[2024年更新]合格できるEXIN CDCPプレミアム資料テストエンジンPDFの無料問題集お試しセット [Q21-Q37]

[2024年更新]合格できるEXIN CDCPプレミアム資料テストエンジンPDFの無料問題集お試しセット

2024年最新のリアルCDCP問題集テストエンジン試験問題はここにある

質問 # 21
When having two non-synchronized power sources, the ATS / STS need to be of the type:

A. Make before break.
B. Break before make.
C. Both make before break or break before make can be used.
D. Both an ATS and STS can never handle two non-synchronized sources.

正解：B

解説：
When having two non-synchronized power sources, the ATS / STS need to be of the type break before make, which means that the switch disconnects from one source before connecting to the other source. This prevents any short circuit, back feed, or phase mismatch that could occur if the two sources were connected simultaneously. Break before make switches are also known as open transition switches, because they create a brief interruption in the power supply during the switching process. This interruption is usually acceptable for most ICT equipment, as they have internal power supplies or batteries that can handle the transient. However, if the interruption is not acceptable, then the two power sources need to be synchronized before switching, which requires a make before break switch, also known as a closed transition switch. Make before break switches connect to the second source before disconnecting from the first source, which ensures a seamless transfer of power without any interruption. However, make before break switches require that the two sources have the same voltage, frequency, and phase, which can be achieved by using a synchronization module or a phase-locked loop.
References:
1: CDCP Preparation Guide, page 17, section 2.3.1 2: STS in data centres - Borri3, page 1, section 1 4: Using Static Transfer Switches to Enhance Data Center ... - Donwil5, page 1, section 1 6: What is an Automatic Transfer Switch (Power)? | Ethan Banks7, page 1, section 1

質問 # 22
Which Class of Fires involves energized electrical equipment?

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

正解：D

解説：
Class C fires involve energized electrical equipment, such as computers, servers, switches, cables, and wiring.
These fires require the use of non-conductive extinguishing agents, such as carbon dioxide, dry chemical, or clean agent, to prevent electrical shock and damage to the equipment. Water-based extinguishers, such as Class A or K, are not suitable for Class C fires, as water can conduct electricity and cause electrocution or short circuits.
References: EPI Data Centre Training Framework, CDCP Preparation Guide, ABCs of Fire Extinguishers

質問 # 23
Which design consideration should be implemented with an Inergen-based fire suppression system?

A. To use Inergen only for fires which are not related to electrical power.
B. Install the gas containers (tanks) close to the data centre.
C. Pressure relief valves are required in the room that needs protection.
D. Install protective covers around the nozzles to avoid accidental gas dumps.

正解：C

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 # 24
Sprinkler heads used in computer rooms activate at what temperature?

A. 70 C (158 °F)
B. 27 °C (81 °F)
C. 57 °C (135 °F)
D. Only on direct contact with a flame

正解：C

解説：
Sprinkler heads used in computer rooms activate at 57 °C (135 °F), which is the standard temperature rating for ordinary sprinklers. This is the temperature at which the heat-sensitive element of the sprinkler head, such as a glass bulb or a fusible link, breaks or melts, allowing water to flow from the sprinkler. Sprinkler heads are designed to activate only when exposed to a fire, not to ambient temperature fluctuations. Therefore, sprinkler heads should be installed at a sufficient distance from the heat sources, such as servers, racks, or ducts, to avoid accidental activation. Sprinkler heads should also be selected and installed in accordance with the relevant standards and codes, such as NFPA 13 and NFPA 75.
References:
1: CDCP Preparation Guide, page 24, section 2.4.3 2: Sprinkler Systems in Data Centers3, page 1, section 1 4:
Data Center Fire Protection5, page 1, section 2 6: Data Center Sprinkler System Design7, page 1, section 1

質問 # 25
Which of statements below is true?

A. Multi-mode cabling can cross longer distances.
B. Single-mode cabling can use both LED and laser as a light source.
C. Multi-mode cabling is more expensive than single-mode cabling.
D. Single-mode cabling is more expensive than multi-mode cabling.

正解：D

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 # 26
An optical fiber cable comes with the specifications 50/125 um.
What do the numbers represent?

A. The first number represents the required distance to single-phase power cabling; the second number represents the required distance to three-phase cabling.
B. The first number represents the diameter of the core; the second number represents the actual diameter cable including the buffer and jacket.
C. The first number represents the diameter of the core; the second number represents the diameter of the cladding in microns.
D. The first number represents the distance for a 10 Gb/s connection; the second number represents the distance for a 1 Gb/s connection.

