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Question 1. Which of the following generation methods converts kinetic energy of moving water into electricity? A) Photovoltaic solar panels B) Wind turbines C) Hydro turbines D) Geothermal heat pumps Answer: C Explanation: Hydro turbines use the kinetic energy of flowing water to spin a generator and produce electricity. Question 2. In a centralized generation system, electricity is typically transmitted over long distances before distribution. What is the primary advantage of this arrangement? A) Reduced transmission losses due to lower voltage B) Higher reliability of local generation sources C) Ability to use larger, more efficient generating units D) Elimination of the need for distribution transformers Answer: C Explanation: Centralized generation allows the use of large, high‑efficiency plants that benefit from economies of scale, even though power must travel farther. Question 3. Which component of a natural gas pipeline system is primarily responsible for maintaining pressure and flow to downstream customers? A) Compressor station B) Regulator valve C) Metering station D) Storage cavern
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Answer: A Explanation: Compressor stations boost gas pressure to overcome friction losses and keep gas moving through the pipeline network. Question 4. A utility bill shows a “fuel adjustment clause.” What does this charge typically reflect? A) Seasonal variations in electricity demand B) Changes in the cost of the utility’s fuel supply C) Penalties for low power factor D) Fixed administrative fees Answer: B Explanation: Fuel adjustment clauses pass through fluctuations in the utility’s fuel costs (e.g., natural gas, coal) to the customer. Question 5. Which unit best describes the rate at which energy is used? A) kilowatt‑hour (kWh) B) British thermal unit (BTU) C) kilowatt (kW) D) Joule (J) Answer: C Explanation: Power (kW) is the rate of energy consumption; energy is measured in kWh, BTU, or Joules. Question 6. A building’s electric bill includes a demand charge based on the highest 15 ‑minute interval of demand each month. Which of the following strategies directly reduces this charge? A) Installing low‑flow fixtures
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Question 9. An energy audit Level II typically includes which of the following deliverables? A) Walk‑through inspection only B) Detailed engineering analysis and economic evaluation of measures C) Full building simulation model D) Only a high‑level energy use summary Answer: B Explanation: Level II (energy audit) provides detailed data collection, analysis, and a list of recommended measures with cost estimates. Question 10. The Facility Load Factor is calculated by dividing the average load by the peak load. A higher load factor indicates: A) Greater variability in demand B) More efficient utilization of installed capacity C) Higher demand charges D) Increased need for backup generators Answer: B Explanation: A higher load factor means the facility operates closer to its peak capacity consistently, indicating better utilization. Question 11. Which instrument is most appropriate for measuring the surface temperature of a hot water pipe without direct contact? A) Clamp‑on ammeter B) Thermocouple probe C) Infrared thermal camera D) Anemometer
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Answer: C Explanation: An infrared thermal camera captures surface temperature from a distance, ideal for non‑contact measurements. Question 12. In a three‑phase Y‑connected system, the line voltage is ___ the phase voltage. A) Equal to B) √2 times C) √3 times D) Half of Answer: C Explanation: For a Y‑connected system, line voltage = √ 3 × phase voltage. Question 13. Which type of transformer loss is primarily caused by the resistance of the windings? A) Core (iron) loss B) Hysteresis loss C) Copper loss D) Stray loss Answer: C Explanation: Copper loss (I²R) occurs due to the resistance of the transformer windings when current flows. Question 14. A voltage drop of more than 3 % in a distribution feeder is generally considered: A) Acceptable for all loads
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Question 17. Which of the following is a primary benefit of installing a Variable Frequency Drive (VFD) on a centrifugal pump? A) Increases pump head without changing speed B) Allows operation at lower speeds to match demand, reducing energy use C) Eliminates the need for a pump controller D) Improves water quality Answer: B Explanation: VFDs adjust motor speed to match flow demand, significantly lowering pump energy consumption. Question 18. LEDs typically have an efficacy of: A) 10–20 lm/W B) 30–40 lm/W C) 80–120 lm/W D) 150–200 lm/W Answer: C Explanation: Modern LED lamps achieve 80–120 lumens per watt, far surpassing incandescent and fluorescent sources. Question 19. The Coefficient of Utilization (CU) in lighting design is used to: A) Determine lamp life expectancy B) Relate the luminous flux reaching the work plane to the total lamp output C) Calculate the power factor of lighting circuits D) Measure the color rendering index (CRI) Answer: B
