Certified Energy Auditor Certification Certified Energy Auditor Lighting and Electrical Systems Questions and Answers 2

Question 1

What is the primary advantage of using LED T8 retrofit tubes over magnetic ballast fluorescent T12 systems in commercial buildings?

Accepted Answer

Energy savings of 40-60% with longer lamp life

Answer

Higher color rendering index only

Answer

Increased heat output for space heating

Answer

Compatibility with existing magnetic ballasts without modification

Question 2

During an energy audit of an office building, you measure a power factor of 0.72 on the main electrical panel. What is the most likely consequence of this low power factor?

Accepted Answer

Utility penalty charges and increased apparent power demand

Answer

Reduced lighting output across the facility

Answer

Immediate risk of electrical fire

Answer

Automatic shutdown of HVAC systems

Question 3

An energy auditor discovers that a warehouse uses 400W metal halide high-bay fixtures operating 16 hours per day. Which replacement strategy offers the greatest energy reduction?

Accepted Answer

Install 150W LED high-bay fixtures with occupancy sensors

Answer

Replace with 250W metal halide fixtures

Answer

Switch to 320W pulse-start metal halide lamps

Answer

Add reflectors to existing fixtures

Question 4

What does a demand response program typically require from a commercial building's electrical system during peak grid events?

Accepted Answer

Temporarily reducing electrical load by curtailing non-critical systems

Answer

Switching all lighting to emergency battery backup

Answer

Permanently disconnecting from the utility grid

Answer

Increasing generator output to feed power back to the grid

Question 5

When conducting a lighting audit, an energy auditor calculates that a space has 1.3 watts per square foot of installed lighting power density. According to ASHRAE 90.1 for a typical open office, what conclusion should the auditor draw?

Accepted Answer

The lighting power density exceeds the code maximum and represents a savings opportunity

Answer

The space meets current energy code requirements

Answer

The measurement indicates insufficient lighting for occupant comfort

Answer

The space requires additional task lighting

Question 6

Which harmonic distortion issue is most commonly associated with large installations of electronic ballasts and LED drivers on a commercial electrical system?

Accepted Answer

Third-order harmonics causing neutral conductor overheating

Answer

Increased voltage at the service entrance

Answer

Reduced ground fault protection sensitivity

Answer

Phase imbalance between utility feeders