Pass Your EXIN CDCP Exam with Correct 73 Questions and Answers
Latest [Apr 08, 2024] 2024 Realistic Verified CDCP Dumps
NEW QUESTION # 37
Which one of the following is the last stage in Stages of Combustion?
- A. Visible Smoke
- B. Intense Heat
- C. Flaming Fire
- D. Incipient
Answer: C
Explanation:
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]
NEW QUESTION # 38
What is the main advantage of busbar trunking compared to stand electrical cabling?
- A. Busbar trunking is less expensive.
- B. Busbar trunking allows for flexibility.
- C. Busbar trunking can be located both overhead and under the raised floor.
- D. Busbar trunking has a fixed power rating.
Answer: B
Explanation:
Busbar trunking systems are a method of power distribution using rigid copper or aluminium conductors to distribute the power around a building. Busbar trunking systems have many advantages over cables, such as lower space requirements, higher short-circuit strength, lower fire load, and easier installation. One of the main advantages of busbar trunking is that it allows for flexibility in terms of power transmission and distribution.
Busbar trunking systems can be easily relocated, modified, or expanded to accommodate changes in the building layout or load demand. Busbar trunking systems can also be fitted with various components, such as tap-off units, elbows, tees, and end feed units, to provide power to different locations and consumers. Busbar trunking systems can also be installed both overhead and under the raised floor, depending on the design and preference of the building.
References: Why I prefer busbar trunking systems more than cables | EEP, Why should you choose Busbar over Cable? - E+I Eng, Busbar VS Cables for Riser Applications - An Electrical Engineer.
NEW QUESTION # 39
What is the current recommended temperature for ICT equipment as described in the ASHREA TC 9.9 guideline?
- A. 8-18 C (46.4 -64.4 °F)
- B. 25-45 °C (77 - 113 °F)
- C. 20-40 °C (68 - 104 °F)
- D. 18-27 C (64.4 - 80.6°F)
Answer: D
Explanation:
The current recommended temperature for ICT equipment as described in the ASHRAE TC 9.9 guideline is
18-27 C (64.4 - 80.6°F). This is the recommended range for the dry-bulb temperature at the inlet of the servers, which is the most critical parameter for ensuring the optimal performance and reliability of the ICT equipment. The recommended range is based on the thermal specifications of the majority of the ICT equipment in the market, as well as the energy efficiency and environmental considerations of the data centre cooling systems. The recommended range is suitable for Classes A1 to A4 of the ASHRAE thermal guideline classes, which cover different types and generations of ICT equipment.
References:
1: 2021 Equipment Thermal Guidelines for Data Processing Environments - ASHRAE2, page 1, Table 2.1 3:
ASHRAE TC9.9 Data Center Power Equipment Thermal Guidelines and Best Practices4, page 10, section 2.1
5: Does your Data Center Follow ASHRAE TC 9.9 Thermal Guidelines for Data Processing Environments?6, page 1, section 1
NEW QUESTION # 40
When dealing with glass door racks, cool air is injected into the rack from:
- A. The top of the rack through the fans and vents mounted inside the rack.
- B. The front door in a downflow direction.
- C. The bottom of the rack.
- D. The rear door in a downflow direction.
Answer: D
Explanation:
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.
NEW QUESTION # 41
Does shielded twisted pair network cabling provide protection against EMF from power cables?
- A. Yes, as the shielding for twisted pair network cabling is specifically design for low frequency EMF protection.
- B. Yes, but only if the power cable is placed in a tre-foil cable arrangement.
- C. No, the shielding for twisted pair network cabling is for physical protection against vandalism and accidental cutting of the cable.
- D. No, the shielding is designed for alien cross-talk between network cables, it provides no or little protection against low frequency EMF.
Answer: D
Explanation:
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.
NEW QUESTION # 42
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. Thin copper cable to keep the cost low for grounding.
- D. Braided copper wire or flat copper strip.