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Explanation: CU is the ratio of useful light on the work plane to the total light emitted by the fixtures. Question 20. Which lighting control strategy can reduce energy use by dimming lights in response to available daylight? A) Occupancy sensor only B) Time‑schedule timer C) Daylight harvesting system D) Manual switch operation Answer: C Explanation: Daylight harvesting adjusts electric lighting levels based on measured natural light, saving energy. Question 21. Conduction heat transfer through a wall is best reduced by increasing the wall’s: A) Solar reflectance B) U‑factor C) R‑value D) Air permeability Answer: C Explanation: Higher R‑value indicates greater thermal resistance, thus lowering conductive heat loss. Question 22. Which building envelope component typically has the highest U‑factor (i.e., lowest resistance) in a typical office building? A) Double‑glazed window B) Exterior insulated wall
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A) Proportional B) Integral C) Derivative D) Feed‑forward Answer: B Explanation: The integral component accumulates error over time, driving the steady‑state error toward zero. Question 26. The Coefficient of Performance (COP) for a heat pump is defined as: A) Heating output ÷ Electrical input B) Cooling output ÷ Electrical input C) Total energy consumption ÷ Delivered heat D) Ratio of refrigerant mass flow to compressor speed Answer: A Explanation: COP = heating (or cooling) energy delivered divided by the electrical energy consumed by the heat pump. Question 27. Which of the following HVAC components directly recovers heat from exhaust air to pre‑condition incoming outdoor air? A) Chiller B) Cooling tower C) Energy recovery ventilator (ERV) D) Variable air volume (VAV) box Answer: C Explanation: An ERV transfers heat (and moisture) from exhaust to incoming air, improving overall system efficiency.
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Question 28. In testing and balancing (TAB) of an HVAC system, the primary goal is to: A) Reduce refrigerant charge B) Ensure each terminal unit receives its design airflow C) Increase thermostat setpoints D) Replace all filters with higher MERV ratings Answer: B Explanation: TAB verifies that airflow rates at diffusers and registers match design specifications for optimal performance. Question 29. Which maintenance practice most directly reduces compressed‑air system energy consumption? A) Lubricating motor bearings weekly B) Replacing all pneumatic tools with electric ones C) Fixing leaks larger than 0.1 scfm D) Painting air lines to prevent corrosion Answer: C Explanation: Leaks cause the compressor to run longer, wasting energy; fixing them yields immediate savings. Question 30. Boiler fouling primarily reduces efficiency by: A) Increasing steam pressure B) Raising the combustion temperature C) Adding thermal resistance to heat transfer surfaces D) Enhancing fuel atomization Answer: C
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D) Annual fuel cost divided by number of occupants Answer: A Explanation: Energy intensity (often expressed as kWh/ft²‑yr) normalizes total energy use to the building’s size. Question 34. A utility’s Time‑of‑Use (TOU) rate structure charges higher rates during: A) Nighttime hours only B) Weekends only C) Periods of peak system demand D) All hours equally Answer: C Explanation: TOU rates are higher during peak demand periods to encourage load shifting. Question 35. Which of the following statements best describes a “decentralized” generation system? A) Electricity is produced at a large, remote power plant and transmitted over long distances. B) Generation occurs close to the point of use, often on the same site as the load. C) Generation is limited to hydroelectric facilities only. D) Power is only generated during off‑peak hours. Answer: B Explanation: Decentralized generation (e.g., rooftop PV, small cogeneration) produces electricity near the consuming load. Question 36. The term “thermal mass” in a building envelope refers to: A) The amount of insulation installed in walls B) The ability of a material to store and release heat
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C) The total heating load of the building D) The R‑value of the roof assembly Answer: B Explanation: Thermal mass (e.g., concrete, brick) absorbs heat during the day and releases it when temperatures drop, moderating indoor temperature swings. Question 37. Which of the following lighting technologies typically has the longest rated lamp life? A) Incandescent B) Fluorescent compact (CFL) C) High‑Intensity Discharge (HID) D) Light‑Emitting Diode (LED) Answer: D Explanation: LEDs commonly have rated lifespans of 30,000–50,000 hours, far exceeding other technologies. Question 38. In a three‑phase, four‑wire wye system supplying both line‑to‑line and line‑to‑neutral loads, the neutral conductor carries: A) The sum of all phase currents B) Zero current at all times C) The vector sum of the three phase currents, which is often close to zero in balanced conditions D) Only the unbalanced current component Answer: C Explanation: In a balanced wye system, the neutral current is the vector sum of the three phase currents and is ideally zero; any imbalance appears as neutral current.
