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TEST Flashcards

1
Q

What should you take into account if you’re using tiles with deflectors or louvers?

A) Tiles with air deflectors and louvers can be heavy
B) These kinds of tiles will not allow for a flexible cooling solution
C) These kinds of tiles can only be used to cool storage equipment
D) Tiles with air deflectors or louvers will reduce the cooling capacity of the tile

A

D) Tiles with air deflectors or louvers will reduce the cooling capacity of the tile

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2
Q

A new network storage device in a non-standard sized rack of approximately 600 KG is going to be installed in the data center.
Are new floor loading calculations required?

A) Yes, additional floor loading needs to be done by the floor manager
B) No, as long as the equipment is less than 700 KG
C) Yes, a structural engineer approved and endorsed by the building owner should carry out new floor loading calculations
D) No specifications of equipment is required, the size will already be know

A

C) Yes, a structural engineer approved and endorsed by the building owner should carry out new floor loading calculations

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3
Q

Smoke sensors need to be tested in order to ensure that they pick up potential fires in the data center.
What would you recommend?

A) Test the sensors according to the vendor’s specification
B) Test the sensor by injecting smoke or simulated smoke directly into the sensor
C) Press the self-test button
D) Inject smoke at the floor level

A

D) Inject smoke at the floor level

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4
Q

How is PUE calculated?

A) Total Facility Power / Total IT Power
B) Total IT Power / Total Facility Power
C) The UPS Input / The UPS Output
D) Air Conditioning Power / Air Conditioning Output

A

A) Total Facility Power / Total IT Power

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5
Q

A battery bank is rated with a total capacity of 400 Amp hours.
How much charging current should the rectifier deliver to ensure charging?

A) 8 Amps
B) 40 Amps
C) 60 Amps
D) 80 Amps

A

B) 40 Amps

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6
Q

The pipes of a VESDA smoke detection system are installed at the air intake of an air conditioning unit inside the computer room. Is this a good practice?

A) Yes, as this reduces the amount of piping needed
B) No, the piping should be installed at the air exhaust of the air conditioner
C) No, it will cause a longer reaction time for smoke detection and there might also be an air bypass for airflow
D) It depends on the type of gas being used

A

C) No, it will cause a longer reaction time for smoke detection and there might also be an air bypass for airflow

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7
Q

A computer room is very smelly due to paint that was used during construction. In order to reduce the smell in the computer room management has requested you to install an automated aerosol release unit which releases a fresh smell every 15 minutes. Is this ok?

A) Yes
B) No

A

B) No

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8
Q

Do you need to consider blast protection when designing a data center?

A) No, Blast protection is not a requirement of TIA 9422
B) Yes, Blast protection is a requirement of TIA 9422
C) No there is no sense of implementing it because you can’t predict the impact of a bomb
D) Yes, if your data center is a potential target or your data center is in the vicinity of a potential target.

A

D) Yes, if your data center is a potential target or your data center is in the vicinity of a potential target.

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9
Q

The humidity in the data center has gone down from 50% to 35% of relative humidity.
What influence would this have on electric static discharge?

A) It has no influence
B) ESD levels would go up
C) ESD levels would go down
D) No influence as long as the temperature stays around 20 degrees Celsius

A

B) ESD levels would go up

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10
Q

The requirement of a new building code is that only batteries with the highest flame retardant material should be used.
What specifications should you give the battery supplier?

A) Castings compliant to V0
B) Castings compliant to V1
C) Castings compliant to V2
D) Castings compliant to ABS

A

A) Castings compliant to V0

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11
Q

What is the definition of concurrent maintainability?

A

Concurrent maintainability requires that each and every capacity component (including elements which are part of the distribution path) can be removed, replaced, or serviced on a planned basis without disrupting the ICT capabilities of the end user.

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12
Q

The air-intake on a mission critical server on the top of a rack measures 25 degrees Celsius.
Is this acceptable?