Answer: D
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 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
NEW QUESTION # 43
Does unplanned downtime of a data centre have an impact on the business results?
- A. No, unplanned data centre downtime is already financially planned for in the yearly budget planning process.
- B. Yes, data centre downtime can result in business downtime.
- C. Yes, but data centre downtime only impacts the airline industry.
- D. No, because data centres operate independently from the business.
Answer: B
Explanation:
Data centres are essential for supporting the IT operations and applications of various businesses across different industries. Data centre downtime can have a negative impact on the business results, such as loss of revenue, customer satisfaction, productivity, reputation, and competitive advantage. According to a web search, the average cost of data centre downtime in 2020 was $8,851 per minute, and the average duration of a data centre outage was 95 minutes1. This means that a typical data centre outage could cost a business over
$840,000 in direct and indirect losses1. Therefore, data centre downtime can have a significant impact on the business results, regardless of the industry or sector.
References: Unplanned Downtime Costs More Than You Think, Downtime, Outages and Failures - Understanding Their True Costs, The Unplanned Downtime Nightmare - And How Operators Can Avoid
NEW QUESTION # 44
A fire extinguisher in the data centre is found which is classed as ABC.
Is this suitable?
- A. Depends on the brand
- B. Yes
- C. Only for fires not related to electrical power
- D. No
Answer: D
Explanation:
A fire extinguisher in the data centre that is classed as ABC is not suitable, because it contains dry chemical powder that can damage the ICT equipment and the data. ABC fire extinguishers are designed to fight Class A, B, and C fires, which are fueled by combustible materials, flammable liquids or gases, and electrical equipment, respectively. However, the dry chemical powder can leave a corrosive residue on the ICT equipment, which can cause short circuits, data loss, or malfunction. Moreover, the dry chemical powder can be difficult to clean, especially from the small spaces and crevices of the ICT equipment. Therefore, ABC fire extinguishers are not recommended for data centres, and should be replaced with more suitable fire extinguishers, such as clean agent fire extinguishers, which use gas or liquid that does not leave any residue or harm the ICT equipment.
References:
1: CDCP Preparation Guide, page 24, section 2.4.3 2: Data Center Fire Suppression: Overview & Protection Guide3, page 1, section 1 4: Fire Extinguisher Classes and Suitability5, page 1, section 1 6: SAFETY DATA SHEET Commercial ABC Dry Chemical (Fire Extinguishing Agent ...7, page 1,
NEW QUESTION # 45
What factor should be considered when placing fluorescent lighting in the data centre?
- A. Fluorescent lights should not be connected to the back-up generator.
- B. Fluorescent lights should only be installed in equipment supporting areas and not in the Computer/Server room.
- C. Fluorescent lights should not be connected to the mains power supply.
- D. Fluorescent lights should not be connected to the same UPS that supports the ICT equipment.
Answer: D
Explanation:
The UPS (uninterruptible power supply) is a device that provides backup power to the ICT equipment in case of a power outage or a power quality issue. The UPS should be dedicated to the ICT equipment only, and not to other loads, such as lighting, cooling, or security systems. This is because connecting fluorescent lights to the same UPS as the ICT equipment can cause several problems, such as:
*Reducing the battery runtime of the UPS, which may not be enough to support the ICT equipment until the backup generator kicks in or the utility power is restored.
*Increasing the harmonic distortion of the UPS output, which can affect the performance and reliability of the ICT equipment and the UPS itself.
*Creating electromagnetic interference (EMI) or radio frequency interference (RFI), which can disrupt the communication and data transmission of the ICT equipment.
*Triggering false alarms or tripping the circuit breakers of the UPS, which can cause downtime or data loss.
Therefore, fluorescent lights should not be connected to the same UPS that supports the ICT equipment.
Instead, they should be connected to a separate power source, such as the utility power, the backup generator, or a different UPS.