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Explanation: Cooling capacity = COP × electrical input = 5.5 × 200 kW = 1,100 kW. (Correction: Actually 5.5 × 200 kW = 1,100 kW, so answer should be C. However the options list 1,100 kW as C. Therefore correct answer is C.) Answer: C Explanation: Multiply the chiller’s COP (5.5) by its electrical consumption (200 kW) to obtain the cooling output: 5.5 × 200 = 1,100 kW. Question 42. In an HVAC system, “sensible heat ratio” (SHR) is defined as: A) The proportion of total heating capacity that is latent B) The ratio of sensible cooling load to total cooling load C) The efficiency of a heat pump in heating mode D) The pressure drop across a coil Answer: B Explanation: SHR = sensible cooling load ÷ total cooling load; it indicates the fraction of cooling that removes dry‑bulb temperature without dehumidification. Question 43. Which of the following is a common method to reduce fan energy consumption in a variable air volume (VAV) system? A) Installing larger ductwork B) Using constant‑speed fans only C) Adding static pressure sensors and VFDs to modulate fan speed D) Raising the supply air temperature setpoint above 85 °F Answer: C Explanation: Static pressure sensors paired with VFDs allow the fan to operate at the minimum speed needed to meet demand, reducing energy use.
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Question 44. A building’s electricity bill shows a “power factor penalty” of $150. This penalty is most likely incurred because: A) The building’s average demand exceeds the contracted demand. B) The building’s power factor is below the utility’s minimum requirement (e.g., 0.95). C) The building operates during peak demand periods. D) The building uses more than 10 kW of demand charges. Answer: B Explanation: Utilities charge penalties when a customer's power factor falls below a specified threshold, as it increases system losses. Question 45. Which of the following HVAC control strategies can most effectively reduce energy use in a building with variable occupancy? A) Fixed schedule operation B) Constant‑temperature setpoint regardless of occupancy C) Occupancy‑based setback with demand‑controlled ventilation D) Manual thermostat adjustments by occupants Answer: C Explanation: Occupancy sensors trigger temperature setbacks and adjust ventilation rates, aligning system operation with actual space use. Question 46. In a pneumatic system, the term “leakage” is typically expressed in: A) Cubic feet per minute (CFM) at standard conditions (scfm) B) Kilowatts (kW) of power loss C) Gallons per minute (GPM) of compressed air D) Pounds per square inch (psi) of pressure drop
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B) It recovers waste heat from the cooling process to provide heating, improving overall system COP. C) It operates without any refrigerant. D) It reduces the need for any chilled water pumps. Answer: B Explanation: HRChs capture waste heat from the condenser and reuse it for heating, raising overall plant efficiency. Question 50. In a building’s gas bill, the “therm” is a unit of measurement equivalent to: A) 1,000 BTU B) 100 cubic feet of natural gas at standard conditions C) 1 kWh of electricity D) 10 m³ of propane Answer: B Explanation: One therm equals 100 cubic feet of natural gas at standard temperature and pressure, roughly 1 × 10⁵ BTU. Question 51. Which of the following best explains why a building with a high “daylight factor” may still need artificial lighting? A) Daylight factor only measures interior illumination at a single point and does not account for shading, orientation, or occupant needs. B) Daylight factor is a measure of solar heat gain, not visible light. C) High daylight factor automatically disables occupancy sensors. D) Daylight factor is only applicable to exterior lighting design. Answer: A Explanation: Daylight factor is the ratio of interior to exterior illuminance at a reference point; it does not guarantee adequate lighting throughout the space.
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Question 52. Which of the following statements about “heat pump water heaters” (HPWH) is correct? A) They have a COP of less than 1 because they generate heat. B) They extract heat from ambient air and deliver it to water, achieving COPs of 2–3. C) They require a combustion furnace to operate. D) They are only suitable for industrial processes. Answer: B Explanation: HPWHs move heat from surrounding air into water, typically achieving a coefficient of performance (COP) between 2 and 3. Question 53. A building’s electric demand charge is based on the highest 30‑minute demand each month. Which strategy would most effectively lower this demand? A) Installing high‑efficiency lighting B) Adding insulation to exterior walls C) Implementing staggered start times for large equipment D) Replacing old boilers with condensing models Answer: C Explanation: Staggering equipment start times spreads the load, reducing peak demand measured over a short interval. Question 54. Which of the following is a typical symptom of a fouled boiler heat transfer surface? A) Increased flue gas temperature B) Decreased water temperature in the supply loop C) Higher combustion efficiency
