Certified Energy Auditor Certification Certified Energy Auditor Lighting and Electrical Systems Questions and Answers 3

Question 1

An energy auditor is evaluating daylighting controls in a perimeter office zone. What is the recommended setpoint strategy for continuous dimming photosensors?

Accepted Answer

Calibrate the photosensor to maintain a consistent combined illuminance target from both daylight and electric light

Answer

Set the target illuminance to maximum fixture output regardless of daylight

Answer

Disable electric lighting entirely when any daylight is detected

Answer

Set photosensors to operate on a fixed time schedule independent of light levels

Question 2

What is the significance of measuring true RMS current versus average-sensing current when auditing circuits with non-linear loads?

Accepted Answer

True RMS meters account for harmonic distortion and provide accurate readings on non-linear loads

Answer

True RMS readings are always lower than average-sensing readings

Answer

Average-sensing meters accurately capture harmonic content

Answer

There is no practical difference for energy audit purposes

Question 3

During a walk-through audit of a retail store, the auditor notes that all exit signs use incandescent 20W lamps. What is the estimated annual energy savings per sign if replaced with 2W LED exit signs operating 8,760 hours per year?

Accepted Answer

Approximately 158 kWh per sign

Answer

Approximately 52 kWh per sign

Answer

Approximately 105 kWh per sign

Answer

Approximately 210 kWh per sign

Question 4

Which measurement is most critical for an energy auditor to take when evaluating the efficiency of a building's electrical distribution system?

Accepted Answer

Voltage drop between the service entrance and the furthest branch circuit panel

Answer

Ambient temperature at each electrical panel

Answer

Color temperature of installed lighting

Answer

Sound level of the main transformer

Question 5

A facility has 200 fluorescent fixtures controlled by a single switch for an open warehouse area. Which lighting control retrofit would an energy auditor most likely recommend for the greatest energy savings?

Accepted Answer

Implement wireless occupancy sensors with zone control and high-low dimming

Answer

Replace the single switch with a programmable timer only

Answer

Install bi-level switching to alternate rows of fixtures

Answer

Add manual dimmers at each aisle entrance

Question 6

What is the primary purpose of performing a motor load test using amperage measurements during an electrical systems energy audit?

Accepted Answer

To determine if the motor is oversized and operating below optimal efficiency

Answer

To verify the motor nameplate data matches the installation records

Answer

To check if the motor needs lubrication or bearing replacement

Answer

To measure the power factor of the entire building