Exin CDCP Exam Practice Test Instant Access

Question 1

What is the purpose of a service corridor?

ATo create a secure and conditioned environment where media can be stored in a controlled manner.

BIt is a generic name for pathways leading to other rooms that contains facility supporting equipment like the UPS room, battery room, generator room etc.

CIt provides a safe, vented and secure area where standby generators can operate safely.

DIt provides a secure area where supporting facilities can be serviced and monitored on a 24x7 basis without disturbing the computer room.

Answer : D

A service corridor is a dedicated space within or adjacent to a data centre that allows access to the supporting facilities, such as power, cooling, fire suppression, security, and cabling systems, without interfering with the computer room operations. A service corridor helps to isolate the noise, vibration, heat, and dust generated by the supporting facilities from the sensitive equipment in the computer room. A service corridor also enhances the safety and efficiency of the maintenance and monitoring activities, as well as the flexibility and scalability of the data centre design.

Question 2

Which type of copper wire is used for grounding the racks to the SRG?

AThin copper cable to keep the cost low for grounding.

BThick copper cable to create better grounding.

CBraided copper wire or flat copper strip.

DCopper cable with plastic insulation (isolation).

Answer : C

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 have lower 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.

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

Question 3

Which is the most damaging type of floor load?

AConcentrated Load / Point Load (CP/ PL)

BUniformly Distributed Load (UDL)

CRolling Load (RL)

DAll loads are equally damaging to raised floor tiles

Answer : C

The most damaging type of floor load for raised floor tiles in a data centre is the rolling load (RL), according to the CDCP Preparation Guide1 and various web sources234. A rolling load is the load that is applied by a moving object, such as a pallet jack, a forklift, or a rack on wheels. A rolling load can cause more stress and fatigue on the raised floor tiles than a static load, such as a concentrated load (CP) or a uniformly distributed load (UDL), because it creates dynamic forces and impacts that can crack, dent, or deform the tiles. Moreover, a rolling load can also damage the pedestals and stringers that support the tiles, and cause the tiles to become loose or misaligned. Therefore, when designing and installing a raised floor system, it is important to consider the maximum rolling load that the tiles can withstand, and to use appropriate materials and methods to enhance the strength and durability of the tiles. For example, some possible solutions include using steel or concrete-filled tiles, reinforcing the edges and corners of the tiles, and using locking or gravity-held systems to secure the tiles.

1: CDCP Preparation Guide, page 23, section 2.4.2 2: Top 5 Considerations - Selecting a Data Center Raised Floor Tile5, page 1, section 1 3: Raised Floor Systems: Explained, Improved and Reinvented6, page 1, section 1 4: Raised Floor Systems: Common Problems and Solutions7, page 1, section 1

Question 4

What should be considered when implementing hot- or cold-aisle containment in an existing computer room?

AEquipment will get too hot at the rear (back) of the rack potentially resulting in more ICT hardware failures.

BThe delta-T of the equipment will increase too much causing reliability issues.

CIt creates potential issues with the existing fire suppression system(s).

DIt will be more difficult to install power and network cabling in the contained area.

Answer : C

Hot- or cold-aisle containment is a strategy to improve the cooling efficiency and reduce the energy consumption of data centers by isolating the hot exhaust air from the cold supply air. However, implementing this strategy in an existing computer room may create potential issues with the existing fire suppression system(s), such as:

* The containment barriers may interfere with the distribution and activation of the fire suppression agents, such as water, gas, or aerosol, and reduce their effectiveness in extinguishing a fire.

* The containment barriers may create pockets of high temperature and pressure that could damage the equipment or the containment structure itself in the event of a fire.

* The containment barriers may obstruct the access and visibility of the fire detection and alarm devices, such as smoke detectors, heat sensors, or manual call points, and delay the response time of the fire suppression system(s).

* The containment barriers may violate the local fire codes and regulations that specify the minimum clearance and ventilation requirements for the data center.

Therefore, when implementing hot- or cold-aisle containment in an existing computer room, it is important to consider the impact on the existing fire suppression system(s) and take appropriate measures to ensure the safety and compliance of the data center, such as:

* Consulting with the fire authorities and the fire suppression system vendor to assess the compatibility and suitability of the containment solution with the existing fire suppression system(s).

* Modifying or upgrading the existing fire suppression system(s) to accommodate the containment solution, such as relocating or adding fire suppression devices, adjusting the discharge rate and pressure, or installing a secondary fire suppression system within the contained area.

* Installing fire-rated containment barriers that can withstand high temperatures and resist the spread of fire and smoke, and that have self-closing or automatic release mechanisms in case of a fire.

* Installing fire detection and alarm devices within the contained area and ensuring their proper integration and communication with the existing fire suppression system(s).

* Conducting regular testing and maintenance of the fire suppression system(s) and the containment solution to ensure their functionality and reliability.

Question 5

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

AThe casters and feet should be larger to avoid a too heavy point load on the floor tile.

BSkirts at the bottom of the rack to avoid air flow between the hot and cold aisles.

CCasters and feet should be of a soft material, for example rubber, to avoid damage to the raised floor tile.

DCasters and feet should not be locked to ensure the racks are still able to be moved to another position.

Answer : A

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.

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

Question 6

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

AFailure

BTermination

CHindrance

DObstacle

Answer : A

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.

* EPI Data Centre Professional (CDCP) Preparation Guide, page 9

* What is Failure? | Definition from WhatIs.com

Question 7

Which type of Humidifier is composed of water-filled canister containing electrodes?

AInfrared Humidifiers

BWater Canister Humidifier

CSteam Canister Humidifier

DUltrasonic Humidifier

Answer : C

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.

Exin CDCP Certified Data Centre Professional Exam Practice Test