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DU0-001 Practice Exam Questions and Answers

Data Center University Associate Certification

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Total Questions : 324

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Question # 1

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

Discussion 0
Question # 2

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.)

Options:

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.

Discussion 0
Question # 3

How does the parallel redundant UPS configuration differ from an isolated redundant UPS configuration?

Options:

A.  

A parallel redundant configuration is considered N+1 and an isolated redundant configuration is considered 2N.

B.  

A parallel redundant configuration requires a static bypass switch and an isolated redundant configuration does not.

C.  

A parallel redundant configuration eliminates downstream single points of failure and an isolated redundant configuration does not.

D.  

A parallel redundant configuration requires models of the same capacity from the same manufacturer and isolated redundant does not.

Discussion 0
Question # 4

Which three preventative maintenance activities are required to ensure reliability of a standby generator and automatic transfer switch? (Choose three.)

Options:

A.  

Take coolant samples.

B.  

Perform a thermal scan.

C.  

Perform a diagnostic on the rectifier.

D.  

Perform an inverter voltage regulation check.

E.  

Perform a trip setting check of all major circuit breakers.

Discussion 0
Question # 5

What is the primary feature of a smart card?

Options:

A.  

A picture

B.  

A bar code

C.  

A silicon chip

D.  

An expiration date

Discussion 0
Question # 6

What is a fundamental purpose of a step-up or step-down transformer?

Options:

A.  

Supply a neutral reference on the secondary side that is different than what is supplied on the primary side.

B.  

Supply a ground reference on the secondary side that is different than what is supplied to the primary side.

C.  

Deliver a voltage reference on the secondary side of the transformer different than what is supplied to the primary side.

D.  

Deliver the same voltage reference on the secondary side of the transformer equal to that supplied on the primary side.

Discussion 0
Question # 7

Click the Exhibit button.

Question # 7

This picture illustrates which type of cooling architecture?

Options:

A.  

Hybrid

B.  

Row

C.  

Rack

D.  

Room

Discussion 0
Question # 8

What is the load per rack where the room cooling architecture starts to become impractical?

Options:

A.  

1 kW

B.  

3 kW

C.  

7 kW

D.  

10 kW

Discussion 0
Question # 9

What are three advantages of biometric access control? (Choose three.)

Options:

A.  

Cannot be lost

B.  

Inexpensive to deploy

C.  

Difficult to fool the sensor

D.  

Cannot be shared with others

E.  

Always correctly identifies the user

Discussion 0
Question # 10

Which specific incident management challenge does the system-level view of the relationship between interconnected components help identify?

Options:

A.  

Incident urgency

B.  

Resolution owner

C.  

Problem location

D.  

Proper corrective action

Discussion 0
Question # 11

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

Options:

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.

Discussion 0
Question # 12

Which network topology does IEEE 802.3 UTP/STP Ethernet use?

Options:

A.  

Star

B.  

Ring

C.  

Tree

D.  

Wheel

Discussion 0
Question # 13

What is the highest cost UPS configuration?

Options:

A.  

System + system

B.  

Parallel redundant

C.  

Isolated redundant

D.  

Distributed redundant

Discussion 0
Question # 14

Which statement describes a difference between fiber and copper cabling?

Options:

A.  

Signals transmit further over fiber than copper.

B.  

Fiber is prone to electrical interference but copper is not.

C.  

Copper is more fragile than fiber when laying cable runs.

D.  

Signals over copper can travel at speeds approaching the speed of light.

Discussion 0
Question # 15

What is a common concern when specifying the depth of a rack / enclosure?

Options:

A.  

Seismic zone

B.  

Server dimensions

C.  

Available mounting units

D.  

Ambient room temperature

Discussion 0
Question # 16

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

Discussion 0
Question # 17

Which type of humidification system uses quartz lamps extended over an open pool of water to release water vapor?

Options:

A.  

