631 お客様のコメント
質問 1：
A 5kW (power consumption) server keeps crashing with the message 'temperature too high'.
The intake temperature is measured at 25 °C/77 °F and a relative humidity (RH) level of 50%.
The exhaust temperature is 29 °C/84 °F and 45% RH.
The raised floor is providing an adequate amount of CFM/CMH at a reasonable velocity.
The pressure under the raised floor is approximately 25 Pa/0.1 inch H₂O.
Analyze the situation and indicate what the most likely cause is for this server to crash.
A. Dust inside the server causing issues with convection-based heat transfer
B. The exhaust temperature is exceeding the ASHRAE recommended values
C. The raised floor pressure is too low and/or the raised floor tile % opening is not adequate
D. No cause could be determined as the CFM/CMH of the air conditioning equipment is not stated
正解：A
解説: (Pass4Test メンバーにのみ表示されます)
質問 2：
You are allowed to use a calculator for this question. A battery bank is rated at a total capacity of 600 Ah. Calculate how much charging current the rectifier should be able to supply as charging current.
A. 60 Amperes
B. 30 Amperes
C. 80 Amperes
D. 12 Amperes
正解：B
解説: (Pass4Test メンバーにのみ表示されます)
質問 3：
Do you need to consider bullet (ballistics) protection when designing a data center?
A. Bullet (ballistics) protection is required by ANSI/TIA-942 for all data centers.
B. Bullet (ballistics) protection is required by ANSI/TIA-942 for data centers Rated 3/4.
C. Bullet (ballistics) protection is only required when the data center is located in an area with a high crime rate.
D. Bullet (ballistics) protection is only required if the facility is a potential target or the building is in the vicinity of a potential target.
正解：D
解説: (Pass4Test メンバーにのみ表示されます)
質問 4：
The electrical diagram of the data center shows the following UPS configuration and has a load of 80 kW.
What is the set-up in this data center?
A. 2(N+1)
B. (N+1)-(N+1)
C. N+N(+1)
D. 2+N+1
正解：A
解説: (Pass4Test メンバーにのみ表示されます)
質問 5：
What is the main reason to install Earth Leakage protection?
A. Protection against lightning strikes
B. Protection of ICT equipment against high-frequency noise currents
C. Protection of human lives
D. Improvement of the data center grounding/earthing system
正解：C
解説: (Pass4Test メンバーにのみ表示されます)
質問 6：
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. Only when the racks might block access to the fire panel.
B. Only when the rack height obstructs a potential fire suppression release point.
C. Yes, the design of the racks has an influence on the fire suppression system design.
D. No, cooling and design of racks have no influence on the fire suppression system design.
正解：C
解説: (Pass4Test メンバーにのみ表示されます)
A 5kW (power consumption) server keeps crashing with the message 'temperature too high'.
The intake temperature is measured at 25 °C/77 °F and a relative humidity (RH) level of 50%.
The exhaust temperature is 29 °C/84 °F and 45% RH.
The raised floor is providing an adequate amount of CFM/CMH at a reasonable velocity.
The pressure under the raised floor is approximately 25 Pa/0.1 inch H₂O.
Analyze the situation and indicate what the most likely cause is for this server to crash.
A. Dust inside the server causing issues with convection-based heat transfer
B. The exhaust temperature is exceeding the ASHRAE recommended values
C. The raised floor pressure is too low and/or the raised floor tile % opening is not adequate
D. No cause could be determined as the CFM/CMH of the air conditioning equipment is not stated
正解：A
解説: (Pass4Test メンバーにのみ表示されます)
質問 2：
You are allowed to use a calculator for this question. A battery bank is rated at a total capacity of 600 Ah. Calculate how much charging current the rectifier should be able to supply as charging current.
A. 60 Amperes
B. 30 Amperes
C. 80 Amperes
D. 12 Amperes
正解：B
解説: (Pass4Test メンバーにのみ表示されます)
質問 3：
Do you need to consider bullet (ballistics) protection when designing a data center?
A. Bullet (ballistics) protection is required by ANSI/TIA-942 for all data centers.
B. Bullet (ballistics) protection is required by ANSI/TIA-942 for data centers Rated 3/4.
C. Bullet (ballistics) protection is only required when the data center is located in an area with a high crime rate.
D. Bullet (ballistics) protection is only required if the facility is a potential target or the building is in the vicinity of a potential target.
正解：D
解説: (Pass4Test メンバーにのみ表示されます)
質問 4：
The electrical diagram of the data center shows the following UPS configuration and has a load of 80 kW.
What is the set-up in this data center?
A. 2(N+1)
B. (N+1)-(N+1)
C. N+N(+1)
D. 2+N+1
正解：A
解説: (Pass4Test メンバーにのみ表示されます)
質問 5：
What is the main reason to install Earth Leakage protection?
A. Protection against lightning strikes
B. Protection of ICT equipment against high-frequency noise currents
C. Protection of human lives
D. Improvement of the data center grounding/earthing system
正解：C
解説: (Pass4Test メンバーにのみ表示されます)
質問 6：
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. Only when the racks might block access to the fire panel.
B. Only when the rack height obstructs a potential fire suppression release point.
C. Yes, the design of the racks has an influence on the fire suppression system design.
D. No, cooling and design of racks have no influence on the fire suppression system design.
正解：C
解説: (Pass4Test メンバーにのみ表示されます)
小友** -
CDCSを買って読んでみました。これで合格点は取れます。問題部分だけの暗記でもいけるレベルです。EXINは信頼できます。