Question 1

Sprinkler heads used in computer rooms activate at what temperature?

Accepted Answer

A

Explanation: Sprinkler heads in computer rooms and data centers must activate quickly in a fire but remain stable during normal high-temperature operations. They are typically specified with an "Ordinary" temperature classification as defined by NFPA 13. The lowest activation temperature within this standard classification is 57 °C (135 °F). This rating provides a rapid response to a fire event while ensuring the activation temperature is significantly above the maximum allowable ambient temperature of the data center, thus preventing accidental discharge.

Question 2

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

Accepted Answer

A

Explanation: The entire weight of a fully populated equipment rack is concentrated onto the small contact areas of its casters or feet. This creates a significant point load (pressure) on the raised floor tile. Raised floor tiles have a specific concentrated load rating, which can be easily exceeded by the small, hard wheels of a heavy rack, leading to tile cracking or catastrophic failure. Using casters or feet with a larger surface area distributes the weight more broadly, reducing the point load to a safe level and preserving the structural integrity of the raised floor system.

Question 3

Where should exit/emergency signs be located?

Accepted Answer

B

Explanation: According to universal life safety codes, which are a foundational component of data center design and certification, emergency and exit signs must provide a clear, unambiguous, and continuous path to safety. This requires placing signs not only at the final exit doors but also along the entire escape route. Directional indicators, such as arrows, are mandatory wherever the direction of travel to the nearest exit is not immediately apparent. This ensures that personnel can quickly and safely evacuate from any point within the facility during an emergency.

Question 4

What is a requirement for both CCTV cameras and recording equipment?

Accepted Answer

C

Explanation: In a data center environment, security systems are considered critical infrastructure essential for maintaining the integrity and availability of the facility. To ensure continuous operation, especially during a primary power failure, both the CCTV cameras and the recording equipment must be connected to an Uninterruptible Power Supply (UPS). This guarantees that surveillance and recording capabilities are not compromised, which is a fundamental requirement for data center physical security and operational continuity.

Question 5

When referring to the internal mounting space in racks, equipment manufactures generally refer to
standardized height of electronic modules “U” or “RU”. What is the height of 1 “U” or “RU”?

Accepted Answer

C

Explanation: A Rack Unit, abbreviated as U or RU, is a standardized unit of measurement for the height of electronic equipment designed to be mounted in a 19-inch or 23-inch rack. According to the standards set by the Electronic Industries Alliance (EIA), specifically EIA-310-E, one rack unit (1U) is defined as 1.75 inches, which is equivalent to 44.45 millimeters (commonly rounded to 4.45 cm). This standardization ensures that servers, networking devices, and other rack-mountable equipment from various manufacturers can fit into any standard rack.

Question 6

What is the purpose of a service corridor?

Accepted Answer

D

Explanation: A service corridor is a critical architectural component in modern data center design, particularly for facilities aiming for high availability. It is a secure, restricted-access area that typically runs adjacent to or around the main computer room (white space). This corridor houses essential support equipment such as Computer Room Air Conditioning (CRAC) units, Computer Room Air Handler (CRAH) units, and power distribution panels. Its primary function is to allow technicians and engineers to perform routine maintenance, monitoring, and emergency servicing on this infrastructure without needing to enter the highly controlled and secured computer room environment. This separation minimizes the risk of operational disruption, human error, and contamination within the critical IT space.

Question 7

Does unplanned downtime of a data centre have an impact on the business results?

Accepted Answer

C

Explanation: A data center houses the critical IT infrastructure—servers, storage, and networking—that runs an organization's essential applications and services. Therefore, an unplanned outage of the data center directly translates to an outage of these business services, causing business downtime. This downtime leads to tangible negative impacts such as lost revenue, decreased productivity, damage to brand reputation, and potential regulatory penalties. The data center's availability is intrinsically linked to the business's ability to operate and generate revenue.

Question 8

What is the main risk for a data centre when the water supply fails?

