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| Topic 1 |
- Data Centre Life Cycle and Standards: This section of the exam measures the skills of data center professionals and covers the various stages involved in the life cycle of a data center, from planning and design to implementation and decommissioning.
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| Topic 2 |
- Designing and Implementing a Data Centre: In this module, the exam assesses the knowledge of Exin data center professionals tasked with the design and implementation of data centers. Candidates will learn the key principles of creating an efficient data center layout, including considerations for scalability, redundancy, and security.
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| Topic 3 |
- Data Centre Environmental Considerations and Efficiency: This section evaluates the proficiency of data center professionals in addressing environmental factors and promoting efficiency within data center operations. The target audience, including data center managers and engineers, will be tested on their ability to identify and implement measures that enhance energy efficiency, cooling management, and sustainable practices.
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EXIN EPI Certified Data Centre Specialist Sample Questions (Q15-Q20):
NEW QUESTION # 15
Two servers stacked with no gap (metal-to-metal). What heat transfer occurs?
- A. Conduction
- B. Radiation
- C. No heat transfer
- D. Convection
Answer: A
Explanation:
Heat transfer occurs in three modes: conduction, convection, radiation. Conduction is transfer by direct contact of solids. Since the servers are touching metal-to-metal, heat flows directly from the warmer surface to the cooler one via conduction.
* Radiation occurs without contact, across air or vacuum.
* Convection requires a fluid medium like air, which is absent between surfaces.
* "No heat transfer" is incorrect-there will always be transfer.
Therefore, the unwanted transfer here is conduction.
References: ASHRAE Fundamentals - Heat Transfer Basics, EXIN DCS Thermal Management Section.
NEW QUESTION # 16
Which formula is correct?
- A. Phase-to-Neutral Voltage = Phase-to-Neutral voltage * 1.732
- B. Phase-to-Neutral Voltage = Phase-to-Phase voltage * 1.732
- C. Phase-to-Neutral Voltage = Phase-to-Phase voltage /1.732
- D. Phase-to-Neutral Voltage = (Phase-to-Phase voltage * 1.732) / Phase-to-Neutral Voltage
Answer: C
Explanation:
The correct formula for calculating Phase-to-Neutral Voltage in a three-phase power system is Phase-to- Neutral Voltage = Phase-to-Phase Voltage / 1.732. This formula applies to balanced three-phase systems, where 1.732 (or #3) represents the relationship between line-to-line and line-to-neutral voltages.
Detailed Explanation:
In three-phase systems, Phase-to-Phase Voltage is higher than Phase-to-Neutral Voltage by a factor of #3.
Dividing the phase-to-phase voltage by 1.732 gives the phase-to-neutral voltage, which is critical for understanding power distribution in three-phase electrical systems commonly found in data centers.
EPI Data Center Specialist References:
EPI electrical training highlights the importance of knowing these calculations for designing and maintaining balanced power systems, which are essential for stable and efficient data center operations.
NEW QUESTION # 17
Do you need to consider bullet (ballistic) protection when designing a data center?
- A. Yes, bullet protection is a requirement of ANSI/TIA-942 for Rated-3/4 data centers
- B. No, there is no reason for implementing bullet protection as you cannot predict the type of weapons that might be used
- C. No; bullet protection is not a requirement of ANSI/TIA-942
- D. Yes, but only when the data center is built in an area with a high criminality rate or with a risk of terrorist attacks
Answer: D
Explanation:
ANSI/TIA-942 requires a risk assessment-based approach to physical security; ballistic protection is not mandated but may be justified by threat analysis.
* A is incomplete (it may still be required by risk).
References: ANSI/TIA-942-B §6.4 Physical Security (threat/risk assessment), ISO 31000 (risk management).
NEW QUESTION # 18
You need to determine the strategy for the cooling audit. All the servers are based on a front-to-rear (F-R) airflow design.
Which location for the temperature/humidity measurement should you recommend for the audit?
- A. At the front/intake of the server at 50 mm/2 inch
- B. At 1.5 meters/5 feet above the floor in the middle of the cold aisle
- C. At 1.5 meters/5 feet above the floor in the middle of the hot aisle
- D. At the back/rear of the server at 50 mm/2 inch
Answer: A
Explanation:
For a cooling audit in a data center, it is essential to measure temperature and humidity where air enters the servers to accurately assess cooling performance. In this case, since all servers have a front-to-rear (F-R) airflow design, measuring at the front/intake of the server will provide a precise understanding of the cooling conditions that the equipment is experiencing.
Detailed Explanation:
Servers with a front-to-rear airflow design draw in cool air from the cold aisle at the front, which is then exhausted into the hot aisle at the rear. By measuring temperature and humidity 50 mm/2 inches from the front intake, you gather data on the air conditions right before it enters the servers, providing an accurate representation of the cooling environment as it directly impacts the equipment.
Measuring in the cold aisle at the front intake ensures that the readings reflect the actual conditions of the incoming air that the servers depend on for effective cooling. This approach is consistent with best practices for maintaining thermal conditions in a data center, as it helps confirm that the cooling systems are delivering air within the required temperature and humidity specifications.
EPI Data Center Specialist References:
According to the EPI Data Center Specialist curriculum, the optimal placement for temperature and humidity sensors is at the intake of the equipment in the cold aisle, as it directly correlates to the environmental conditions affecting the servers. This positioning allows for a more effective audit of cooling performance, which is critical for maintaining the reliability and efficiency of the data center's operations.
NEW QUESTION # 19
An MCB needs to be installed in the PDU of an air-conditioner unit.
Which breaking curve should you select?
- A. A-Curve
- B. C-Curve
- C. D-Curve
- D. B-Curve
Answer: B
Explanation:
For an MCB (Miniature Circuit Breaker) in the PDU of an air-conditioning unit, a C-Curve is recommended. C-Curve breakers are suitable for circuits with moderate inrush currents, such as those experienced in air conditioning units. They provide protection against overloads while accommodating the inrush without nuisance tripping.
Detailed Explanation:
C-Curve breakers trip when currents exceed 5 to 10 times the rated current, making them ideal for devices like air conditioners that experience moderate inrush currents upon startup. This characteristic provides a balance between protection and resilience against startup surges, preventing unnecessary trips while safeguarding the circuit.
EPI Data Center Specialist References:
EPI guidance for data center electrical systems specifies that C-Curve breakers are appropriate for equipment with inrush characteristics similar to air conditioning units, as they help prevent operational interruptions caused by typical surges during equipment start-up.
NEW QUESTION # 20
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