UMC Utility Operations & Infrastructure 3 ā Questions and Answers
Question 1: What is the function of a load balancer in an electric distribution network?
- To increase voltage at the substation
- To redistribute load among feeders to prevent overloading any single circuit (Correct answer)
- To measure customer energy consumption
- To ground lightning strikes safely
Correct answer: To redistribute load among feeders to prevent overloading any single circuit
Load balancing redistributes electrical load across multiple feeders or phases to prevent thermal overloads, reduce losses, and improve reliability.
Question 2: Which wastewater treatment level specifically targets nutrients such as nitrogen and phosphorus?
- Primary treatment
- Secondary treatment
- Tertiary (advanced) treatment (Correct answer)
- Preliminary screening
Correct answer: Tertiary (advanced) treatment
Tertiary or advanced treatment processesāincluding biological nutrient removal and chemical precipitationāare required to remove nutrients that cause eutrophication.
Question 3: A utility notices its system average interruption duration index (SAIDI) has increased year over year. This indicates:
- More customers are being served
- Customers are experiencing longer total outage durations on average (Correct answer)
- Fewer outages are occurring
- Reliability has improved
Correct answer: Customers are experiencing longer total outage durations on average
SAIDI measures the average total duration of interruptions per customer per year; an increase means customers are spending more cumulative time without power.
Question 4: In a natural gas distribution system, what is the purpose of a pressure regulating station (PRS)?
- To add odorant to the gas stream
- To reduce high transmission pressure to safe distribution pressure levels (Correct answer)
- To remove moisture from the gas
- To measure gas quality and heating value
Correct answer: To reduce high transmission pressure to safe distribution pressure levels
A pressure regulating station uses regulator valves to step down high-pressure transmission gas to lower distribution pressures suitable for customer delivery.
Question 5: Which method is commonly used by electric utilities to defer costly infrastructure upgrades through targeted customer demand reduction in specific areas?
- Time-of-use pricing only
- Non-wire alternatives (NWAs) using demand response and distributed resources (Correct answer)
- Building additional generating capacity
- Increasing transmission voltage
Correct answer: Non-wire alternatives (NWAs) using demand response and distributed resources
Non-wire alternatives deploy demand response, energy efficiency, and distributed energy resources at targeted locations to reduce peak load and defer traditional infrastructure investments.
Question 6: What is the primary risk addressed by cathodic protection on underground metallic pipelines?
- Internal scaling from hard water
- Electrochemical corrosion of the pipe wall (Correct answer)
- Gas odor loss over time
- Pressure fluctuations during peak demand
Correct answer: Electrochemical corrosion of the pipe wall
Cathodic protection applies an electrical current to counteract the electrochemical reactions that cause corrosion on buried metal pipe surfaces.
Question 7: Which of the following best describes 'demand response' as used in electric utility management?
- The utility's plan for emergency generator dispatch
- Voluntary or incentivized reduction of customer electricity use during peak periods (Correct answer)
- Automatic voltage regulation at substations
- Rate design for large commercial accounts
Correct answer: Voluntary or incentivized reduction of customer electricity use during peak periods
Demand response programs compensate customers for reducing or shifting electricity consumption during high-demand periods, helping utilities manage peak load without additional generation.
UMC Utility Operations & Infrastructure 3
What is the function of a load balancer in an electric distribution network?