A) No - the temperature needs to be 20 degrees Celsius
B) As long as it does not exceed the average server room temperature of 38 degrees Celsius it’s ok
C) Yes – this is allowable according to the standards
D) It depends on the TIA 9422 rating level

A

C) Yes – this is allowable according to the standards

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13
Q

The computer room needs to be fitted with a gas-fire suppression system. The computer room will be a high-density data center with about 30% of the racks being closed-circuit cooling blade servers.
Should the supplier of the fire suppression system be informed of the chosen rack design?

A) No – the cooling and design of racks have no influence on fire suppression
B) Yes – the cooling and design of racks have an influence on fire suppression
C) Only when the rack height obstructs potential fire suppression release points
D) Only when the racks might block access to the fire pattern

A

B) Yes – the cooling and design of racks have an influence on fire suppression

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14
Q

A data center is located in an area where the demands for power is higher than the power company can supply. This means that there are a lot of power outages and power shedding. The main power is unavailable more than 800 hours a year.
What type of generator would you recommend installing?

A) A stand-by generator in a N+1 configuration
B) A continuous generator installed and no N+1 configuration is needed as the generator will be running all the time
C) A continuous generator installed in a N+1 configuration
D) A combination of stand-by prime and continuous generators

A

C) A continuous generator installed in a N+1 configuration

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15
Q

What should be taken into account when installing data cabling overhead?

A) Maintain minimum separation between the power and the power cable to ensure that the fire detection and suppression systems are not hindered
B) The copper data cable should not be placed in metal cables
C) The optical fiber cabling should always be positioned on the top of copper cabling in the same cabinet tray
D) All cabling should make sharp bends directly into the rack

A

A) Maintain minimum separation between the power and the power cable to ensure that the fire detection and suppression systems are not hindered

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16
Q

You are working with a customer that requires a guarantee that there are low THDi levels coming from your UPS, with a maximum of 3% THDi. You have a UPS with a six pulse base rectifier. The current load on the UPS is 10% of its capacity. The customer indicates that they are going to expand within 3 years and they expect to grow and put a load of up to 80% on the UPS. What would you recommend?

A) Nothing – the UPS will be just fine
B) Install an isolation transformer rated at K-13 or K-20
C) Install a passive harmonic filter
D) Install an active harmonic filter

A

D) Install an active harmonic filter

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17
Q

A data center is in operation for about 1 year and 2 months, the dust levels are relatively high.
What is the most likely root cause of this problem?

A) Low pressure in the data center
B) The cleaning crew is not doing their work
C) Every data center has dust levels which are high
D) The floor tiles are probably not fitted correctly

A

A) Low pressure in the data center

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18
Q

When designing a data center network, you notice that there’s not a lot of space for cabling in the computer room.
Which possible layout would be your best choice?

A) POP with rack
B) End of row
C) A Star network
D) It doesn’t matter, the cabling outside the rack is not influenced by the network design

A

A) POP with rack

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19
Q

What is the potential disadvantage of using water misting systems as a fire extinguishing system?

A) It only uses 10% of the water normally used, which might not be enough
B) It extracts oxygen from the air creating a potential risk to humans
C) It will rapidly increase the humidity levels in the data center
D) It has droplets which are too small and can only be used for small fires

A

C) It will rapidly increase the humidity levels in the data center

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20
Q

The temperature in the computer room is being increased from 18 degrees Celsius to 27 degrees Celsius.
What would be the impact, if any, on the amount of gas required to suppress a fire?

A) The amount of gas would be less
B) The amount of gas would be more
C) The amount of gas would not change
D) The amount of gas cannot be determined without knowing the humidity

A

A) The amount of gas would be less

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21
Q

What is the requirement for power feeds to a building for a Rated-4 data center based on TIA-942?

A) 2 feeds coming from 2 different substations - 1 power company is NOT acceptable
B) 2 feeds coming from 2 different substations - 1 power company is acceptable
C) 2 feeds coming from 1 substation split over 2 different transformers
D) 1 feed from 1 substation split over 2 separate distribution boards

A

B) 2 feeds coming from 2 different substations - 1 power company is acceptable

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22
Q

Your data center is 15 years old and you’re asked to improve energy efficiency.
In what sequence would you start to improve the data center?

