Certified Energy Auditor Lighting and Electrical Systems Questions and Answers

Question 1

An energy auditor is evaluating four different LED lamp options for a retrofit project. Which of the following lamps is the most energy-efficacious?

Accepted Answer

Lamp D: 800 lumens, 5 watts

Answer

Lamp A: 1600 lumens, 15 watts

Answer

Lamp B: 1200 lumens, 10 watts

Answer

Lamp C: 2000 lumens, 20 watts

Question 2

During a facility audit, the utility bills for a manufacturing plant show a consistent power factor penalty charge each month. The plant's load consists primarily of large induction motors. Which of the following is the most direct and cost-effective solution to mitigate these penalty charges?

Accepted Answer

Installing appropriately sized capacitor banks

Answer

Replacing all motors with premium efficiency models

Answer

Upgrading the facility's main transformer

Answer

Increasing the operating voltage of the facility

Question 3

An energy auditor is assessing an open-plan office with large perimeter windows that provide significant natural light throughout the day. To maximize energy savings, which lighting control strategy would be most effective for the rows of luminaires closest to the windows?

Accepted Answer

Daylight harvesting with continuous dimming

Answer

Time-of-day scheduling

Answer

Ultrasonic occupancy sensors

Answer

Manual wall-box dimmers for each zone

Question 4

Which of the following is the primary source of harmonic currents in a modern commercial office building's electrical system?

Accepted Answer

Non-linear loads like computer power supplies and electronic ballasts

Answer

Incandescent lighting

Answer

Synchronous motors for large fans

Answer

Step-down distribution transformers

Question 5

An energy auditor is analyzing the performance of a large distribution transformer. Which type of transformer loss remains relatively constant regardless of the load level, as long as the transformer is energized?

Accepted Answer

No-load (core) losses

Answer

Load (copper) losses

Answer

Stray losses

Answer

Resistive (I²R) losses

Question 6

When conducting a lighting audit, an auditor uses a light meter to take readings on desktops and work surfaces throughout a space. What quantity is the auditor measuring, and what are its common units?

Accepted Answer

Illuminance, measured in Foot-candles or Lux

Answer

Luminous Flux, measured in Lumens

Answer

Luminous Efficacy, measured in Lumens per Watt

Answer

Color Rendering Index (CRI), measured on a scale of 0-100