Infrared humidifier

B.  

Ultrasonic humidifier

C.  

Electromagnetic humidifier

D.  

Steam canister humidifier

Discussion 0
Question # 18

What is a limiting factor when specifying the height of a rack / enclosure?

Options:

A.  

Cable capacity

B.  

Cooling requirements

C.  

Overhead fire sprinklers

D.  

Enclosure door clearance

Discussion 0
Question # 19

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

Options:

A.  

Cleaner burning fuel

B.  

No fuel storage problems

C.  

More hours of operation between engine overhauls

D.  

Less engine preventative maintenance requirements

Discussion 0
Question # 20

In order to determine the most appropriate UPS configuration for your business, which two factors should be considered? (Choose two.)

Options:

A.  

How long recovery from failure will take

B.  

How many employees will support the UPS

C.  

How much money is budgeted for IT equipment

D.  

How much money is flowing through the company every minute

Discussion 0
Question # 21

What is the greatest physical threat to a data center?

Options:

A.  

Fire

B.  

Dust

C.  

Water

D.  

People

Discussion 0
Question # 22

Which component of a line interactive UPS increases its battery life?

Options:

A.  

Dual mains input

B.  

Voltage regulating transformer

C.  

Low impedance DC disconnect

D.  

High impedance battery charge circuit

Discussion 0
Question # 23

Which two should be used as a basis for determining the UPS redundancy configuration? (Choose two.)

Options:

A.  

Voltage level

B.  

Cost of downtime

C.  

Availability requirements

D.  

Size of the electrical load

Discussion 0
Question # 24

What function do patch panels serve in a data center?

Options:

A.  

They convert Internet protocols (IP).

B.  

They convert copper signals into fiber optic light signals.

C.  

They serve as a demarcation point where ends of bulk cable converge.

D.  

They improve the data cable signal capacity from 100 Base-T to 10 Gigabyte Ethernet.

Discussion 0
Question # 25

What is the actual vertical hole spacing (center-to-center) based on the EIA-310 standard for one mounting unit or U?

Options:

A.  

25.40 mm (1 inch)

B.  

50.80 mm (2 inches)

C.  

38.10 mm (1.5 inches)

D.  

44.45 mm (1.75 inches)

Discussion 0
Question # 26

Typical data centers function to what percent of their capacity?

Options:

A.  

10%

B.  

33%

C.  

66%

D.  

75%

Discussion 0
Question # 27

Which fire suppression device uses a solder or glass bulb valve fuse?

Options:

A.  

Water sprinkler

B.  

Fire extinguisher

C.  

Water mist system

D.  

Gas flooding system

Discussion 0
Question # 28

Which two describe an air sampling smoke detection system? (Choose two.)

Options:

A.  

It is made up of a network of pipes.

B.  

It uses magnetic resonance imaging.

C.  

It is generally located in wiring closets.

D.  

It automatically compensates for changing environments.

Discussion 0
Question # 29

A previously built data center inherited the existing wet pipe sprinkler system. There are smoke detectors in the data center and the local authority having code jurisdiction mandates a sprinkler system in the data center.

How can you further protect the data center's IT equipment while meeting the mandated requirements?

Options:

A.  

Replace the wet-pipe sprinkler system with a FM-200 system.

B.  

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

C.  

Install linear heat detectors along the cable trays in addition to the existing sprinkler system.

D.  

Install heat detectors next to each of the sprinkler heads and then connect them to the fire control panel.

Discussion 0
Question # 30

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

Discussion 0
Question # 31

Which statement illustrates a characteristic of nominal voltage?

Options:

A.  

Nominal voltage is the voltage reference published by the power company.

B.  

In most geographies, nominal voltage is fixed at either 380 V or 460 V.

C.  

Nominal voltage is calculated based upon the load characteristics of the end user.

D.  

Nominal voltage is the voltage that is supplied to the building and factors in power distribution losses.

