EXIN CDCS Exam Practice Questions (P. 1)
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Question #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 adequate amount of CFM/CMH at a reasonable velocity.
- The pressure under the raised floor is approximately 25 Pa/0.1 inch H20.
Analyze the situation and indicate what the most likely cause is for this server to crash.
- 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 adequate amount of CFM/CMH at a reasonable velocity.
- The pressure under the raised floor is approximately 25 Pa/0.1 inch H20.
Analyze the situation and indicate what the most likely cause is for this server to crash.
- ADust inside the server causing issues with convection-based heat transfer
- BThe exhaust temperature is exceeding the ASHRAE recommended values
- CThe raised floor pressure is too low and/or the raised floor tile % opening is not adequate
- DNo cause could be determined as the CFM/CMH of the air conditioning equipment is not stated
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Question #2
What is the main disadvantage of using a ToR (Top of Rack) design?
- AA single ToR (Top of Rack) switch is more expensive than an EoR (End of Row) switch.
- BYou need a separate rack to install all your ToR (Top of Rack) switches.
- CThere will be more switches to manage.
- DA ToR (Top of Rack) switch has only optical interfaces.
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Question #3
The location of a data center is just above the Arctic Circle (North Pole). The outside air temperature is never above 21 °C/70 °F.
Taking energy efficiency as the highest priority, which cooling system should you recommend?
Taking energy efficiency as the highest priority, which cooling system should you recommend?
- AStandard air conditioning units, as spares might be not readily available
- BAny cooling system can be efficient, because the outside air temperature will not influence the temperature of the air intake of the ICT equipment
- CWaterside economizer
- DAirside economizer
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Question #4
When are the wet bulb’s and dry bulb’s temperature identical?
- AWhen the dry bulb’s temperature is at the lowest allowable temperature for IT equipment as per the ASHRAE
- BWhen the dry bulb’s temperature is at the highest allowable temperature for IT equipment as per the ASHRAE
- CWhen the relative humidity is at the best practice value for relative humidity, being 50% RH
- DWhen the relative humidity is 100%
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Question #5
An air-conditioner unit needs to be selected. Two types are available:
- Unit-A has a Sensible Heat Ratio (SHR) of 0.7.
- Unit-B has a Sensible Heat Ratio (SHR) of 0.9.
From an efficiency point of view, which one should be selected?
- Unit-A has a Sensible Heat Ratio (SHR) of 0.7.
- Unit-B has a Sensible Heat Ratio (SHR) of 0.9.
From an efficiency point of view, which one should be selected?
- AIt does not matter, as the Sensible Heat Ratio has nothing to do with efficiency.
- BNot relevant, as Sensible Heat Ratio is only specified for air-conditioner equipment to indicate the ratio between intake temperature and exhaust temperature.
- CUnit A
- DUnit B
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