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DU0-001 Questions and Answers

Question # 6

Click the Exhibit.

In the exhibit, which component is represented by the box with the arrow?

A.

Alternator

B.

Switchgear

C.

Sub feed panel

D.

Automatic transfer switch

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Question # 7

Which external factor will affect the level of moisture in the data center?

A.

Outside temperature

B.

Outside barometric air pressure

C.

Outside air coming in to supplement cooling

D.

Chilled water being pumped down from the roof

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Question # 8

Which statement is true about humidity?

A.

If the relative humidity is zero, there is no water vapor present.

B.

As the air temperature decreases, its ability to hold water increases.

C.

If the relative humidity is 50%, the air is holding all the water vapor it can.

D.

The amount of water that can be contained in the room air is fixed regardless of the room temperature.

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Question # 9

The Ideal Gas Law governs the relationship of which three state variables? (Choose three.)

A.

Volume

B.

Viscosity

C.

Pressure

D.

Conductivity

E.

Temperature

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Question # 10

Which management strategy is concerned with returning to the normal service levels as defined in a negotiated service level agreement (SLA)?

A.

Incident management

B.

Change management

C.

Capacity management

D.

Availability management

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Question # 11

Which two statements are true of fiber cabling versus copper? (Choose two.)

A.

Fiber cable provides faster connection speeds.

B.

Fiber cable is not prone to electrical interference.

C.

Fiber cable is generally less expensive for shorter distances.

D.

Fiber cables are thicker than copper cables, but they weigh less.

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Question # 12

Which statement best describes how a row-oriented cooling architecture optimizes the operational efficiency within the data center?

A.

Row-oriented architecture allows cooling capacity to be matched to the heat load within each zone.

B.

Row-oriented architecture requires two cooling units per enclosure, creating a desirable oversizing scenario.

C.

Row-oriented architecture cools all rows of the data center while generating additional conditioned air for the adjacent office areas.

D.

Row-oriented architecture requires large volume of air mixing to reduce the return air temperature, driving up cooling system capacity.

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Question # 13

Which UPS topology switches to batteries and turns on the inverter when the utility fails?

A.

Rotary

B.

Standby

C.

Delta conversion

D.

Double conversion

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Question # 14

To formulate proper cooling patterns in data centers, how should racks be arranged?

A.

Alternating hot and cold aisles

B.

Organizing individual rows by application

C.

Placing hot spots in the corners of the room

D.

Segmenting hot aisles in one room and cold aisles in another

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Question # 15

Which two would cause a swell? (Choose two.)

A.

Ground fault interrupt

B.

Sudden load reductions

C.

Single-phase fault in a three-phase system

D.

Automatic transfer switch (ATS) transfer to secondary power

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Question # 16

Which represents the highest expense when pricing out a cabling solution?

A.

Delivery cost

B.

Installation cost

C.

Inventory and storage cost

D.

Patch cable maintenance cost

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Question # 17

What statement accurately describes the term "continuous load"?

A.

A load left on for 3 consecutive hours or more

B.

A load supported by a direct feed from the utility

C.

A load that supports a continuous run of 208 V cables

D.

A load that consists of components that support both AC and DC power

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Question # 18

In order to determine the exact level of redundancy available in the cooling system, which cooling architecture would require CFD analyses of every combination of system failures within the data center?

A.

Row

B.

Rack

C.

Room

D.

Ceiling

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Question # 19

Which describes an intelligent spot type smoke detector?

A.

Changes the tone of the alarm depending on the heat intensity of a fire

B.

Allows location-specific information to be sent to the central control station

C.

Regulates the amount of air entering the sensor chamber to minimize false alarms

D.

Uses wireless technology similar to RFID which requires fewer detectors per unit area

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Question # 20

What characteristic is common to all cooling architectures?

A.

Deployable with on a raised floor

B.

Top or bottom airflow configuration

C.

Cooling equipment occupies white space

D.

Easily adaptable with changes in infrastructure

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Question # 21

Which two does the network-critical physical infrastructure (NCPI) management system monitor at the rack level? (Choose two.)

A.

The monitoring of a chiller at the rack level.

B.

The monitoring of comfort cooling at the rack level.

C.

The monitoring of supplemental cooling devices at the rack level.

D.

The monitoring of rack based transfer switches at the rack level.

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Question # 22

What is the unit of measurement of the electrical current moving through a circuit?

A.

Volt

B.

Amp

C.

Ohm

D.

Frequency

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Question # 23

What defines a delta to wye transformer?

A.

Takes in three-phases and ground; outputs three-phases and ground

B.

Takes in three-phases, neutral, and ground; outputs three-phases and ground

C.

Takes in three-phases and ground; outputs three-phases, neutral, and ground

D.

Takes in three-phases, neutral, and ground; outputs three-phases, neutral, and ground

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Question # 24

Tracking achievement against agreed upon service levels is an example of which specific management process?

A.

Planned down time

B.

Infrastructure improvement

C.

Availability metrics reporting

D.

Advanced warning for failure

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Question # 25

Which statement describes the capability of a data cable installation?

A.

Category 5 cable can support 1 Gigabit Ethernet.

B.

Category 5e cable can support 1 Gigabit Ethernet

C.

Category 6a cable can support 10 Gigabit Ethernet.

D.

Category 6a cable can support 100 Gigabit Ethernet.

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Question # 26

Click the Exhibit button.

In the exhibit, which type of power problem is illustrated?

A.

DC offset

B.

Overvoltage

C.

Undervoltage

D.

Harmonic distortion

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Question # 27

MTTR is presented in which format?