Discussion 0
Question # 32

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.

Discussion 0
Question # 33

Standby generators typically use which type of engine?

Options:

A.  

Rotary

B.  

Turbine

C.  

Two-stroke

D.  

Four-stroke

Discussion 0
Question # 34

In which heat rejection system is the compressor located outside of the CRAC unit?

Options:

A.  

Chilled water systems

B.  

Water cooled systems

C.  

Glycol cooled systems

D.  

Air cooled self-contained systems

Discussion 0
Question # 35

What allows you to support single-corded loads in a 2N UPS redundant configuration?

Options:

A.  

DC disconnect

B.  

Transfer switch

C.  

Static bypass switch

D.  

Wrap around external bypass

Discussion 0
Question # 36

Which statement correctly defines direct current (DC)?

Options:

A.  

Only high voltage is used.

B.  

Electricity flows in one direction only.

C.  

The circuit does not have multiple paths.

D.  

The circuit is directly attached to the power source.

Discussion 0
Question # 37

What is an example of a standard building management system (BMS) protocol?

Options:

A.  

IPV6

B.  

TCP/IP

C.  

MODBUS

D.  

10/100 BASE-T

Discussion 0
Question # 38

A coded lock is an example of which general type of access control?

Options:

A.  

Who you are

B.  

Where you are

C.  

What you have

D.  

What you know

Discussion 0
Question # 39

Which method transfers heat through the movement of a liquid or gas?

Options:

A.  

Radiation

B.  

Convection

C.  

Conduction

D.  

Evaporation

Discussion 0
Question # 40

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

Discussion 0
Question # 41

According to the Ideal Gas Law, what happens to the temperature and pressure inside an aerosol can that is being sprayed?

Options:

A.  

Temperature and pressure both increase.

B.  

Temperature and pressure are decreased.

C.  

Temperature and pressure are unchanged.

D.  

Temperature is unchanged and pressure is decreased.

Discussion 0
Question # 42

Your data center has a 75 kW load and is located in a building that would require long distances between the indoor and outdoor cooling units. There is no cooling tower available and reducing capital cost is a priority.

Which heat rejection method should be used?

Options:

A.  

Chilled water system

B.  

Water cooled system

C.  

Glycol cooled system

D.  

Air cooled split system

Discussion 0
Question # 43

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.

Discussion 0
Question # 44

What describes the ratio of watts to volt-amps?

Options:

A.  

Frequency

B.  

Power factor

C.  

Actual power

D.  

Apparent power

Discussion 0
Question # 45

Which two are characteristics of an agile data center? (Choose two.)

Options:

A.  

Provision a UPS module with a different power capacity.

B.  

Change out plug types when new IT equipment is installed.

C.  

Design for "worse case" capacity to prevent future downtime.

D.  

Have N+1 redundancy in part of the data center and 2N in another part based on equipment criticality.

Discussion 0
Question # 46

Which statement describes a three-phase power source?

Options:

A.  

Two voltage sine wave references consisting of two "hot" wires and a ground

B.  

One voltage sine wave reference consisting of a "hot" wire, a neutral wire, and a ground

C.  

Three voltage sine wave references consisting of one "hot" wire, one neutral wire, and a ground

D.  

Three voltage sine wave references consisting of three "hot" wires and accompanying neutral and a ground

Discussion 0
Question # 47

What would be a comprehensive strategy for protecting the most critical racks of a data center?

Options:

A.  

Key access to the critical racks

B.  

Video camera pointed directly at critical racks

C.  

Iris scanner at the entrance to the data center

D.  

Nested security perimeters with racks at the innermost level

Discussion 0
Question # 48

Which statement describes the system + system redundant configuration?

Options:

A.  

Identical UPS systems are required.

B.  

It is the most expensive configuration.

C.  

Only single corded loads can be supported.

D.  

Design capacities are much smaller than other configurations.

Discussion 0
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