正解：C

解説：
Optical fiber cables are composed of a core, a cladding, and a coating. The core is the central part of the fiber that carries the light signal. The cladding is the layer surrounding the core that reflects the light back into the core and prevents signal loss. The coating is the protective layer that covers the cladding and provides mechanical strength and environmental protection. The specifications of an optical fiber cable indicate the dimensions of the core and the cladding in microns (m), which are one millionth of a meter. For example, a
50/125 m cable has a core diameter of 50 m and a cladding diameter of 125 m. The coating diameter is usually
250 m, but it is not part of the specifications.
References: Multimode Optical Fiber Selection & Specification - Corning, Optical Fiber OM3 (50/125µm Multimode Fiber), 50/125 Graded-Index OM2 Optical Fiber - OFS

質問 # 27
Which one of the following is an example of Indirect Cost?

A. Cost revenues
B. Damaged brand perception
C. System recovery
D. Legal fees

正解：B

解説：
Damaged brand perception is an example of an indirect cost because it is not directly related to a specific product or service, but rather to the overall reputation and image of the company. Damaged brand perception can result from various factors, such as poor quality, customer dissatisfaction, security breaches, or negative publicity. Damaged brandperception can affect the company's ability to attract and retain customers, partners, and investors, and thus reduce its profitability and competitiveness.
References: EPI Data Centre Training Framework, Indirect Cost: Definition and Example, What Is Indirect Cost? Definition, Types and Examples.
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質問 # 28
What is the main risk for a data centre when the water supply fails?

A. Failure to the water supply could result in sudden changes of the relative humidity in the Computer room.
B. Failure to the water supply could result in IT failure and/or denial of access to operate.
C. Failure to the water supply could cause issues for the cooling of back-up generators.
D. Failure to the water supply could result in DX cooling systems to fail.

正解：C

解説：
Back-up generators are essential for providing power to the data centre in case of a utility outage. However, back-up generators also generate a lot of heat, which needs to be dissipated by a cooling system. The cooling system may rely on water supply, either from the municipal network or from a dedicated tank. If the water supply fails, the cooling system may not function properly, leading to overheating and potential damage to the generators. This could compromise the reliability and availability of the data centre power supply and cause downtime or data loss.
References:
1: CDCP Preparation Guide, page 18, section 2.3.2 2: Data Center Generator Cooling Systems3, page 1, section 1 4: Data Center Cooling Systems5, page 1, section 1

質問 # 29
What should be a consideration when having casters (rollers/wheels) or feet under the rack?

A. The casters and feet should be larger to avoid a too heavy point load on the floor tile.
B. Casters and feet should not be locked to ensure the racks are still able to be moved to another position.
C. Casters and feet should be of a soft material, for example rubber, to avoid damage to the raised floor tile.
D. Skirts at the bottom of the rack to avoid air flow between the hot and cold aisles.

正解：A

解説：
The casters and feet under the rack are used to support the weight of the rack and its equipment, and to allow the rack to be moved if needed. However, the casters and feet should also be designed to avoid putting too much pressure on the floor tile, especially if the data centre uses a raised floor system. A too heavy point load on the floor tile can cause the tile to crack, deform, or collapse, which can damage the rack, the equipment, and the underlying infrastructure. To prevent this, the casters and feet should be larger, so that they can distribute the weight over a larger area and reduce the point load. The casters and feet should also be compatible with the floor type and the load rating of the floor tile.
References:
1: CDCP Preparation Guide, page 22, section 2.4.1.1 2: Raised Floor Design Considerations for Data Center3, page 1, section 1 4: [SOLVED] server rack on casters or feet5, page 1, section 1

質問 # 30
Which one of the following is a core objective of a Business Value in an organization?

A. Increasing Sales
B. None of the above
C. Reducing the Deficit
D. Reducing Costs

正解：B

解説：
According to the EPI Data Centre Professional (CDCP®) Reference Materials, a core objective of a Business Value in an organization is to create value for customers and stakeholders1. This means delivering products or services that meet or exceed customer expectations, while also generating profits or benefits for the organization and its shareholders. Reducing costs, reducing the deficit, and increasing sales are possible ways to achieve this objective, but they are not the core objective itself.
References: 1: EPI Data Centre Professional (CDCP®) Reference Materials, page 9.

質問 # 31
By what are magnetic fields of the type 'H' or 'B' created?