A) UPS, Generator, CRAC HVAC Units, The raised floor network cabling routing
B) CRAC HVAC Units, The raised floor network cabling routing, UPS, Generator
C) Generator, UPS, The raised floor network cabling routing, CRAC HVAC Units
D) The raised floor network cabling routing, Generator, CRAC HVAC Units, UPS

A

B) CRAC HVAC Units, The raised floor network cabling routing, UPS, Generator

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23
Q

You’re changing the design of the fire suppression system for your computer room from a Halo Carbon fire suppression system to an Inert based fire suppression system.
Can you use the same formulas to calculate the amount of gas required?

A) Yes
B) No

A

B) No

24
Q

In which stage of the data center lifecycle does commissioning take place?

A) Design
B) Implement
C) Operate
D) Retire

A

B) Implement

25
Q

Three data centers are benchmarked on energy efficiency.
Data Center A has a PUE of 2.45,
Data Center B has a PUE of 1.2,
Data Center C has achieved a PUE of 1.9.
Which of these data centers is operating at the highest efficiency?

A) Data Center A
B) Data Center B
C) Data Center C

A

B) Data Center B

26
Q

What is the potential disadvantage of using hypoxic based fire suppression systems as a fire extinguishing system?

A) It can only be used in non- continuously occupied areas
B) It can only be used in computer rooms that have sufficient air changes per hour
C) The gas containers need to be close to the hazard area
D) It can only be used in computer rooms where you have sufficient positive pressure

A

A) It can only be used in non- continuously occupied areas

27
Q

Are you allowed to make design changes during the implementation phase?

A) No, after design freeze - no changes are allowed
B) Only when there is a strong business or technical justification
C) Yes, but only when the time to implement doesn’t exceed the project
D) Any change is fine

A

B) Only when there is a strong business or technical justification

28
Q

A 5KW server keeps crashing with the message “Temperature too high”. The intake temperature is measured at 25 degrees Celsius and it has a relative humidity in the room of 50%. The exhaust temperature is 29 degrees Celsius and it has a relative humidity of 45%. The raised floor provides an adequate amount of cubic feet per minute at a reasonable velocity.
Analyze the situation and indicate what is the most likely cause for this server to crash.

A) The exhaust temperature exceeds the ASHRAE recommended guidelines.
B) Dust inside the server is causing issues with convection-based heat transfer
C) Raised floor pressure is too low
D) No cause can be determined

A

B) Dust inside the server is causing issues with convection-based heat transfer

29
Q

The total power consumption of an ICT equipment in a rack is 3KW. The equipment is traditional ICT equipment with a Delta T of approximately 11 degrees Celsius.
Calculate the approximate cubic feet per minute required to cool the equipment.

A) 1500 cubic feet per minute
B) 1000 cubic feet per minute
C) 500 cubic feet per minute
D) 160 cubic feet per minute

A

C) 500 cubic feet per minute

30
Q

What is the main issue with fire rated walls construction based on international building standards?

A) They’re expensive
B) They burn fast
C) The materials they use are contaminating the environment
D) They provide no thermal protection

A

D) They provide no thermal protection

31
Q

An air conditioner needs to be selected.
Two types are available below, which one should be selected?

A) Has a sensible heat rating unit of 0.7
B) Has a sensible heat ratio of 0.9

A

B) Has a sensible heat ratio of 0.9

32
Q

A data center’s score is rated 3 in mechanical and rated 4 in electrical.
What is the overall rating of this data center?

A) It is rated 4, as that is the highest rating achieved
B) It is rated 3, as that is the lowest rating achieved
C) It is rated 4, as electrical is more important than mechanical
D) It depends on the score ratings in architecture and telecommunications

A

D) It depends on the score ratings in architecture and telecommunications

33
Q

You have 3 UPS systems connected in parallel. The UPS systems have an imbalance in their load of about 20%.
What do you recommend doing?

