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APC DU0-001 Data Center University Associate Certification Exam Practice Test

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Total 325 questions

Data Center University Associate Certification Questions and Answers

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Question 1

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.

Question 2

In three-phase power, by how many degrees are the three basic power waveforms offset?

Options:

A.

60

B.

90

C.

120

D.

180

Question 3

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.

Question 4

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.

Question 5

The rear of an IT equipment rack is fitted with a duct that is connected to a drop ceiling plenum; the plenum is connected by a duct to the perimeter CRAC unit. The CRAC unit discharges air into a raised floor. The IT equipment rack is located above a hole in the raised floor which allows conditioned air to enter the rack.

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

Options:

A.

Flooded supply, fully ducted return

B.

Locally ducted supply, flooded return

C.

Flooded supply, locally ducted return

D.

Fully ducted supply, fully ducted return

Question 6

What characterizes the effect of high humidity levels in the data center?

Options:

A.

High humidity causes long term corrosion damage to data center equipment.

B.

The extent of corrosion damage depends upon average ambient temperature.

C.

The extent of corrosion damage depends upon the dry airflow pattern in the data center.

D.

High humidity causes immediate corrosion damage to equipment within the data center.

Question 7

How do blanking panels improve cooling within an enclosure?

Options:

A.

By increasing the mixture of hot and cold air

B.

By increasing air intake through vented doors

C.

By directing exhaust heat into IT equipment intakes

D.

By limiting the recirculation of air into IT equipment

Question 8

What are two key characteristics of a UPS? (Choose two.)

Options:

A.

It tests voltages on IT equipment.

B.

It safeguards data in the event of a power loss.

C.

It measures energy consumption of IT equipment.

D.

It transfers IT equipment from utility to battery power.

Question 9

Seismic enclosures are designed to protect installed equipment from what hazards?

Options:

A.

Earthquakes

B.

Liquids

C.

Dusty environments

D.

Fire or excessive heat

Question 10

Based on individual network IP addresses, an enterprise management system (EMS) handles which type of information?

Options:

A.

Device centric

B.

Network centric

C.

Element centric

D.

Data point centric

Question 11

What is the main function of a UPS?

Options:

A.

To provide battery back-up power to IT equipment

B.

To regulate the voltage of power going to the racks

C.

To distribute power from the transformer to the racks

D.

To supply diesel-generated power when the utility is out

Question 12

Which two clean agents are commonly specified for data center fire suppression? (Choose two.)

Options:

A.

Inergen

B.

FE-130

C.

FM-200

D.

Halon 1211

Question 13

Which scenario illustrates a data center's agility?

Options:

A.

A data center is built out to final design capacity.

B.

A data center is designed with one hour of runtime.

C.

A data center is designed with interchangeable power distribution.

D.

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

Question 14

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

Question 15

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

Options:

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.

Question 16

What aspect of standby power generation is highly regulated by governmental bodies?

Options:

A.

Emissions

B.

Physical size

C.

Output voltage

D.

Fuel consumption

Question 17

Which access control method is an example of "who you are"? (Choose three.)

Options:

A.

Iris scan

B.

Fingerprint

C.

Voice recognition

D.

Badge with photo

E.

Employee ID number

Question 18

What is the function of a circuit breaker?

Options:

A.

To distribute power from the UPS to critical loads

B.

To filter harmonics caused by non-power factor corrected computer loads

C.

To protect electrical equipment from damage caused by overload or short circuit

D.

To balance the loads in the data center to prevent stray currents on the ground wire

Question 19

Which describes an intelligent spot type smoke detector?

Options:

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

Question 20

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:

A.

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

B.

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

C.

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

D.

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

Question 21

What are three core components of a standby generator? (Choose three.)

Options:

A.

Inverter

B.

Rectifier

C.

Governor

D.

Alternator

E.

Prime mover

Question 22

What is the greatest physical threat to a data center?

Options:

A.

Fire

B.

Dust

C.

Water

D.

People

Question 23

What is an advantage of choosing a four-post open frame rack over a two-post open frame rack?

Options:

A.

Lower cost

B.

Smaller footprint

C.

Easier assembly

D.

Increased strength

Question 24

What makes network-critical physical infrastructure (NCPI) management different from traditional building management systems?

Options:

A.

Availability of safety resources

B.

Safety of the people in the building

C.

Availability of computing resources

D.

Comfort of the people in the building

Question 25

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

Question 26

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

Options:

A.

It reduces CRAC fan power required.

B.

It utilizes the entire rated CRAC capacity.

C.

It eliminates the need for humidity control.

D.

It is easy to deploy for high density applications.

E.

It reduces the number of air conditioning devices.

Question 27

Which solution would remedy a power interruption?