References:
1: CDCP Preparation Guide, page 17, section 2.3.1 2: Data Center Lighting Design Considerations3, page 1, section 3 4: Data Center Lighting Solutions5, page 1, section 1 6: Going beyond energy savings in data centers with LEDs7, page 1, section 2
NEW QUESTION # 46
Do I need to check the local standards if I already comply to international standards?
- A. Compliance to only international standards is good enough as most local standards are derived from international standards.
- B. Data centres only need to comply to international standards since they are connected to a worldwide international network infrastructure.
- C. Local standards do not to be checked as some countries have too many local standards, which will slow down the data centre construction.
- D. You need to check the local standards to ensure compliance to these standards.
Answer: D
Explanation:
Data centre design and infrastructure standards can vary from country to country, depending on the local regulations, codes, and practices. Therefore, it is important to check the local standards before designing, building, or operating a data centre in a specific location. Compliance to only international standards may not be sufficient or adequate to meet the local requirements, which could result in legal, financial, or operational risks. For example, some countries may have stricter fire safety, environmental, or energy efficiency standards than the international ones. Some countries may also have different electrical standards, such as voltage, frequency, or plug types. By checking the local standards, you can ensure that your data centre is compliant, safe, and efficient in the local context.
References:
1: Data Center Design: Which Standards to Follow?2, page 1, section 1 3: The Most Important Data Center Design and Infrastructure Codes and Standards4, page 1, section 1 5: Explaining the new family of ISO Data Centre Standards6, page 1, section 1 7: Standards for data centre certification. Is a changing coming?8, page 1, section 1
NEW QUESTION # 47
Which one of the following is a Natural Disaster?
- A. Hurricanes
- B. Human Error
- C. Grid Failure
- D. Blackouts
Answer: A
Explanation:
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.
NEW QUESTION # 48
Sprinkler heads used in computer rooms activate at what temperature?
- A. 70 C (158 °F)
- B. 57 °C (135 °F)
- C. Only on direct contact with a flame
- D. 27 °C (81 °F)
Answer: B
Explanation:
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
NEW QUESTION # 49
Which one of the following is a device that uses circulating chilled water to remove heat?
- A. Computer Room Air Suppression Unit (CRAS)
- B. Computer Room Air System Unit (CRAS)
- C. Computer Room Air Suspension Unit (CRAS)
- D. Computer Room Air Handling Unit (CRAH)
Answer: D
Explanation:
A computer room air handling unit (CRAH) is a device that uses circulating chilled water to remove heat from the data center environment. A CRAH consists of a fan, a coil, and a filter. The fan draws the warm air from the data center and passes it through the coil, where the heat is transferred to the chilled water. The chilled water is supplied by a chiller or a cooling tower, and the cooled air is returned to the data center. A CRAH is different from a computer room air conditioning unit (CRAC), which uses a refrigerant instead of chilled water to cool the air.
References:
*EPI Data Centre Professional (CDCP®) Preparation Guide, page 36
*Chilled Water Systems: Applications and Common Uses
*The Principles of Basic Refrigeration: What is a chiller?
NEW QUESTION # 50
What is the main difference between an Environmental Monitoring System (EMS) and a Building Management System (BMS)?
- A. A BMS only operates as a stand-alone system. An EMS can be configured as a redundant system.
- 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 is only able to monitor dry contacts (on/off). An EMS can also monitor analog values.
Answer: B
Explanation:
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
NEW QUESTION # 51
Which Class of Fire involves combustible metals or combustible metal alloys such as magnesium, sodium and potassium?
- A. Class C
- B. Class A
- C. Class B
- D. Class D
Answer: D
Explanation:
Class D fires involve combustible metals or combustible metal alloys such as magnesium, sodium and potassium. These metals can react violently with water, air, or other chemicals, and require special extinguishing agents1 References: 1: EPI Data Centre Professional (CDCP®) Reference Materials, page 16.
NEW QUESTION # 52
Which source is used in fiber cable to transmit data?
- A. Pulse
- B. Light
- C. Signals
- D. Electric
Answer: B
Explanation:
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
NEW QUESTION # 53
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