CDCP的中率 & CDCP合格体験記
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EXIN CDCP 認定試験の出題範囲：
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素敵-正確的なCDCP的中率試験-試験の準備方法CDCP合格体験記
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EXIN Certified Data Centre Professional (CDCP) 認定 CDCP 試験問題 (Q25-Q30):
質問 # 25
Which Class of Fires involves ordinary combustible materials such as paper, wood and cloth?
正解：A
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 # 26
Does shielded twisted pair network cabling provide protection against EMF from power cables?
正解：C
解説：
Shielded twisted pair cables (STP) are Ethernet cables that feature additional protection against electromagnetic interference from external sources, such as radio waves, microwaves, or other network cables.
This is achieved by wrapping each pair of wires with a conductive shield, usually made of foil or braided wire, and then enclosing the entire cable with another shield layer. However, this shielding is not effective against low frequency electromagnetic fields (EMF) from power cables, which can induce currents and voltages in the network cables and cause signal distortion or data loss. Low frequency EMF can only be reduced by increasing the distance between the power and network cables, or by using a tre-foil cable arrangement, which is a special configuration of three power cables twisted together to cancel out the magnetic fields they generate.
References: STP Cable: Your Shield Against Network Disturbances; What is Shielded Twisted Pair Cable? - Advantages, Disadvantages; Shielded vs. Unshielded Cables: What's the Difference? - Cable Matters.
質問 # 27
Which source is used in fiber cable to transmit data?
正解：B
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 # 28
What is the main difference between an Environmental Monitoring System (EMS) and a Building Management System (BMS)?
正解：D
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 # 29
What is the most preferred unit of measure for cooling capacity?
正解：B
解説：
Cooling capacity is the measure of a cooling system's ability to remove heat from a space. The most preferred unit of measure for cooling capacity is watt (W), which is the SI unit for power. Watt is defined as the amount of energy transferred or converted per unit time. One watt is equal to one joule of energy per second. Using watt as the unit of measure for cooling capacity allows for easy comparison and calculation of the cooling performance and efficiency of different cooling systems.
Other units of measure for cooling capacity are ton, BTU, and horsepower, but they are less common and less convenient than watt. Ton is a unit of measure that describes how much water at freezing temperature can be frozen in 24 hours, equivalent to 3.5 kW or 12,000 BTU/h. BTU (British Thermal Unit) is a unit of measure that describes the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit, equivalent to 0.293 W. Horsepower is a unit of measure that describes the rate at which work is done, equivalent to 746 W.
References:
*Data Centre Professional (CDCP) Reference Materials, page 8, section 2.1.1
*Data Centre Professional (CDCP) Preparation Guide, page 11, section 2.1.1
*Cooling capacity - Wikipedia
*Air Conditioner BTU Calculator
*Air conditioning 101: Basics, working principle and sizing ... - GlobalSpec
*How is cooling capacity measured? - Sage-Advices
*Everything You Need to Know About Cooling Capacity
質問 # 30
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