Question 1

The humidity in the computer room has increased from about 60% up to 85% Relative Humidity (RH). What potential risk does this pose to your equipment?

Options :

A : No risks at all

B : The risk of excessive wear and corrosion will increase

C : The electrostatic discharge (ESD) levels will go up

D : There will be a cooling risk due to a high wet bulb temperature

Answer: B

Question 2

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?

Options :

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

D : Only when the racks might block access to the fire panel.

Answer: C

Question 3

If a waveform period is determined to be 10 microseconds in duration, what is the frequency of the signal?

Options :

A : 100 kHz

B : 10 kHz

C : 1000 Hz

D : 100 Hz

Answer: A

Question 4

A 5kW (power consumption) server keeps crashing with the message 'temperature too high'. The intake temperature is measured at 25 Â°C Â°F and a relative humidity (RH) level of 50%. The exhaust temperature is 29 Â°C Â°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 Hâ‚‚O. Analyze the situation and indicate what the most likely cause is for this server to crash.

Options :

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

Answer: A

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?

Options :

A : It does not matter, as the Sensible Heat Ratio has nothing to do with efficiency

B : Not relevant, as Sensible Heat Ratio is only specified for air-conditioner equipment to indicate the ratio between intake temperature and exhaust temperature.

C : Unit A

D : Unit B

Answer: D

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