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DU0-001 Data Center University Associate Certification Questions and Answers

Questions 4

What are two circuit breaker types found in a building or data center? (Choose two.)

Options:

A.

Thermal

B.

Magnetic

C.

Fast-acting

D.

Photovoltaic

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Questions 5

How can low humidity have a negative impact on the data center environment?

Options:

A.

It can create a static electricity discharge.

B.

It can create the potential for life threatening electric shock.

C.

It can decrease the sensible heat ratio of the air conditioner.

D.

It can accelerate the deterioration of internal system components.

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Questions 6

Click the Exhibit button.

This picture illustrates which type of cooling architecture?

Options:

A.

Rack

B.

Row

C.

Room

D.

Building

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Questions 7

What does the term "5-nines" availability mean?

Options:

A.

5 minutes of downtime per year

B.

9 minutes of downtime per year

C.

14 minutes of downtime per year

D.

45 minutes of downtime per year

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Questions 8

What is the most common direction of airflow through a rack mount blade server assembly?

Options:

A.

Side to side

B.

Front to back

C.

Back to front

D.

Bottom to top

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Questions 9

What is an advantage of hot aisle/cold aisle rack configuration?

Options:

A.

It prevents hot exhaust air from leaving the cold aisle.

B.

It prevents cold air from being drawn into the IT equipment intakes.

C.

It prevents exhaust air of one rack from being in the intake.

D.

It prevents hot exhaust air from reaching the computer room cooling units.

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Questions 10

Perimeter CRAC units discharge into the raised floor space, and perforated tiles exist in front of the IT equipment racks. No other air management devices are present in the space.

This is an example of which type of air distribution system?

Options:

A.

Flooded supply, flooded return

B.

Flooded supply, fully ducted return

C.

Flooded supply, locally ducted return

D.

Locally ducted supply, flooded return

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Questions 11

What is a component of the network-critical physical infrastructure (NCPI)?

Options:

A.

Voice over IP

B.

Fire protection

C.

Office supplies

D.

Desktop application software

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Questions 12

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

Options:

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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Questions 13

Click the Exhibit button.

What does the exhibit represent?

Options:

A.

UPS control panel

B.

Pneumatic door opener

C.

Emergency power off (EPO) button

D.

Fire suppression de-activation (FSD) button

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Questions 14

What is one positive effect of using standardized racks / enclosures that are universally compatible with vendors' equipment?

Options:

A.

Improved monitoring

B.

Increased load capacity

C.

Mixing of hot and cold air

D.

Decreased lifecycle costs

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Questions 15

What are two advantages of the distributed redundant UPS configuration? (Choose two.)

Options:

A.

It is the easiest configuration to manage.

B.

It uses dual power paths for dual corded servers.

C.

It has increased reliability by eliminating the static transfer switches (STS).

D.

Equipment can be maintained without transferring the load to the bypass.

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Questions 16

Click the Exhibit button.

Which type of power problem is shown in the exhibit?

Options:

A.

DC offset

B.

Interruption

C.

Undervoltage

D.

Harmonic distortion

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Questions 17

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

Options:

A.

Change management

B.

Capacity management

C.

Reliability management

D.

Availability management

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Questions 18

What is a common limiting factor when specifying a 48U rack / enclosure?

Options:

A.

Ceiling height

B.

Cable capacity

C.

Cooling requirements

D.

Enclosure door clearance

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Questions 19

Why is the claim that "product X is 99.99% reliable" inaccurate?

Options:

A.

No tier level has been stated.

B.

99.99% is theoretically impossible.

C.

A timeframe has not been provided.

D.

Reliability cannot be quantified to four significant digits.

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Questions 20

Why are dry chemical fire extinguishers a poor practice for data center fire protection?

Options:

A.

They set off smoke alarms.

B.

They are corrosive to IT equipment.

C.

They cause condensation on equipment.

D.

They are ineffective against electrical fires.

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Questions 21

Hot aisle containment systems serve which primary function?

Options:

A.

They enclose the top and bottom of racks to balance hot and cold air.

B.

They enclose the rear of racks to ensure mixing of hot and cold air.

C.

They enclose the front of racks to ensure reliable supply air delivery.

D.

They enclose the rear of racks to prevent mixing of hot and cold air.

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Questions 22

What are the three stages of combustion? (Choose three.)

Options:

A.

Incipient

B.

Back draft

C.

Thermal flux

D.

Intense heat

E.

Visible smoke

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Questions 23

What is the historical / traditional architecture of data center cooling?

Options:

A.

Rack

B.

Row

C.

Room

D.

Building

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Questions 24

Which two would be used for biometric access control? (Choose two.)

Options:

A.

Voice

B.

Fingerprint

C.

Smart cards

D.

Personal identification number

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Questions 25

What are two reasons for choosing enclosures with square holes and cage nuts? (Choose two.)

Options:

A.

Eases repair of mounting rails

B.

Eases installation

C.

Eases bolt alignment

D.

Eases enclosure stabilization

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Questions 26

What is the purpose of the governor as a primary component of a standby generator?

Options:

A.

Regulates output voltage and frequency

B.

