[Q34-Q50] Free CDCP Exam Files Downloaded Instantly UPDATED [2025]

Free CDCP Exam Files Downloaded Instantly UPDATED [2025]

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NEW QUESTION # 34
What factor should be considered when placing fluorescent lighting in the data centre?

• A. Fluorescent lights should only be installed in equipment supporting areas and not in the Computer
  /Server room.
• B. Fluorescent lights should not be connected to the same UPS that supports the ICT equipment.
• C. Fluorescent lights should not be connected to the mains power supply.
• D. Fluorescent lights should not be connected to the back-up generator.

Answer: B

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 # 35
By what are magnetic fields of the type 'H' or 'B' created?

• A. Magnetic fields are created by voltage; the greater the voltage, the stronger the magnetic field.
• B. 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.
• 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.

Answer: D

Explanation:
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

NEW QUESTION # 36
When dealing with glass door racks, cool air is injected into the rack from:

• A. The front door in a downflow direction.
• B. The bottom of the rack.
• C. The top of the rack through the fans and vents mounted inside 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 # 37
What is the most preferred unit of measure for cooling capacity?

• A. Watt
• B. Ton
• C. Horsepower
• D. BTU

Answer: A

Explanation:
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

NEW QUESTION # 38
What should be considered when using a direct air handler for a data centre?

• A. Cost of operation as power consumption on these units tend to be higher compared to traditional air conditioning technology.
• B. The availability of three-phase power due to the high power requirements of these air handler units.
• C. Temperature, humidity and contamination of the outdoor environment.
• D. Space available inside the computer rooms as the air handler space requirement for the inside the Computer room is quite large.

Answer: C

Explanation:
Direct air handlers are a type of cooling system that use outdoor air to cool the data centre. They draw in fresh air from outside, filter it, and supply it to the data centre at the desired temperature and humidity level. Direct air handlers can reduce the energy consumption and operating costs of data centres by eliminating the need for mechanical cooling or refrigeration. However, they also have some challenges and limitations that need to be considered. One of the main factors to consider when using direct air handlers for data centres is the temperature, humidity and contamination of the outdoor environment. Depending on the location and climate of the data centre, the outdoor air may not always be suitable for cooling the data centre. For example, if the outdoor air is too hot, too humid, or too polluted, it may not provide enough cooling capacity, or it may damage the IT equipment or cause corrosion. Therefore, direct air handlers need to have sensors and controls to monitor the outdoor air quality and adjust the airflow accordingly. They may also need to have backup cooling systems or supplementary cooling devices, such as evaporative coolers or heat exchangers, to cope with extreme weather conditions or peak loads.
References: Data Center Cooling: A Comprehensive Guide - Dgtl Infra, Carrier Data Center Cooling System
39DC, Dublin Data Center: Rooftop Air Handlers.

NEW QUESTION # 39
Which type of copper wire is used for grounding the racks to the SRG?

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

Answer: B

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 # 40
Looking from within the Computer room, what should the door-swing (opening) direction be?

• A. Inwards, code permitted
• B. Depends on the type of Computer room
• C. Outwards, code permitted
• D. Instead of swinging doors, sliding doors are preferred

Answer: C

Explanation:
For safety and emergency egress, doors should swing outwards (towards the exit). This is a common building code and best practice in data centers.
References:
CDCP Exam Preparation Guide, Security and Safety

NEW QUESTION # 41
Does shielded twisted pair network cabling provide protection against EMF from power cables?

• A. No, the shielding is designed for alien cross-talk between network cables, it provides no or little protection against low frequency EMF.
• B. No, the shielding for twisted pair network cabling is for physical protection against vandalism and accidental cutting of the cable.
• C. Yes, but only if the power cable is placed in a tre-foil cable arrangement.
• D. Yes, as the shielding for twisted pair network cabling is specifically design for low frequency EMF protection.

