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

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What mainly affects the cooling capacity of a raised floor tile?

• A.Type of ICT equipment, location of the air conditioner, pressure under the raised floor, allowable temperature in the hot aisle
• B.Relative humidity in the computer room, temperature of the cold air, pressure under the raised floor, construction material of the tile
• C.Percentage of the surface opening, obstruction of the supporting construction, pressure under the raised floor, damper construction
• D.Percentage of the surface opening, airflow direction of the ICT equipment, temperature difference between the air intake and air exhaust of the ICT equipment, construction material of the tile

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When installing a raised floor, can we use a spirit level bar to level the floor?

• A.Yes, spirit level bars can be used as long as their length is longer than 60 cm/2 ft (the size of a typical raised floor tile).
• B.No, because using a spirit level bar, a measurement error will be transferred from pedestal to pedestal.
• C.Yes, but spirit level bars can only be used in the vertical plane.
• D.Yes, using a spirit level bar for raised floors higher than 40 cm is preferred.

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The temperature in the computer room is being increased from 18°C/64°F to 27°C/81°F.
What is the impact, if any, on the amount of gas required to suppress a fire assuming the gas is a Halocarbon?

• A.The amount of gas required will be higher
• B.The amount of gas required will not change
• C.The amount of gas required will be lower
• D.The change to the amount of gas cannot be determined without knowing the change in humidity as well

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When are the wet bulb and dry bulb temperatures identical?

• A.When the dry bulb's temperature is at the lowest allowable temperature for IT equipment as per ASHRAE
• B.When the dry bulb's temperature is at the highest allowable temperature for IT equipment as per ASHRAE
• C.When the relative humidity is at the best practice value for relative humidity, being 50% RH
• D.When the relative humidity is 100%

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