A.

Hours

B.

Weight

C.

Fraction

D.

Distance

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Question # 28

Which type of application typically utilizes an enclosure wider than 600 mm?

A.

Network cabling

B.

Storage disk arrays

C.

Rack-mounted UPS

D.

Shelf-mounted tower servers

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Question # 29

Which three key components make up a three-phase stationary power distribution unit? (Choose three.)

A.

Rectifier

B.

Panel board

C.

Input transformer

D.

Rack mount bracket

E.

Input circuit breaker

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Question # 30

Which two choices would ease the maintenance and serviceability of equipment in a data center? (Choose two)

A.

Underfloor cabling

B.

Proper cable management

C.

Split rear doors to allow for easier access

D.

Unique enclosures to meet specific equipment needs

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Question # 31

What is an advantage of using a diesel fuel source for a standby generator?

A.

Cleaner burning fuel

B.

No fuel storage problems

C.

More hours of operation between engine overhauls

D.

Less engine preventative maintenance requirements

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Question # 32

What represents the optimum scenario for investing in network-critical physical infrastructure (NCPI) technologies?

A.

NCPI cost is low and the risk/cost of downtime is high.

B.

NCPI cost is high and the risk/cost of downtime is low.

C.

The projected cost of downtime has not yet been established.

D.

Oversize the initial NCPI investment to minimize the possibility of downtime.

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Question # 33

Why are frequency variations a small concern for data center managers?

A.

Frequency variation helps server performance.

B.

Computer power supplies are frequency tolerant.

C.

Frequency variation is strictly a theoretical problem.

D.

Frequency variation occurs during sag conditions, which the UPS resolves.

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Question # 34

What are three benefits of row-oriented cooling architecture? (Choose three.)

A.

Predictable cooling

B.

Ease of deployment

C.

No raised floor required

D.

Reduced sensible heat ratio

E.

Increased mixing of air streams

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Question # 35

Which type of rack / enclosure would you select if you wanted to rely on natural convection to dissipate heat from your equipment?

A.

Open frame rack

B.

Seismic enclosure

C.

Enclosure with perforated doors

D.

Enclosure with rack-mounted fans

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Question # 36

Which temperature range is optimal for the proper function of a data center?

A.

62-65F (17-18C)

B.

72-75F (22-24C)

C.

82-85F (28-29C)

D.

92-95F (33-35C)

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Question # 37

Which two characteristics do all static UPS topologies share? (Choose two.)

A.

A battery

B.

An inverter

C.

A transfer switch

D.

A single-phase input

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Question # 38

A co-location company invested huge amounts of capital to develop a solid, high security infrastructure and planned for "worse case" in terms of capacity.

What are two possible reasons this company failed? (Choose two.)

A.

They tied up unnecessary capital.

B.

The power capacity forecast was underestimated.

C.

They could not adapt to changing customer needs.

D.

They ran out of floor space to host additional clients.

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Question # 39

Given a constant voltage, as the amperage increases, what must happen to the cross-sectional area of a wire?

A.

It needs to be larger.

B.

It needs to be smaller.

C.

It decreases with the square of the current.

D.

Nothing, since the voltage has not changed.

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Question # 40

What are two causes of impulsive transients? (Choose two.)

A.

Lightning strikes

B.

Generator switch-over

C.

Air conditioner starting up

D.

Electrostatic discharge (ESD)

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Question # 41

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

A.

To increase the power factor as the load increases

B.

To increase harmonics by stepping down the output

C.

To regulate output voltage as the input voltage varies

D.

To provide low impedance for switched mode power supplies

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Question # 42

When monitoring humidity levels in the data center, where is the single most important place to measure the humidity?

A.

Above the rack

B.

Below the rack

C.

The air intake on IT equipment

D.

The exhaust air coming out of the back of the IT equipment

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Question # 43

What are two advantages that the isolated redundant configuration has over a capacity configuration? (Choose two.)

A.

The isolated redundant configuration has a lower operating cost than a capacity design.

B.

The isolated redundant configuration provides redundancy but the capacity configuration does not.

C.

The isolated redundant configuration can scale to larger capacities than the capacity configuration.

D.

The isolated redundant configuration allows multiple vendor UPSs. The capacity configuration must use the same UPS manufacturers.

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Question # 44

Which statement is a recognized characteristic of single-phase power?

A.

Single-phase power excludes the use of three-phase power in the data center.

B.

Single-phase power provides an effective means for delivering DC power to the data center.

C.

Single-phase power is an effective choice of power supply when data center users require large volumes of power.

D.

Single-phase power implies that power comes into the data center with one "hot" wire, along with accompanying neutral and ground.

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Question # 45

What are three power distribution components found in data centers? (Choose three.)

A.

Ground loop

B.

Branch circuit

C.

Metered outlet strip

D.

Power distribution unit (PDU)

E.

Valve regulated lead acid (VRLA) battery

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Question # 46

Which NCPI management technique specifically addresses the challenge of maintaining spare equipment at compatible firmware revision levels to avoid downtime?

A.

Change management

B.

Capacity management

C.

Reliability management

D.

Availability management

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Question # 47

Click the Exhibit button.

What does the shaded area in the exhibit represent?

A.

Deferred investment

B.

Waste due to oversizing

C.

Total redundant capacity

D.

Additional power needed

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Question # 48

What two characteristics can result in poor performance of network cables? (Choose two.)

A.

Tie wraps that are too tight

B.

Vertical cable management

C.

A bend radius that is too small

D.

An overhead deployment with cables run in troughs

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