Data Center University Associate Certification (DU0-001) Practice Test

Questions # 81:

What defines a sub-panel?

Options:

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

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

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

Questions # 82:

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

Options:

The presence of a raised floor

Number of air changes per hour

The rated capacity of the UPS system

The number of double insulated windows

Proximity of the data center to other buildings

Questions # 83:

What is a disadvantage of air cooled self-contained systems?

Options:

Higher capital costs for smaller installations

Requires refrigerant piping to be installed in the field

Often requires installation of duct work or dropped ceiling

Introduces an additional source of liquid to the data center

Questions # 84:

A power line conditioner can compensate for which two events?

Options:

DC offset

Interruptions

Current increases

Voltage fluctuations

Questions # 85:

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

Options:

It prevents hot exhaust air from leaving the cold aisle.

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

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

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

Questions # 86:

What is the unit of measurement of the electrical resistance of a circuit?

Options:

Volt

Amp

Ohm

Frequency

Questions # 87:

Click the Exhibit button.

Question # 87

Which type of power problem is illustrated in the exhibit?

Options:

Harmonics

Overvoltage

Overcurrent

Frequency variation

Questions # 88:

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

Options:

Predictable cooling

Ease of deployment

No raised floor required

Reduced sensible heat ratio

Increased mixing of air streams

Questions # 89:

Which standard was written for the protection of computer or data processing equipment?

Options:

NFPA 71

NFPA 72

NFPA 74

NFPA 75

Questions # 90:

Which two statements are true of fiber cabling versus copper? (Choose two.)

Options:

Fiber cable provides faster connection speeds.

Fiber cable is not prone to electrical interference.

Fiber cable is generally less expensive for shorter distances.

Fiber cables are thicker than copper cables, but they weigh less.

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