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26. Which statement correctly defines direct current (DC)?
A. Only high voltage is used.
B. Electricity flows in one direction only.
C. The circuit does not have multiple paths.
D. The circuit is directly attached to the power source.
Answer: B
27. What is the purpose of grounding?
A. To protect against electric shock
B. To step down 208 V power to 120 V power
C. To maintain the voltage during neutral wire bonding
D. To provide a path for the Ground Fault Interrupt (GFI) circuit
Answer: A
28. What is a difference between Single-phase and three-phase power?
A. Single-phase power is flat but three-phase power is sinusoidal.
B. Single-phase power is dependent on power factor but three-phase power is not.
C. Single-phase power is limited to approximately 120 kW but three-phase power is unlimited.
D. Single-phase power is more costly for the power company to distribute than three-phase power.
Answer: D
29. What does GFCI mean?
A. Ground Fault Circuit Interrupter
B. General Facilities Cooling Index
C. Gaussian Filter Charge Indicator
D. Grounded Flaw Circuitry Installed
Answer: A
30. What are three power distribution components found in data centers? (Choose three.)
A. Ground loop
B. Branch circuit
C. Metered outlet strip
D. Power distribution unit (PDU)
E. Valve regulated lead acid (VRLA) battery
Answer: BCD
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