Options:

A.

UPS

B.

Power line conditioner

C.

Power factor corrected power supply

D.

Transient voltage surge suppressor (TVSS)

Question 28

What defines a sub-panel?

Options:

A.

An enclosure consisting of buss-bars and circuit breakers located at the service entrance to a building B. An enclosure consisting of buss-bars and circuit breakers with the fundamental purpose of distributing power to receptacles and the load

B.

An enclosure consisting of buss-bars and circuit breakers designed to accept two sources of power and operate as a best source selector

C.

An enclosure consisting of buss-bars and draw-out circuit breakers with the fundamental purpose of distributing power to branch distribution panels

Question 29

Which statement describes a key characteristic of humidity?

Options:

A.

Air temperature does not affect air water vapor content.

B.

As temperature increases, the air can hold more water vapor.

C.

As the temperature increases, the air can hold less water vapor.

D.

As the temperature decreases, the air can hold more water vapor.

Question 30

What are two primary questions that any good physical security system should consider regarding any visitor to the data center?

Options:

A.

"Who are you?" and "Why are you here?"

B.

"Who are you?" and "Where are you going?"

C.

"Why are you here?" and "Where did you come from?"

D.

"Where did you come from?" and "Where are you going?"

Question 31

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

Question 32

What is an advantage of a large floor mount systems?

Options:

A.

Plugs into wall outlets

B.

Highest capacity units

C.

Rapid redeployment to a different location

D.

Does not take away from IT equipment space

Question 33

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

Question 34

Which three critical functions does grounding serve for a standby generator? (Choose three.)

Options:

A.

Prevents harmonics from affecting the IT load

B.

Provides a low-impedance electrical return path

C.

Prevents electrical shock during maintenance and/or repair

D.

Serves as a reference signal to the automatic transfer switch

E.

Ensures circuit breakers trip before electrical malfunctions develop into fires

Question 35

According to the Ideal Gas Law, what happens to the pressure when the temperature is increased and the volume is held constant?

Options:

A.

The pressure does not change.

B.

The pressure initially increases and then decreases.

C.

The pressure increases.

D.

The pressure decreases.

Question 36

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

Question 37

A power line conditioner can compensate for which two events?

Options:

A.

DC offset

B.

Interruptions

C.

Current increases

D.

Voltage fluctuations

Question 38

What is the definition of reliability?

Options:

A.

The fraction of time a system is unable to perform its intended function.

B.

The likelihood that a system failure will occur for a specified time range.

C.

The ability of a system to perform its required functions for a specified period of time.

D.

The degree to which a system is accessible when required for use at an instant in time.

Question 39

Which method of heat transfer causes electromagnetic waves?

Options:

A.

Radiation

B.

Convection

C.

Conduction

D.

Evaporation

Question 40

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

Question 41

Click the Exhibit button.

This picture illustrates which type of cooling architecture?

Options:

A.

Hybrid

B.

Row-oriented

C.

Rack-oriented

D.

Room-oriented

Question 42

Which type of multimode fiber is commonly used to support longer runs of 10 Gigabit Ethernet?

Options:

A.

9/125 rapid grade

B.

62.5/125 FDDI grade

C.

50/125 laser optimized

D.

25/125 AWG optimized

Question 43

What are the three basic principles of identification from LEAST secure (1) to MOST secure (3)?

Options:

A.

(1) what you know, (2) what you have, (3) who you are

B.

(1) what you know, (2) who you are, (3) what you have

C.

(1) what you have, (2) who you are, (3) what you know

D.

(1) what you have, (2) what you know, (3) who you are

Question 44

What is an indirect cost of downtime that is difficult to quantify?

Options:

A.

Legal fees

B.

Lost revenues

C.

Idle employees

D.

Damaged brand perception

Question 45

Why will touching a doorknob after walking across a carpet only cause a slightly painful spark, but touching a live utility wire inside the data center could cause death?

Options:

A.

The utility company's voltage is much higher than that of the spark.

B.

The spark generates DC power but the utility company generates AC power.

C.

The current available from a spark is much less than the current available from the utility company.

D.

The human skin has a high enough resistance to keep from being hurt from the spark's voltage but not from the utility company's voltage.

Question 46

What is required for the transfer of heat from one object to another?

Options:

A.

A difference in airflow

B.

A difference in volume

C.

A difference in pressure

D.

A difference in temperature

Question 47

Which UPS topology uses a transfer switch between the primary power source and the inverter?

Options:

A.

Standby

B.

High speed relay

C.

Delta conversion online

D.

Double conversion online

Question 48

What is defined as the force of electricity moving through a circuit?

Options:

A.

Volt

B.

Amp

C.

Ohm

D.

Frequency

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Total 325 questions