CPE CPE Energy Management & Efficiency 1 — Questions and Answers
Question 1: Which metric is used to measure the efficiency of a boiler system?
- Combustion efficiency (Correct answer)
- Power factor
- Thermal resistance
- Load factor
Correct answer: Combustion efficiency
Combustion efficiency measures how effectively a boiler converts fuel energy into heat by analyzing flue gas composition.
Question 2: What is the primary purpose of a variable frequency drive (VFD) in an HVAC system?
- Reduce motor speed to match load demand and save energy (Correct answer)
- Increase voltage to the motor
- Monitor refrigerant pressure
- Control thermostat setpoints
Correct answer: Reduce motor speed to match load demand and save energy
VFDs reduce motor speed proportionally to load demand, cutting energy consumption significantly since power varies with the cube of speed.
Question 3: An ISO 50001 energy management system certification is best described as:
- A framework for continually improving energy performance and reducing consumption (Correct answer)
- A one-time audit of electrical equipment
- A safety standard for high-voltage systems
- A product certification for energy-efficient motors
Correct answer: A framework for continually improving energy performance and reducing consumption
ISO 50001 provides organizations with a systematic framework for managing energy use and continuously improving energy performance.
Question 4: What does the term 'demand charge' refer to on a commercial electricity bill?
- A fee based on the peak power draw during a billing period (Correct answer)
- The total kilowatt-hours consumed per month
- A surcharge for using renewable energy
- A penalty for low power factor
Correct answer: A fee based on the peak power draw during a billing period
Demand charges are fees based on the highest power demand (kW) recorded during any interval in the billing period, incentivizing load leveling.
Question 5: Which type of lighting upgrade typically provides the greatest energy savings in an industrial facility?
- Replacing HID fixtures with LED fixtures (Correct answer)
- Switching from incandescent to CFL bulbs
- Adding occupancy sensors only
- Painting walls a lighter color
Correct answer: Replacing HID fixtures with LED fixtures
Replacing high-intensity discharge (HID) lamps with LEDs can reduce lighting energy consumption by 40–70% while improving light quality.
Question 6: In steam system energy management, what is 'flash steam'?
- Low-pressure steam generated when high-pressure condensate is released to a lower pressure (Correct answer)
- Steam produced by rapid combustion
- Superheated steam escaping a safety valve
- Steam injected to purge a boiler
Correct answer: Low-pressure steam generated when high-pressure condensate is released to a lower pressure
Flash steam forms when high-temperature condensate at high pressure is discharged to a lower pressure, with a portion of the liquid instantly vaporizing.
CPE CPE Energy Management & Efficiency 1
Which metric is used to measure the efficiency of a boiler system?