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

What is the best practice for cutting holes in the raised floor tile?

AAnywhere as data centre tiles are designed to allow cut-outs anywhere.

BDraw a cross on the tile and when making a cut-out do not touch a line and avoid the corners.

CDraw a line in the middle of the tile and never touch the line when making the cut.

DCut the tiles at the corner so the pedestals can be used as a vertical cable manager.

Answer : B

According to the Raised Floor Installation Manual, the best practice for cutting holes in the raised floor tile is to draw a cross on the tile and when making a cut-out do not touch a line and avoid the corners1. This ensures that the structural integrity and load-bearing capacity of the tile are not compromised. Cutting holes anywhere, touching the line, or cutting the corners can weaken the tile and cause it to crack or collapse1. Additionally, the manual recommends using a drill press or a reciprocating saw with a metal or bi-metal cutting blade, and deburring all sharp edges1.

Question 3

What needs to be installed in the battery room when using Lithium-ion batteries?

AA battery management system to monitor and prevent unsafe temperatures during charging/discharging.

BHigh capacity air-conditioning equipment since Lithium-ion batteries are sensitive to high temperatures, which can reduce their lifetime.

CA proper ventilation system since Lithium-ion batteries produce highly flammable Hydrogen gas during charging.

DA proper supply of distilled water.

Answer : A

According to the EPI Data Centre Training Framework, lithium-ion batteries are becoming more popular in data centres due to their higher energy density, longer lifespan, and lower maintenance costs compared to lead-acid batteries1. However, lithium-ion batteries also have some drawbacks, such as higher initial cost, stricter safety requirements, and potential thermal runaway risks1. Therefore, a battery management system (BMS) is essential to monitor and control the voltage, current, temperature, and state of charge of each battery cell or module, and to prevent overcharging, over-discharging, or overheating23. A BMS can also communicate with the UPS system and provide information on the battery status, performance, and health2.

Question 4

Where should exit/emergency signs be located?

ADepends on the policy of the data centre

BAt every escape door and pathways leading to doors (arrows)

CIn the Computer room only

DAt each door

Answer : B

According to the EPI Data Centre Operations Standard (DCOS), exit/emergency signs should be located at every escape door and pathways leading to doors (arrows) to ensure a safe and quick evacuation in case of an emergency1. This is also consistent with the best practices for data centre emergency preparedness and response, which recommend having a clear and visible signage system for emergency exits23.

Question 5

What is the main advantage of busbar trunking compared to stand electrical cabling?

ABusbar trunking is less expensive.

BBusbar trunking has a fixed power rating.

CBusbar trunking allows for flexibility.

DBusbar trunking can be located both overhead and under the raised floor.

Answer : C

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.

Question 6

What factor should be considered when placing fluorescent lighting in the data centre?

AFluorescent lights should not be connected to the back-up generator.

BFluorescent lights should only be installed in equipment supporting areas and not in the Computer/Server room.

CFluorescent lights should not be connected to the mains power supply.

DFluorescent lights should not be connected to the same UPS that supports the ICT equipment.

Answer : D

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.

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

Question 7

What is the current recommended temperature for ICT equipment as described in the ASHREA TC 9.9 guideline?

A8-18 C (46.4 -64.4 F)

B20-40 C (68 - 104 F)

C18-27 C (64.4 - 80.6F)

D25-45 C (77 - 113 F)

Answer : C

The current recommended temperature for ICT equipment as described in the ASHRAE TC 9.9 guideline is 18-27 C (64.4 - 80.6F). 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.

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

Exin Certified Data Centre Professional Exam Practice Test