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DU0-001
Data Center University Associate Certification Questions and Answers

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Viewing page 2 out of 10 pages

Viewing questions 11-20 out of questions

Questions # 11:

What are the four operating modes of CRAC units?

Options:

Cooling, heating, saturation, humidification

Cooling, heating, dehumidification, saturation

Cooling, heating, humidification, dehumidification

Cooling, humidification, dehumidification, saturation

Answer

Questions # 12:

Requiring frequent password changes can compromise security because _____.

Options:

Users tend to write down frequently changed passwords

It makes the password database an easier target for hackers

It makes it harder for legitimate users to access their own data

It burdens the IT help desk with requests for forgotten or expired passwords

Answer

Questions # 13:

Which scenario illustrates a data center's agility?

Options:

A data center is built out to final design capacity.

A data center is designed with one hour of runtime.

A data center is designed with interchangeable power distribution.

A data center is configured with 50% AC power and 50% DC power in anticipation of loads.

Answer

Questions # 14:

A UPS system consists of three modules in a parallel redundant configuration. Each module is rated to provide 200 kW of power. If the electrical load grows from 350 kW to 420 kW, what will happen?

Options:

The UPS system will not provide any additional power beyond 400 kW.

The UPS system will reach an overload state and switch to its static bypass.

The UPS system's response will vary depending on the rate of electrical load growth.

The UPS system will continue to support the load and become a capacity configuration.

Answer

Questions # 15:

What is a function of a transformer in a line interactive UPS?

Options:

To increase the power factor as the load increases

To increase harmonics by stepping down the output

To regulate output voltage as the input voltage varies

To provide low impedance for switched mode power supplies

Answer

Questions # 16:

What is the advantage of a three-phase power source versus a single-phase power source?

Options:

Three-phase power delivers balanced voltage across all three-phases.

Three-phase power delivers up to three times the amount of power of a single-phase power source.

Three-phase power cancels neutral harmonics on the 3rd, 5th, and 7th orders where Single-phase power does not.

Three-phase power does not require a neutral; therefore, you can attain increased levels of efficiency over single-phase power.

Answer

Questions # 17:

Physical security can be increased by which three activities? (Choose three.)

Options:

Adding more IT personnel

Adding live security guards

Changing from smart cards to bar code badges

Adding concentric security zones to increase "depth of security"

Adding password or fingerprint verification at a card-reading checkpoint

Answer

B, D, E

Questions # 18:

Which cooling architecture attempts to eliminate hot spots within the data center by utilizing large volumes of air mixing throughout the space?

Options:

Row

Rack

Room

Ceiling

Answer

Questions # 19:

What is the primary difference between double conversion and delta conversion UPS systems?

Options:

Double conversion UPSs require a 1.3X generator oversizing. Delta conversion UPSs require a 3X generator oversizing.

Double conversion UPSs are practical in size ranges from 0 - 20 kW. Delta conversion UPSs are practical in size ranges of 20 kW to 1 MW.

In a double conversion UPS, 100% of the power is converted from AC to DC and then again from DC to AC. In a delta conversion UPS, only the difference between input and output power is converted.

In a double conversion UPS, the transformer has a special ferro-resonant capability, which provides limited voltage regulation and output waveform shaping. In a delta conversion UPS, a standard transformer is used.

Answer

Questions # 20:

What are the three basic physical security categories that describe technologies for personnel identification? (Choose three.)