A) Do nothing, there is no reason for concern
B) Review the harmonics in the data center
C) Review the common mode noise level
D) Review the cable length of each UPS to the common bus

A

D) Review the cable length of each UPS to the common bus

34
Q

The computer room will be changed from the standard hot/cold aisle setup to a room with cold aisle containment.
What should be considered in this change?

A) No considerations should be required, as cold aisle containment only creates improvements
B) Cold aisle containment requires DX cooling to change to chilled water base cooling
C) Containment often requires the existing fire suppression system to be adjusted
D) Cold aisle containment requires the temperature on the power strips and rails to be reviewed

A

C) Containment often requires the existing fire suppression system to be adjusted

35
Q

You are installing new copper cabling,
What is the advantage or disadvantage of choosing pre-terminated CAT6 or 6A cabling?

A) There is no advantage
B) Pre-terminated cabling has a higher fire rating
C) Pre-terminated cabling is already factory tested and saves time on installation
D) Pre-terminated cabling makes ordering the cables more complicated

A

C) Pre-terminated cabling is already factory tested and saves time on installation

36
Q

A data center is located just above the artic circle in Winnipeg, the outdoor air temperature is never above 21 degrees Celsius.
Taking energy efficiency as your highest priority, what type of cooling system would you recommend?

A) Standard air-conditioning units and spare parts might not be easy to obtain
B) Water side economizers
C) Air side economizer
D) Any cooling system can be efficient

A

C) Air side economizer

37
Q

Your data center has high levels of H2S (Hydrogen-Sulfuric gas).
What is the best option to resolve this issue?

A) Install air scrubbers
B) Vacuum the whole room using a HEPA class filter
C) Clean the room and racks with a damp, wet cloth
D) Provide more air exchanges

A

A) Install air scrubbers

38
Q

What is a main disadvantage of using a top of rack design?

A) There are more switches to manage
B) A single top of row switch is more expensive than an end of row switch
C) You need a separate rack to install all of your top of rack switches
D) A top of rack switch has only optical interfaces

A

A) There are more switches to manage

39
Q

The data center requires an auditable fire order that complies with TIA 942, Rated-3 concurrent maintainability.
Will the network architecture be a part of this audit?

A) Yes
B) No

A

A) Yes

40
Q

You need to determine a strategy for your cooling audit, all the servers are based on front to rear airflow.
To which location would you go to measure temperature and what would you recommend for the audit?

A) To the back and rear of the server - 2 inches away
B) To the front intake of the server – 2 inches away
C) 1.5 meters above the floor in the middle of the cold aisle
D) 1.5 meters above the floor in the middle of the hot aisle

A

C) 1.5 meters above the floor in the middle of the cold aisle

41
Q

The building in which the computer room is housed is required to have a sprinkler. As such the building is equipped with a wet-pipe system.
What action, if any, would you recommend in the computer room?

A) Replace the wet pipe system with a deluge system
B) Replace the wet pipe system with a dry pipe system
C) Replace the wet pipe system with a pre-action system
D) Maintain the current wet-pipe system

A

C) Replace the wet pipe system with a pre-action system

42
Q

You are working on the design of a new facility, the electrical riser of the building with high current power is located close to the area where sensitive IT equipment in the datacenter will be located.
What would you recommend to reduce the amount of Electro-Magnetic Radiation (EMR) coming from the electrical riser?

A) Install single phase power cable
B) Install three-phase power cable
C) Install three-phase power cabling based on a combined cable would be installed busbar trunking
D) Busbar has the lowest amount of EMF radiation

A

D) Busbar has the lowest amount of EMF radiation

43
Q

A computer room with a raised floor has been designed in a hot/cold aisle set up for the racks.
Where would you recommend you place the air conditioners?

