What is the advantage of a three-phase power source versus a single-phase power source?
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.
Which statement defines "service entrance"?
A. The switchgear delivering AC power to a UPS
B. The secondary side of a transformer at 208 V or 230 V
C. The point at which power is distributed from a panel board to a receptacle or local power distribution within an IT enclosure
D. The point where the responsibility of the electrical power infrastructure shifts from the utility company to the owner or tenants of the building
How many amps is a NEMA 5-30R receptacle rated to support?
A. 5 amps
B. 15 amps
C. 20 amps
D. 30 amps
Which three key components make up a three-phase stationary power distribution unit? (Choose three.)
A. Rectifier
B. Panel board
C. Input transformer
D. Rack mount bracket
E. Input circuit breaker
What are two common UPS topologies? (Choose two.)
A. Standby
B. Delta interactive
C. Standard interactive
D. Double conversion on-line
Which statement describes a three-phase power source?
A. Two voltage sine wave references consisting of two "hot" wires and a ground
B. One voltage sine wave reference consisting of a "hot" wire, a neutral wire, and a ground
C. Three voltage sine wave references consisting of one "hot" wire, one neutral wire, and a ground
D. Three voltage sine wave references consisting of three "hot" wires and accompanying neutral and a ground
Which are three examples of "what you know" access control? (Choose three.)
A. Password
B. Coded lock
C. Iris detection sensor
D. Speaking into a voice recognition sensor E. Use of keyboard commands to log in to a computer system
Which two would be used for biometric access control? (Choose two.)
A. Voice
B. Fingerprint
C. Smart cards
D. Personal identification number
What is the primary difference between double conversion and delta conversion UPS systems?
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.
What are two key characteristics of a UPS? (Choose two.)
A. It tests voltages on IT equipment.
B. It safeguards data in the event of a power loss.
C. It measures energy consumption of IT equipment.
D. It transfers IT equipment from utility to battery power.
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