Answer: A

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
What is the recommended location for the Isolation Transformer in relation to the ICT-Equipment location?

• A. The isolation transformer has to be installed within the power entry point of the building due to electrical code (regulation) requirements.
• 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 should be installed within the rack in which the ICT equipment has been installed.

Answer: C

Explanation:
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

NEW QUESTION # 43
The termination of the ability of a product to perform its required function can be defined as.

• A. Failure
• B. Termination
• C. Hindrance
• D. Obstacle

Answer: A

Explanation:
According to the EPI Data Centre Professional (CDCP) Preparation Guide, failure is defined as "the termination of the ability of a product to perform its required function" (page 9). Failure can occur due to various reasons, such as wear and tear, design flaws, human errors, environmental factors, or external events.
Failure can affect the availability, reliability, and performance of a product, system, or service.
References:
*EPI Data Centre Professional (CDCP) Preparation Guide, page 9
*What is Failure? | Definition from WhatIs.com

NEW QUESTION # 44
Mean time between failures is best considered a measure of:

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

Answer: C

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.
References: EPI Data Centre Training Framework, CDCP Preparation Guide, Reliability Metrics 101: Mean Time Between Failure (MTBF)

NEW QUESTION # 45
What is the main advantage of busbar trunking compared to stand electrical cabling?

• A. Busbar trunking allows for flexibility.
• B. Busbar trunking can be located both overhead and under the raised floor.
• C. Busbar trunking is less expensive.
• D. Busbar trunking has a fixed power rating.

Answer: A

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 # 46
What is the primary reason to install a monitoring system in the data centre?

• A. To implement automated change management
• B. To notice abnormalities early so that actions can be taken to avoid disasters
• C. To be able to collect data for capacity planning
• D. To create a proper asset database

Answer: B

Explanation:
The primary reason to install a monitoring system in the data centre is to notice abnormalities early so that actions can be taken to avoid disasters, according to the CDCP Preparation Guide1 and various web sources234. A monitoring system is a system that collects and analyzes data about the power, cooling, environmental, and security conditions in the data centre, and alerts the operators or managers about any issues or threats that may affect the performance, availability, or reliability of the data centre. A monitoring system can help to prevent or minimize the impact of disasters, such as power outages, fire, water damage, overheating, equipment failure, or cyberattacks, by providing timely and accurate information that enables fast and corrective action. A monitoring system can also help to improve the energy efficiency, capacity planning, and asset management of the data centre, by providing useful insights and trends that support informed decision making.
References:
1: CDCP Preparation Guide, page 21, section 2.3.5 2: Improving Data Center Management and Monitoring5, page 1, section 1 3: Guide to Data Center Monitoring6, page 1, section 1 4: Why Data Center Monitoring is Essential7, page 1, section 1

NEW QUESTION # 47
Which Class of Fires involves energized electrical equipment?

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

Answer: C

Explanation:
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

NEW QUESTION # 48
Which one of the following is an Audible Signaling and Notification Device?

• A. Alarms
• B. Strobes
• C. Clocks
• D. Sirens

Answer: D

Explanation:
According to the CDCP® Preparation Guide, an audible signaling and notification device is a device that produces a sound to alert or notify the occupants of a data center of an event or condition. Sirens are examples of such devices, as they can emit loud and distinctive tones to warn of fire, emergency, or security incidents.
Strobes, on the other hand, are visual signaling and notification devices that produce flashes of light to attract attention or convey information. Alarms and clocks are not specific types of devices, but rather general terms that can refer to various audible or visual devices.
References: CDCP® Preparation Guide, page 30. Audible Visual Notification | System Sensor | Honeywell.
Audible-Visual Signaling Devices - AutomationDirect.

NEW QUESTION # 49
Which Class of Fire involves combustible metals or combustible metal alloys such as magnesium, sodium and potassium?

• A. Class B
• B. Class C
• C. Class D
• D. Class A

Answer: C

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 # 50
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