Actual CDCS Exam Recently Updated Questions with Free Demo [Q28-Q46]

QUESTION 28
Is it allowed to make design changes during the implementation phase?

No, after a design freeze no further changes are allowed.

Any change is fine as long as it is within the scope of the project.

Yes, but only when time to implement is not exceeded.

Only when there is a strong business and/or technical justification.

QUESTION 29
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?

Standard air conditioning units, as spares might not be readily available

Any cooling system can be efficient because the outside air temperature will not influence the temperature of the air intake of the ICT equipment

Waterside economizer

Airside economizer

QUESTION 30
You have three UPS systems connected in parallel. The UPS systems have an imbalance in the load sharing of approximately 20%.
What should you recommend?

Review the cable lengths of each UPS to the common busbar

Nothing, there is no reason for any concern

Review the common mode noise levels within the computer room

Review the harmonics levels within the computer room

QUESTION 31
Smoke sensors need to be tested to ensure that they pick up a potential fire in the data center.
What should you recommend?

Test the sensors by injecting smoke or simulated smoke directly into the sensor

Press the self-test button on each sensor in the data center

Inject smoke at the floor level

Test the sensors according to the vendor specification

QUESTION 32
The building in which the computer room is housed is required to have a sprinkler system. The building is therefore equipped with a wet pipe system.
What action, if any, should you recommend for the computer room?

Maintain the current wet pipe system.

Replace the wet pipe system with a deluge system.

Replace the wet pipe system with a dry pipe system.

Replace the wet pipe system with a pre-action system.

QUESTION 33
An MCB needs to be installed in the PDU of an air-conditioner unit.
Which breaking curve should you select?

D-Curve

C-Curve

B-Curve

A-Curve

QUESTION 34
When installing a raised floor, can we use a spirit level bar to level the floor?

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).

No, because using a spirit level bar, a measurement error will be transferred from pedestal to pedestal.

Yes, but spirit level bars can only be used in the vertical plane.

Yes, using a spirit level bar for raised floors higher than 40 cm is preferred.

QUESTION 35
What is the main reason to install Earth Leakage protection?

Protection of ICT equipment against high-frequency noise currents

Protection of human lives

Improvement of the data center grounding/earthing system

Protection against lightning strikes

QUESTION 36
You are changing the design of the fire suppression system for your computer room from a halocarbon fire suppression system into an inert-based fire suppression system. Could you use the same formula to calculate the gas content for the gas?

No, there is a significant difference in the formula for the different types of fire suppression gases.

Yes, as long as you take the difference between the net and gross volume into account.

Yes, as long as you use the same units of measure, i.e., kg/m³ or lbs/ft³.

Yes, as long as you change the ‘S’ factor of the formula to reflect the gas type used.

QUESTION 37
Which formula is correct?

Phase-to-Neutral Voltage = Phase-to-Phase voltage * 1.732

Phase-to-Neutral Voltage = Phase-to-Phase voltage /1.732

Phase-to-Neutral Voltage = Phase-to-Neutral voltage * 1.732

Phase-to-Neutral Voltage = (Phase-to-Phase voltage * 1.732) / Phase-to-Neutral Voltage

QUESTION 38
What is the minimum requirement for the power feeds to the building for a Rated-3 data center based on the ANSI/TIA-942 standard?

Two feeds coming from two different substations, one power company is not acceptable

Two feeds coming from two different substations, one power company is acceptable

Two feeds entering the data center building from one substation

One feed from one substation split over two separated distribution boards in separate rooms

QUESTION 39
What is the calculation for the desired attenuation factor for shielding material?

A = 20 log (M / R)
Where A is Attenuation M is the maximum acceptable value R is the real value measured

A = M / R
Where A is Attenuation M is the maximum acceptable value R is the real value measured

A = 20 log (R / M)
Where A is Attenuation R is the real value measured M is the maximum acceptable value

You do not have to calculate the attenuation factor for shielding material as it always has the same attenuation

QUESTION 40
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 computer room will be located.
What should you recommend to reduce the amount of EMF coming from the electrical riser?

Install single-phase power cabling

Install three-phase power cabling based on three individual core wires

Install bus bar trunking

Install three-phase power cabling based on a combined cable (e.g. XLPE etc.)

QUESTION 41
You are allowed to use a calculator for this question. The total power consumption of the ICT equipment in a rack is 6 kW. The equipment is traditional ICT equipment with a Delta-T of approximately 11 °C / 20 °F. Calculate the approximate CFM required to cool the equipment in the rack.

Approximately 1,500 CFM

Approximately 1,000 CFM

Approximately 500 CFM

Approximately 160 CFM

QUESTION 42
What indicates the breaking capacity of a fuse or breaker?

Mechanical strength of the casing of a fuse or breaker.

The maximum voltage, in case of an electrical surge, that the fuse or breaker can handle without being destroyed or causing an electric damaging arc.

The current at which the device will trip.

The current that a fuse or breaker is able to interrupt without being destroyed or causing an electric damaging arc.

QUESTION 43
In order to save energy, you are going to install an automated system to switch off lights. What should be taken into consideration when installing such a system?

It is not advisable to use such a system since it will reduce the lifetime of LED lighting.

At all times, the levels should allow for security cameras to function properly.

The system should not be based on motion detection as the lights might suddenly switch off while staff is still at work.

Security guards should perform regular inspections verifying the system works.

QUESTION 44
The data center has been in operation for about 1 year and 2 months. The dust levels in the computer room are relatively high.
What is the most likely root cause?

The cleaning crew is not doing their work properly

Every computer room has high dust levels due to constant high-speed air movement

Low pressure in the computer room

Floorboards are most likely not fitted correctly

QUESTION 45
What is the advantage or disadvantage of using MPO (Multi-fiber Push On)/pre-terminated fiber?

There is no advantage, as it cannot be used with OM4 optical fiber cables.

There is no advantage, as it creates additional heat load in the data center.

It speeds up installation and provides an easy upgrade to transmission speeds up to 40 Gbit/s -100 Gbit/s.

It is a very flexible system as it can be used for both copper cables and optical fiber cables.

QUESTION 46
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?

The amount of gas required will be higher

The amount of gas required will not change

The amount of gas required will be lower

The change to the amount of gas cannot be determined without knowing the change in humidity as well

Actual CDCS Exam Recently Updated Questions with Free Demo [Q28-Q46]

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