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

Demo: 48 questions
Total 325 questions

Data Center University Associate Certification Questions and Answers

Question 1

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

Options:

A.

Inverter

B.

Rectifier

C.

Governor

D.

Alternator

E.

Prime mover

Question 2

What are three data center attributes that impact the selection of a fire protection system? (Choose three.)

Options:

A.

The presence of a raised floor

B.

Number of air changes per hour

C.

The rated capacity of the UPS system

D.

The number of double insulated windows

E.

Proximity of the data center to other buildings

Question 3

A data center manager wants to purchase a reliable UPS and specifies an MTBF of one million hours.

What are two reasons this specification is flawed? (Choose two.)

Options:

A.

Assumptions are not stated.

B.

No definition of failure is provided.

C.

Manufacturers do not provide MTBF.

D.

MTBF is not a measure of reliability.

Question 4

Click the Exhibit button.

What type of power problem does the exhibit illustrate?

Options:

A.

Harmonics

B.

Overvoltage

C.

Overcurrent

D.

Impulsive transient

Question 5

What are the four operating modes of CRAC units?

Options:

A.

Cooling, heating, saturation, humidification

B.

Cooling, heating, dehumidification, saturation

C.

Cooling, heating, humidification, dehumidification

D.

Cooling, humidification, dehumidification, saturation

Question 6

What is the correct order of the refrigeration cycle datacenter precision cooling?

Options:

A.

Condensation > evaporation > expansion > compression

B.

Compression > condensation > evaporation > expansion

C.

Evaporation > expansion > condensation > compression

D.

Evaporation > compression > condensation > expansion

Question 7

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

Question 8

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

Question 9

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

Question 10

How is the problem of Electro-Static Discharge(ESD) in the data center solved?

Options:

A.

By installing TVSS devices

B.

By installing RCD breakers in the PDU

C.

By connecting bimetallic strips to all racks

D.

By insulating IT equipment with rubber bushings

Question 11

What is the primary security disadvantage of a bar code card?

Options:

A.

High cost

B.

Easily damaged

C.

Easy to counterfeit

D.

Does not have a picture

Question 12

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

Question 13

Which two UPS topologies are used for UPS systems that supply at least 50 kW? (Choose two.)

Options:

A.

Standby

B.

Standby - ferro

C.

Delta conversion online

D.

Double conversion online

Question 14

What are three characteristics that a data center manager should look for when selecting a clean agent suppression system? (Choose three.)

Options:

A.

Pre-action valve

B.

Non-conductive agent

C.

Minimal storage footprint

D.

Zero ozone depletion potential

E.

Manual operation requirement

Question 15

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.

Question 16

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 17

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 18

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

Options:

A.

Predictable cooling

B.

Ease of deployment

C.

No raised floor required

D.

Reduced sensible heat ratio

E.

Increased mixing of air streams

Question 19

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 20

Which three situations can physical security systems help prevent? (Choose three.)

Options:

A.

Network viruses

B.

Accidental EPO activation

C.

Theft of generator batteries

D.

Power outages caused by the utility company

E.

Circuit overloads due to unauthorized addition of servers

Question 21

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

Options:

A.

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

B.

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

C.

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

D.

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

Question 22

What are three transformer types? (Choose three.)

Options:

A.

Step-up transformer

B.

Isolation transformer

C.

Step-down transformer

D.

Delayed input transformer

E.

Limited induction transformer

Question 23

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 24

What is the worldwide recognized standard for equipment mounting spacing for 482.6 mm (19 inch) equipment?

Options:

A.

EIA-310

B.

UL 1778

C.

CSA C22.2

D.

NEBS GR-63-CORE

Question 25

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

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 two would cause a swell? (Choose two.)

Options:

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

Question 28

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 29

What is the largest cause of downtime in data centers?

Options:

A.

Sabotage

B.

Human error

C.

Natural disasters

D.

Equipment failure

Question 30

How does poor network cable management within an IT rack lead to IT equipment damage?

Options:

A.

Obstructs airflow

B.

Adds weight to servers

C.

Requires the need for more cabling

D.

Causes cable to exceed bend radius

Question 31

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

Question 32

Which air conditioning system must have a one-to-one relationship between the indoor unit and the outdoor heat exchanger?

Options:

A.

Air cooled systems

B.

Chilled water systems

C.

Water cooled systems

D.

Glycol cooled systems

Question 33

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

Question 34

What is the definition of a cable assembly?

Options:

A.

A set of cables twisted together

B.

A cable with a connector terminated onto both ends

C.

A 3-wire cable that is 12 feet (3.66 meters) in length

D.

A bare cable that is ready to be assembled with its connectors

Question 35

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 36

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

Question 37

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

Question 38

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 39

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

Options:

A.

Adding more IT personnel

B.

Adding live security guards

C.

Changing from smart cards to bar code badges

D.

Adding concentric security zones to increase "depth of security"

E.

Adding password or fingerprint verification at a card-reading checkpoint

Question 40

What is the purpose of the voltage regulator as a component of a standby generator?

Options:

A.

To control voltage produced at the output of the prime mover

B.

To control the voltage produced at the output of the alternator

C.

To control current flow produced at the output of the alternator

D.

To control voltage produced by the starter to start the prime mover

Question 41

Which is an example of a rack-oriented cooling architecture?

Options:

A.

A cooling unit is located in the ceiling plenum to cool the data center racks.

B.

A cooling unit is located within the rack itself to cool the contents of that rack.

C.

A cooling unit utilizes perforated raised floor tiles to deliver cool air to the rack.

D.

A cooling unit is located along the perimeter wall of the data center to cool a specific zone of racks.

Question 42

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

Question 43

Click the Exhibit button.

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

Options:

A.

DC offset

B.

Overvoltage

C.

Undervoltage

D.

Harmonic distortion

Question 44

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

Options:

A.

Incident management

B.

Change management

C.

Capacity management

D.

Availability management

Question 45

Which NCPI change management challenge is faced when optimizing business agility?

Options:

A.

Maximizing the ratio of rack efficiency to cost over runs.

B.

Maximizing the ratio of the UPS to batteries needed for uptime.

C.

Maximizing the ratio of planned to unplanned work in a data center.

D.

Maximizing the ratio of leak detection to computer room air conditioners.

Question 46

Which type of cooling equipment can IT professionals install without requiring assistance from facilities personnel?

Options:

A.

Portable systems

B.

Floor mounted systems

C.

Ceiling mounted systems

D.

Wall mounted split-systems

Question 47

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 48

What does the term "short cycling" mean?

Options:

A.

The fire suppression system clean agents are running low and have not been recycled.

B.

Cool air from the CRAC bypasses the IT equipment and flows directly into the CRAC return air duct.

C.

The raised floor is obstructed with excess cables and cool air is not getting through the vented floor tiles.

D.

The UPS supplies less runtime than anticipated because of overall wear and tear on the internal batteries.

Demo: 48 questions
Total 325 questions