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

LED T8 retrofits typically deliver 40-60% energy savings over T12 fluorescent systems while lasting 2-3 times longer.

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

A power factor below 0.85 typically triggers utility penalty charges because the facility draws more apparent power (kVA) than real power (kW).

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

150W LED high-bays with occupancy sensors can reduce energy use by over 75% compared to 400W metal halide through both wattage reduction and controls.

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

Demand response programs ask participants to temporarily shed or curtail non-critical electrical loads during peak demand periods in exchange for financial incentives.

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

ASHRAE 90.1 sets open office lighting power density allowances near 0.61-0.82 W/sq ft, so 1.3 W/sq ft significantly exceeds the standard.

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Practice Test

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