A. Magnetic fields are created when there is a high level of common mode noise (CMN); the greater the common mode noise (CMN), the stronger the magnetic field.
B. Magnetic fields are created by voltage; the greater the voltage, the stronger the magnetic field.
C. Magnetic fields are created by the magnetic flux of the earth which varies per month.
D. Magnetic fields are created when an electric current flows; the greater the current, the stronger the magnetic field.

正解：D

解説：
According to the CDCP Preparation Guide1, magnetic fields of the type 'H' or 'B' are created when an electric current flows through a conductor, such as a wire or a coil. The magnetic field strength 'H' is proportional to the current 'I' and the number of turns 'N' of the coil, and inversely proportional to the length
'l' of the coil. The magnetic flux density 'B' is proportional to the magnetic field strength 'H' and the permeability '' of the medium in which the magnetic field exists. The greater the current, the stronger the magnetic field and the magnetic flux density. The relationship between 'H', 'B', 'I', 'N', 'l', and '' can be expressed by the following equations:
H = N I / l
B =H
References:
1: CDCP Preparation Guide, page 23, section 2.4.2.1 2: Difference between B and H in magnetic fields?3, page 1, section 1 4: Magnetic field | Definition & Facts5, page 1, section 1

質問 # 32
Which source is used in fiber cable to transmit data?

A. Light
B. Electric
C. Pulse
D. Signals

正解：A

解説：
Fiber-optic cables use light as the source to transmit data. Light pulses are modulated to carry information through an optical fiber. The light is confined in the core of the fiber by total internal reflection at the core-cladding interface. The light travels along the fiber with minimal loss or interference, making it suitable for long-distance and high-bandwidth applications.
References: EPI Data Centre Training Framework, Principle of Data transmission through fiber optic cables, Fiber-optic communication

質問 # 33
What is a requirement for both CCTV cameras and recording equipment?

A. CCTV cameras can only be used to cover the outside of the building, where as the recording equipment needs to be located in a secure area.
B. Both must be connected to a UPS.
C. Both must be placed inside the Computer room.
D. They must be of the same brand.

正解：B

解説：
A UPS (Uninterruptible Power Supply) is a device that provides backup power to electrical equipment in case of a power outage or fluctuation. A UPS is essential for both CCTV cameras and recording equipment, as it ensures that the surveillance system can continue to operate and record without interruption or data loss. A UPS can also protect the CCTV cameras and recording equipment from damage caused by power surges or spikes. Connecting both CCTV cameras and recording equipment to a UPS is a requirement for data centres, as it enhances the security and reliability of the surveillance system.
References: Technical Specification - GeM, [What is a UPS? | Uninterruptible Power Supply | APC by Schneider Electric], [Why You Need a UPS for Your CCTV System - CCTV Camera World].

質問 # 34
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. A BMS only operates as a stand-alone system. An EMS can be configured as a redundant system.
D. An EMS provides local alarms. A BMS provides both local and remote alarms.

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 # 35
What is the minimum clearance space required below water sprinkler heads and nozzles of gas-based fire suppression systems?

A. 64 cm / 25 inches
B. 60 cm / 24 inches
C. 120 cm / 47 inches
D. 46 cm / 18 inches

正解：D

解説：
The minimum clearance space required below water sprinkler heads and nozzles of gas-based fire suppression systems is 46 cm / 18 inches, according to the CDCP Preparation Guide1 and OSHA regulation 29 CFR
1910.159 © (10)2. This clearance space is necessary to ensure that the sprinkler spray or gas discharge can reach the fire and cover the protected area effectively. Any material or obstruction below this clearance space can interfere with the sprinkler or gas distribution and reduce the fire suppression performance. Therefore, building owners and managers should ensure that all storage and objects in the data centre are kept below this clearance space, and that the clearance space is maintained at all times.
References:
1: CDCP Preparation Guide, page 24, section 2.4.3 2: Clarification of OSHA regulation 29 CFR
1910.159©(10), Sprinkler ...3, page 1, section 1

質問 # 36
Which one of the following is an example of Direct Cost?

A. Negative public relations
B. Legal fees
C. Damaged brand perception
D. Reduced customer satisfaction

正解：B

解説：
Legal fees are an example of direct cost because they can be directly attributed to a specific project, product, or service. Legal fees are incurred for the purpose of obtaining legal advice, drafting contracts, resolving disputes, or complying with regulations related to the core business activity. Legal fees are not general overhead expenses that are shared by multiple cost objects.
References: EPI Data Centre Training Framework, CDCP Preparation Guide, Direct Cost - Overview, Examples, Tax Implications

質問 # 37
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