CPE CPE Energy Management & Efficiency

Question 1

Which metric is used to measure the efficiency of a boiler system?

Accepted Answer

Combustion efficiency

Answer

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?

Accepted Answer

Reduce motor speed to match load demand and save energy

Answer

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:

Accepted Answer

A framework for continually improving energy performance and reducing consumption

Answer

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?

Accepted Answer

A fee based on the peak power draw during a billing period

Answer

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?

Accepted Answer

Replacing HID fixtures with LED fixtures

Answer

Replacing high-intensity discharge (HID) lamps with LEDs can reduce lighting energy consumption by 40–70% while improving light quality.

(CPE) Certified Plant Engineer Practice Test