最新的EXIN CDCS免費考試真題

問題1

What is a potential disadvantage of using water mist as a fire extinguishing system?

A. It extracts oxygen from the air creating a potential risk for humans inside the computer room

B. It will rapidly increase the humidity level in the data center, which can cause a potential risk for the operation of the equipment

C. It only uses 10% of the water normally used in a water-based fire suppression, which might not be enough to suppress the fire

D. It has droplets that are too small (100-120 microns) so it can only be used for small fires

正確答案: B

說明：（僅 Fast2test 成員可見）

問題2

The 'maximum exposed area' of the fire-rated glass is defined by the supplier as 3 sqm/32 sqft. The window area is 4 sqm/43 sqft.
What would be the best option?

A. Split the window in two equal parts using an aluminum frame.

B. Split the window in two equal parts fitted together with transparent silicon glue.

C. Do not use fire-rated glass due to the size limit and replace it with normal glass.

D. Split the window into parts smaller than specified as the maximum exposed area and ensure fire-rated frames are used.

正確答案: D

說明：（僅 Fast2test 成員可見）

問題3

You are working with a customer who requires a guarantee that THDi levels coming from the UPS should not exceed more than 3% THDi. Furthermore, he wants to run a power-efficient data center. The UPS has a 6- Pulse SCR/Thyristor based rectifier. The current load on the UPS is approximately 80%. The customer indicates they are not expecting any changes on the ICT infrastructure for the next 3 years.
What should you recommend?

A. Install an isolation transformer rated at K13 or K20

B. Nothing, the UPS will be able to take care of the right levels of THDi

C. Install an active harmonic filter on the UPS

D. Install a passive harmonic filter on the UPS

正確答案: C

說明：（僅 Fast2test 成員可見）

問題4

The UPS of a data center, with an ANSI/TIA-942 Rating-4, is installed with the rectifier connected to power feed A and the bypass/reserve line input connected to power feed B.
To which feed will the output of the UPS be synchronized?

A. Feed B

B. The UPS will not synchronize to any of the feeds but use an internal clock to set the output voltage and frequency

C. Feed A

D. Depends on the setting of the UPS, as the UPS can normally be set to either feed

正確答案: D

說明：（僅 Fast2test 成員可見）

問題5

A data center scores Rated-3 in mechanical, Rated-4 in electrical, and Rated-2 in architectural.
What is the overall Rating of this data center when the Rating is based on the ANSI/TIA-942?

A. Rated-4 since that is the highest rating received

B. Depends on the Rating scored in telecommunications

C. Rated-4 since electrical is more important than mechanical and architectural

D. Rated-2 since that is the lowest rating received

正確答案: D

說明：（僅 Fast2test 成員可見）

問題6

Do all residual current devices (RCDs) use the same operating principle?

A. Yes, they all measure voltage on the earth conductor

B. No, ELCB measures earth voltage, whereas RCD detects current differences

C. No, depending on regulations some use thermal-magnetic operation

D. Yes, they all detect current differences on live and neutral wire

正確答案: B

說明：（僅 Fast2test 成員可見）

問題7

A computer room needs to be fitted out with a gas-based fire suppression system. The computer room will be a high-density data center with about 30% of the racks being closed circuit cooling blade-center racks.
Should the supplier of the fire suppression system be informed on the design of the racks?

A. No, cooling and design of racks have no influence on the fire suppression system design.

B. Only when the rack height obstructs a potential fire suppression release point.

C. Only when the racks might block access to the fire panel.

D. Yes, the design of the racks has an influence on the fire suppression system design.

正確答案: D

說明：（僅 Fast2test 成員可見）

問題8

Which formula is correct for a three-phase system?

A. Phase-to-Phase Voltage = Phase-to-Neutral Voltage × 1.732

B. Phase-to-Phase Voltage = 1 # (Phase-to-Neutral Voltage ÷ 1.732)

C. Phase-to-Phase Voltage = Phase-to-Neutral Voltage ÷ 1.732

D. Phase-to-Phase Voltage = 1 # (Phase-to-Neutral Voltage × 1.732)

正確答案: A

說明：（僅 Fast2test 成員可見）

問題9

What is the sensible heat ratio (SHR)?

A. Ratio of the cold-aisle temperature to the hot-aisle temperature

B. Ratio of the latent heat to the total of sensible plus latent heat to be removed from a conditioned space

C. Ratio of the sensible heat to the total of sensible plus latent heat to be removed from a conditioned space

D. Ratio of cold-air supply to hot-air return temperature of a cooling system

正確答案: C

說明：（僅 Fast2test 成員可見）

問題10

A computer room with a raised floor has been designed with racks in a hot/cold aisle setup.
What should you recommend for the placement of down-flow air conditioners?

A. Air conditioners should always be placed at both sides of each row of racks

B. Air conditioners perpendicular to (at the end of the row of) the Cold-Aisle

C. Air conditioners perpendicular to (at the end of the row of) the Hot-Aisle

D. Air conditioner placement has no influence on cooling effectiveness and efficiency. Hence, they can be placed at any convenient location.

正確答案: B

說明：（僅 Fast2test 成員可見）

最新的EXIN EPI Certified Data Centre Specialist - CDCS免費考試真題

聯系我們

站內鏈接

最新更新