Maintains constant RPM of the prime mover

C.

Converts mechanical energy from the prime mover into alternating current

D.

Receives a signal from the automatic transfer switch to initiate the start of the prime mover

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Questions 27

Which relative humidity range is considered optimal in data centers?

Options:

A.

25-40%

B.

40-55%

C.

55-70%

D.

70-85%

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Questions 28

Fluid coolers and pump packages are components of which heat rejection system?

Options:

A.

Chilled water system

B.

Water cooled system

C.

Glycol cooled system

D.

Air cooled self-contained system

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Questions 29

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

Options:

A.

Volume

B.

Viscosity

C.

Pressure

D.

Conductivity

E.

Temperature

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Questions 30

During a power outage, a retail store is likely to exhibit which cost of downtime profile?

Options:

A.

Cost of downtime per hour remains the same.

B.

Cost of downtime per hour increases with time.

C.

Cost of downtime per hour decreases with time.

D.

Cost of downtime per hour is exponential with time.

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Questions 31

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

Options:

A.

Rectifier

B.

Panel board

C.

Input transformer

D.

Rack mount bracket

E.

Input circuit breaker

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Questions 32

How does a rack-mounted side air distribution unit improve air flow?

Options:

A.

It pulls air from cold aisles and directs it to side equipment inlets.

B.

It pulls air from the sides of the enclosure and directs it through the top.

C.

It pulls air from the sides of the enclosure and directs it to the hot aisles.

D.

It pulls air from the raised floor and directs it through the sides of the enclosure.

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Questions 33

What defines a delta to wye transformer?

Options:

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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Questions 34

What is the purpose of the alternator as a primary component of a standby generator?

Options:

A.

Starts the prime mover upon loss of utility power

B.

Controls output voltage reference produced by the prime mover

C.

Converts mechanical energy from the prime mover into electrical current

D.

Maintains constant RPM of the prime mover under a variety of conditions by adjusting the fuel that feeds the prime mover

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Questions 35

The power cable should be marked, at minimum, with which two pieces of information? (Choose two.)

Options:

A.

The source PDU

B.

The date installed

C.

The circuit breaker it is fed from

D.

The voltage capacity of the cable

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Questions 36

Which type of humidification system rapidly vibrates water to create a fog or mist that is introduced into the air?

Options:

A.

Infrared humidifier

B.

Ultrasonic humidifier

C.

Electromagnetic humidifier

D.

Steam canister humidifier

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Questions 37

Click the Exhibit button.

Which air distribution method is displayed in the exhibit?

Options:

A.

Flooded supply, flooded return

B.

Flooded supply, fully ducted return

C.

Flooded supply, locally ducted return

D.

Locally ducted supply, flooded return

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Questions 38

Undervoltage is a more technically accurate term to describe what event?

Options:

A.

Blackout

B.

Brownout

C.

Power drought

D.

Power suppression

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Questions 39

Click the Exhibit.

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

Options:

A.

Alternator

B.

Switchgear

C.

Sub feed panel

D.

Automatic transfer switch

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Questions 40

What is the primary purpose of a UPS?

Options:

A.

To remove transients from the power path

B.

To detect and report power factor problems

C.

To provide battery backup power should the utility fail

D.

To convert from three-phase power to Single-phase power

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Questions 41

In network data cabling, what is currently the medium of choice for short cable runs?

Options:

A.

Arcnet

B.

Copper

C.

Ethernet

D.

Twisted pair

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Questions 42

What are three components of power distribution? (Choose three.)

Options:

A.

Flexible conduit

B.

Circuit / branch circuit

C.

Automatic Transfer Switch (ATS)

D.

Uninterruptible Power Supply (UPS)

E.

Ground Loop

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Questions 43

What is an advantage of using natural gas as a fuel source for a standby generator?

Options:

A.

Reduced fire hazard

B.

Easy on-site storage

C.

Minimum carbon build-up

D.

More hours of operation between overhauls

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Questions 44

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

Options:

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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Questions 45

Which UPS topology is most commonly used to protect small business and departmental servers where voltage regulation is required?

Options:

A.

Standby

B.

Line interactive

C.

High-speed relay

D.

Delta conversion online

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Questions 46

What is a property of heat transfer?

Options:

A.

Heat is destroyed.

B.

Heat is transferred in the direction from hot to cold.

C.

Heat is transferred in the direction from cold to hot.

D.

Heat is transferred in both directions (hot to cold and cold to hot).

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Questions 47

What is a difference between Single-phase and three-phase power?

Options:

A.

Single-phase power is flat but three-phase power is sinusoidal.

B.

Single-phase power is dependent on power factor but three-phase power is not.

C.

Single-phase power is limited to approximately 120 kW but three-phase power is unlimited.

D.

Single-phase power is more costly for the power company to distribute than three-phase power.

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Questions 48

Cooling towers are a typical component of which heat rejection system?

Options:

A.

Water cooled system

B.

Glycol cooled system

C.

Air cooled split system

D.

Air cooled self-contained system

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Exam Code: DU0-001
Exam Name: Data Center University Associate Certification
Last Update: May 18, 2024
Questions: 324

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