141 S19

A UPS is typically used to protect hardware such as:

• Computers
• Data centers (an example shown below)
• Telecommunication equipment
• All the choices

A UPS differs from an auxiliary or emergency power system or standby generator as it provides near-instantaneous protection from input power interruptions. It does this by supplying energy stored in_____________, super capacitors, or flywheels.

• Batteries
• Transformer
• Motors
• All of the choices

What else do most UPS do in addition to providing protection from loss of power supply?

• More voltage
• Surge protection
• Variable voltage
• High voltage

_______________ the load is powered directly by the input power and the backup power circuitry is only used when the supply power fails. Most UPS below 1 kVA are of the line-interactive or standby type and are usually less expensive.

• Standby (off-line) UPS system
• Line-interactive UPS
• On-line UPS
• Dynamic uninterruptible power supplies (DUPS)

________________maintains the inverter in line and redirects the battery’s DC current path from the normal charging mode to supplying current when power is lost.

• Standby (off-line) UPS system
• Line-interactive UPS
• On-line UPS
• Dynamic uninterruptible power supplies (DUPS)

_______________- takes AC input, rectifying to DC for passing through the rechargeable battery, then inverting back to 120V/240V AC for powering the protected equipment.

• Standby (off-line) UPS system
• Line-interactive UPS
• On-line UPS
• Dynamic uninterruptible power supplies (DUPS)

For large power units, ________________________are often used.

• Standby (off-line) UPS system
• Line-interactive UPS
• On-line UPS
• Dynamic uninterruptible power supplies (DUPS)

There are primarily __________kinds of batteries used in UPSs.

• five
• three
• four
• two

________________________, also known as sealed or maintenance-free.

• Valve-regulated lead-acid (VRLA)
• Wet-cell
• Flooded-cell
• Dry-cell

______________ (also called flooded-cell).

• Valve-regulated lead-acid (VRLA)
• Wet-cell
• Flooded-cell
• Dry-cell