes?
- A. Water Canister Humidifier
- B. Ultrasonic Humidifier
- C. Steam Canister Humidifier
- D. Infrared Humidifiers
正解：C
解説：
A steam canister humidifier is a type of humidifier that uses electricity to heat water in a canister containing electrodes. The water conductivity and the water level determine the amount of current and steam production.
The steam canister humidifier is also known as an electrode boiler humidifier or an electrode steam humidifier123.
References: 1: EPI Data Centre Professional (CDCP®) Reference Materials, page 192: Electrode and resistive type humidifiers compared | steamovap technologies inc3: Know-How | Electrode Steam Humidifier - Condair Group.
質問 # 31
......
CDCP試験の問題集簡単まとめ：https://jp.fast2test.com/CDCP-premium-file.html
リアルCDCPは100% カバー率リアル試験問題を使おう：https://drive.google.com/open?id=1ZC_JtS1BHeazcN6WLzJPhXGm0mQfYHJe