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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

Question 1

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 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.

Question 3

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 4

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

Question 5

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 6

The highest density per rack heat loads should be cooled with which cooling architecture?

Options:

A.

Row

B.

Rack

C.

Room

D.

Building

Question 7

Which statement describes the capability of a data cable installation?

Options:

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.

Question 8

Regarding power cabling, what is the minimum number of wires in a factory configured power whip?

Options:

A.

2 wires -- one hot and one ground

B.

5 wires -- two hot, two neutral, and one ground

C.

3 wires -- one hot, one neutral, and one ground

D.

4 wires -- two hot, one neutral, and one ground

Question 9

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 10

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 11

A planning challenge for data center managers is to find an NCPI solution that allows incremental purchases of necessary resources on short time frames.

Which type of NCPI management is concerned with this challenge?

Options:

A.

Change management

B.

Incident management

C.

Capacity management

D.

Availability management

Question 12

When developing a management strategy, how long do organizations typically focus on fully implementing each management process before moving on to the next?

Options:

A.

One to three months

B.

Three to six months

C.

Six to nine months

D.

Nine to twelve months

Question 13

What are two primary challenges for optimizing lifecycle costs with regard to rack systems? (Choose two.)

Options:

A.

Structural integrity

B.

Non-standardized racks

C.

Slow speed of deployment

D.

Floor space requirements

Question 14

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 15

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 16

Which three fuels are used to power a generator? (Choose three.)

Options:

A.

Glycol

B.

Diesel

C.

Gasoline

D.

Methanol

E.

Natural gas

Question 17

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

Options:

A.

Underfloor cabling

B.

Proper cable management

C.

Split rear doors to allow for easier access

D.

Unique enclosures to meet specific equipment needs

Question 18

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

Question 19

What is an advantage of ceiling mount systems?

Options:

A.

They plug into wall outlets

B.

They provide the highest capacity units

C.

They rapidly redeploy to a different location

D.

They do not take away from IT equipment space

Question 20

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.

Question 21

Click the Exhibit button.

Question # 21

This picture illustrates which type of cooling architecture?

Options:

A.

Hybrid

B.

Row

C.

Rack

D.

Room

Question 22

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

Options:

A.

Delivery cost

B.

Installation cost

C.

Inventory and storage cost

D.

Patch cable maintenance cost

Question 23

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 24

Which two types of cables would you expect to see used in a network backbone?(Choose two.)

Options:

A.

Power cables

B.

Fiber optic cables

C.

Category 5/5e/6a cables

D.

Audio / video cables

Question 25

Which method of heat transfer occurs when stepping barefoot onto hot pavement?

Options:

A.

Radiation

B.

Convection

C.

Conduction

D.

Evaporation

Question 26

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 27

What are two advantages of the line interactive UPS? (Choose two.)

Options:

A.

High reliability

B.

High efficiency

C.

High frequency control

D.

Optimized for 10 kW and above

Question 28

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

Options:

A.

Each cooling unit works to cool the load through a raised floor plenum.

B.

Each cooling unit is ceiling mounted and targets cool air to the cold aisles.

C.

Each cooling unit works directly to cool the heat load of a specific equipment rack.

D.

Each cooling unit is placed along the data center wall and cools the general air space.

Question 29

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 30

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

Question 31

What is the primary difference between double conversion and delta conversion UPS systems?

Options:

A.

Double conversion UPSs require a 1.3X generator oversizing. Delta conversion UPSs require a 3X generator oversizing.

B.

Double conversion UPSs are practical in size ranges from 0 - 20 kW. Delta conversion UPSs are practical in size ranges of 20 kW to 1 MW.

C.

In a double conversion UPS, 100% of the power is converted from AC to DC and then again from DC to AC. In a delta conversion UPS, only the difference between input and output power is converted.

D.

In a double conversion UPS, the transformer has a special ferro-resonant capability, which provides limited voltage regulation and output waveform shaping. In a delta conversion UPS, a standard transformer is used.

Question 32

The rear of an IT equipment rack is fitted with a fan-assist device that is connected to a drop ceiling plenum, which is in turn connected to the perimeter CRAC unit.

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

Options:

A.

Flooded supply

B.

Fully ducted return

C.

Locally ducted return

D.

Locally ducted supply

Question 33

Click the Exhibit button.

Question # 33

This picture illustrates which type of cooling architecture?

Options:

A.

Hybrid

B.

Row-oriented

C.

Rack-oriented

D.

Room-oriented

Question 34

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 35

What is an advantage of air cooled split systems?

Options:

A.

Lower capital costs for smaller installations

B.

Refrigerant piping must be installed in the field

C.

Reduction in maintenance complexity and cost

D.

Introduces an additional source of liquid to the data center

Question 36

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

Question 37

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 38

What is the primary purpose of data center physical security?

Options:

A.

To monitor activities of data center employees

B.

To set up proper firewalls and avoid hacking of computers

C.

To keep unauthorized people out of places they do not belong

D.

To research the background of individuals who visit the data center

Question 39

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

Options:

A.

Blackout

B.

Brownout

C.

Power drought

D.

Power suppression

Question 40

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 41

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

Options:

A.

Ground loop

B.

Branch circuit

C.

Metered outlet strip

D.

Power distribution unit (PDU)

E.

Valve regulated lead acid (VRLA) battery

Question 42

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.

Question 43

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.

Question 44

Which standard ensures physical compatibility between racks, enclosures, and rack mounted equipment?

Options:

A.

RoHS

B.

EIA-310

C.

NFPA 70

D.

ASTM A653

Question 45

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 46

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 47

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.

Question 48

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

Page: 1 / 33
Total 325 questions