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Home EXIN CDCS

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.
  1. A
    Dust inside the server causing issues with convection-based heat transfer
  2. B
    The exhaust temperature is exceeding the ASHRAE recommended values
  3. C
    The raised floor pressure is too low and/or the raised floor tile % opening is not adequate
  4. D
    No cause could be determined as the CFM/CMH of the air conditioning equipment is not stated

Correct Answer: A ?️

Question #2
What is the main disadvantage of using a ToR (Top of Rack) design?
  1. A
    A single ToR (Top of Rack) switch is more expensive than an EoR (End of Row) switch.
  2. B
    You need a separate rack to install all your ToR (Top of Rack) switches.
  3. C
    There will be more switches to manage.
  4. D
    A ToR (Top of Rack) switch has only optical interfaces.

Correct Answer: C ?️

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?
  1. A
    Standard air conditioning units, as spares might be not readily available
  2. B
    Any cooling system can be efficient, because the outside air temperature will not influence the temperature of the air intake of the ICT equipment
  3. C
    Waterside economizer
  4. D
    Airside economizer

Correct Answer: D ?️

Question #4
When are the wet bulb’s and dry bulb’s temperature identical?
  1. A
    When the dry bulb’s temperature is at the lowest allowable temperature for IT equipment as per the ASHRAE
  2. B
    When the dry bulb’s temperature is at the highest allowable temperature for IT equipment as per the ASHRAE
  3. C
    When the relative humidity is at the best practice value for relative humidity, being 50% RH
  4. D
    When the relative humidity is 100%

Correct Answer: D ?️

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?
  1. A
    It does not matter, as the Sensible Heat Ratio has nothing to do with efficiency.
  2. B
    Not relevant, as Sensible Heat Ratio is only specified for air-conditioner equipment to indicate the ratio between intake temperature and exhaust temperature.
  3. C
    Unit A
  4. D
    Unit B

Correct Answer: D ?️

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