A) Perpendicular to the hot aisle
B) Perpendicular to the cold aisle
C) At both sides at the end of the row racks
D) The air conditioner placement has no effect

A

A) Perpendicular to the hot aisle

44
Q

When installing a raised floor, should you 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
B) No

A

B) No

45
Q

The maximum exposed area of fire rated glass found by the supplier is 25 square meters. The window area is 30 square meters. What would be your best option?

A) Don’t use fire rated glass
B) Split the window into two equal parts using an aluminum frame
C) Split the window into two pieces fitted together with transparent silicon glue
D) Split the window into parts smaller than the specified maximum area and ensure fire rated frames.

A

D) Split the window into parts smaller than the specified maximum area and ensure fire rated frames.

46
Q

What precautions should be taken for cabling leading into an equipment rack when the data center is in a seismically prone area.

A) Cables should be tightly organized into the rack to avoid movement
B) Cables can be organized in any way, it’s not important
C) Cables should be loosely organized to allow for movement and latched to the power plug
D) Cables should be replaced by busbar trunking

A

C) Cables should be loosely organized to allow for movement and latched to the power plug

47
Q

When are the wet-bulb and dry-bulb temperatures identical?

A) When the dry-bulb temperature is at its lowest allowable temperature
B) When the dry-bulb temperature is at its highest allowable temperature
C) When the relative humidity is at 100%
D) When the relative humidity is at the best practice value of 50%

A

C) When the relative humidity is at 100%

48
Q

The UPS of a datacenter with an ANSI-942 rating 4 is installed with its rectifier connected to the power feed A and the bypass reserve line is connected to power feed B. To which feed will the output of the UPS by synchronized?

A) You would synchronize it to the output of feed A
B) You would synchronize it to the output of feed B
C) It depends on the setting of the UPS
D) The UPS will not by synchronized to any of the feeds

A

A) You would synchronize it to the output of feed A

49
Q

Assume that an EMF shielding material needs to be installed as the EMF levels coming from the transformer room into the computer room are measured at 100mG (milligauss). The transformer room is about 10m (meters) away from the computer room and separated by a corridor.
Assuming there are no physical issues, where would you recommend shielding material to be installed?

A) As close as possible to the transformer room
B) As close as possible to the computer room
C) It doesn’t matter
D) Shielding is not required

A

B) As close as possible to the computer room

50
Q

What is a significant difference between a halocarbon gas based system and an inert gas based system?

A) Inert gas has smaller sized gas containers
B) Inert gas harms the environment and halocarbon gases do not
C) Halocarbon gas works on the basis of the oxygen reduction and inert gas works on the basis of heat removal
D) Halo carbon works on the basis of heat removal and inert gas works on the basis of oxygen reduction

A

D) Halo carbon works on the basis of heat removal and inert gas works on the basis of oxygen reduction

51
Q

What configuration of a surge protection device would you recommend for the incoming feed of a PDU?

A) Have a protection between each of the phases, each of the phases to the neutral, each of the phases to the ground and then from the neutral back to the ground.
B) Surge protection is not recommended for the incoming feed of a PDU
C) Between the phases from the ground to neutral

A

A) Have a protection between each of the phases, each of the phases to the neutral, each of the phases to the ground and then from the neutral back to the ground.

52
Q

What is the right equation for finding power?

A

Pf = Watt / VA

53
Q

What is the right equation for finding Watt(s)

A

Watt = Pf x VA

54
Q

When calculating attenuation factors for shielding, what is the equation?

A

A = 20Log (R/M)

A = Attenuation in dB
R = The real value measured
M = The Maximum acceptable value

55
Q

You have a low Delta-T at the back of the equipment, what could this be an indicator of?

A

Low Delta-T could be an indication of dust or obstructions inside the server

56
Q

What is CFM determined by?

A

CFM is predominantly determined by the internal fans of the equipment and is pre-determined
(most equipment use temperature regulated fans)

57
Q

What is the maximum acceptable value of EMF for humans to be exposed to on a regular basis?

A

The maximum acceptable value of EMF is 10 mG (milligauss)

CDCS (1 decks)

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