Accepted Answer

C

Explanation: The main risk is determined by the severity of the impact. While multiple systems may use water, the backup power system is a critical life-support component. During a utility power outage, the data center relies entirely on its backup generators. Many large diesel generators use cooling systems that may require a continuous source of make-up water, especially for extended run times (e.g., systems using cooling towers). A failure of the water supply could lead to the generator overheating and shutting down, causing a complete and catastrophic failure of the data center. This potential for total failure makes it the main risk.

Question 9

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

Accepted Answer

A

Explanation: The primary function of a data center monitoring system, such as a Data Center Infrastructure Management (DCIM) or Building Management System (BMS), is to provide real-time operational intelligence. These systems continuously track critical parameters like power, cooling, and environmental conditions (e.g., temperature, humidity). By establishing baseline performance and setting alert thresholds, they enable the early detection of anomalies. This proactive identification of potential issues allows operations staff to intervene before a minor fault escalates into a major service-disrupting event or "disaster," thereby ensuring the availability and reliability of the data center services.

Question 10

The expected time to Recover/Repair from a system from a failure is defined as .

Accepted Answer

D

Explanation: MTTR, or Mean Time To Repair (also Mean Time To Recover), is the standard industry metric for the average time required to repair a failed system and restore it to operational status. This duration includes all phases of the repair process: the time to detect the failure, diagnose the problem, obtain necessary replacement parts, perform the physical repair, and subsequently test the system to ensure it is fully functional. MTTR is a critical measure of a system's maintainability and a key variable in calculating overall availability, often expressed in the formula: Availability = MTBF / (MTBF + MTTR).

Question 11

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

Accepted Answer

C

Explanation: The ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) Technical Committee 9.9 provides thermal guidelines for data processing environments. For typical enterprise-grade servers and equipment (classified as A1 and A2), the recommended environmental envelope for air entering the IT equipment is a dry-bulb temperature between 18°C and 27°C (64.4°F and 80.6°F). This range is established to balance optimal equipment reliability and performance with the goal of improving data center energy efficiency by reducing overcooling.

Question 12

What should be considered when using a direct air handler for a data centre?

Accepted Answer

B

Explanation: A direct air handler, also known as a direct air-side economizer, uses ambient outside air to cool the data center. The primary and most critical consideration for this technology is the quality of the source air. The outdoor environment's temperature, humidity, and level of particulate and gaseous contamination must be within the acceptable ranges defined by standards organizations like ASHRAE for IT equipment. If the external air is too hot, humid, dry, or polluted, it can damage sensitive electronics, negating the energy-saving benefits and posing a significant operational risk. Therefore, a thorough analysis of the local climate and air quality is fundamental before implementation.

Question 13

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

Accepted Answer

A

Explanation: This question addresses a fundamental principle of electromagnetism. Magnetic fields (represented by H for magnetic field strength and B for magnetic flux density) are generated by the movement of electric charges, which constitutes an electric current. According to Ampere's Law, the strength of the magnetic field circulating around a conductor is directly proportional to the amount of current flowing through it. In a data center context, this is a critical concept for managing Electromagnetic Interference (EMI), as high-current power cables are significant sources of magnetic fields that can disrupt sensitive data signals.

Question 14

Can Electro Magnetic Fields (EMF) cause data centre failures?

Accepted Answer

A

Explanation: High levels of Electro Magnetic Fields (EMF), often referred to as Electromagnetic Interference (EMI), can induce unwanted voltages and currents in electronic circuitry and data cabling. This interference can corrupt data signals, cause logic errors in processors and memory, and in severe cases, lead to permanent damage to sensitive components. Data center design standards, therefore, mandate careful site selection to avoid external sources of high EMF and recommend shielding and proper grounding practices within the facility to mitigate both external and internal sources of interference, thus preventing potential failures.

Question 15

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

Accepted Answer

A

Explanation: For life safety and emergency egress, doors from a computer room must swing in the direction of exit travel, which is outwards. This is a mandatory requirement stipulated by major safety standards such as the NFPA 101 Life Safety Code. In an emergency, personnel will push the door to exit; an outward swing facilitates a quick and unobstructed evacuation. Furthermore, an outward-swinging door helps to maintain the integrity of the room seal during the discharge of a gaseous fire suppression system, as the internal pressure pushes the door more firmly into its frame, preventing the suppression agent from escaping.

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