DU0-001 questions and answers

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

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

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

They enclose the top and bottom of racks to balance hot and cold air.

They enclose the rear of racks to ensure mixing of hot and cold air.

They enclose the front of racks to ensure reliable supply air delivery.

Delayed input transformer

Limited induction transformer

Seismic enclosure

Enclosure with perforated doors

Enclosure with rack-mounted fans

Class B

Class C

Class D

Row

Rack

Ceiling

Plugs into wall outlets

Rapid redeployment to a different location

Does not take away from IT equipment space

They convert Internet protocols (IP).

They convert copper signals into fiber optic light signals.

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

Availability of safety resources

Safety of the people in the building

Comfort of the people in the building

RoHS

NFPA 70

ASTM A653

Radiation

Conduction

Evaporation

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

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

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

Volt

Ohm

Frequency

Changes the tone of the alarm depending on the heat intensity of a fire

Regulates the amount of air entering the sensor chamber to minimize false alarms

Uses wireless technology similar to RFID which requires fewer detectors per unit area

It has a low pressure delivery system.

It requires less storage tanks than Halon.

3 UPSs paralleled; each UPS capable of 150 kW

5 UPSs paralleled; each UPS capable of 100 kW

34 - 38 F (1 - 3 C)

56 - 60 F (13 - 16 C)

70 - 74 F (21 - 23 C)

Higher capital costs for smaller installations

Requires refrigerant piping to be installed in the field

Introduces an additional source of liquid to the data center

10%

66%

75%

Cost of downtime per hour increases with time.

Cost of downtime per hour decreases with time.

Cost of downtime per hour is exponential with time.

Harmonics

Overcurrent

Frequency variation

Change management

Capacity management

Availability management

FE-130

Halon 1211

UPS control panel

Pneumatic door opener

Fire suppression de-activation (FSD) button

Volt

Amp

Frequency

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

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

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

Generator switch-over

Air conditioner starting up

Single-phase power is flat but three-phase power is sinusoidal.

Single-phase power is dependent on power factor but three-phase power is not.

Single-phase power is limited to approximately 120 kW but three-phase power is unlimited.

It makes the password database an easier target for hackers

It makes it harder for legitimate users to access their own data

It burdens the IT help desk with requests for forgotten or expired passwords

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

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

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

Perform a diagnostic on the rectifier.

Perform an inverter voltage regulation check.

Fuel quality

Prime mover cooling techniques

Glycol

Methanol

To remove transients from the power path

To detect and report power factor problems

To convert from three-phase power to Single-phase power

Inexpensive to deploy

Always correctly identifies the user

Ability to virtualize

Ability to oversize

Interruptions

Current increases

Chilled water system

Water cooled system

Air cooled split system

National Fire Prevention Agency

National Flammable Protection Act

National Firefighter & Paramedic Alliance

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

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

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

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

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.

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.

Underfloor cabling

Unique enclosures to meet specific equipment needs

Downtime caused by high speed storage.

Downtime caused by poorly trained computer operators.

Downtime caused by improper operational process documentation.

It pulls air from the sides of the enclosure and directs it through the top.

It pulls air from the sides of the enclosure and directs it to the hot aisles.

It pulls air from the raised floor and directs it through the sides of the enclosure.

Using an FM-200 clean agent

Using trash receptacles without covers

Cable capacity

Cooling requirements

Enclosure door clearance

Power line conditioner

Power factor corrected power supply

Transient voltage surge suppressor (TVSS)

Who you are

Where you are

What you have

Rectifier

Rack mount bracket