Certified Energy Auditor Certification Lighting and Electrical Systems 2

Question 1

What is the Color Rendering Index (CRI) minimum value recommended for office environments to maintain visual comfort?

Accepted Answer

CRI 80

Answer

A CRI of 80 or above is the standard recommendation for office environments to ensure accurate color perception and visual comfort.

Question 2

Which ballast type provides the highest energy efficiency for fluorescent lamps?

Accepted Answer

Electronic ballast

Answer

Electronic ballasts operate at high frequency (20,000+ Hz), eliminating flicker and reducing energy losses compared to magnetic ballasts.

Question 3

A building's power factor is 0.72. Which corrective measure would most directly improve this at the source?

Accepted Answer

Adding capacitor banks

Answer

Capacitor banks supply reactive power locally, reducing the reactive current drawn from the utility and improving the power factor.

Question 4

What does the term 'lamp lumen depreciation' (LLD) refer to in lighting audits?

Accepted Answer

The reduction in light output as a lamp ages

Answer

LLD describes the predictable decline in lumens produced by a lamp over its rated life, which affects maintained illuminance calculations.

Question 5

An energy auditor finds demand charges constitute 40% of the facility's electric bill. Which strategy directly reduces demand charges?

Accepted Answer

Implementing peak load shifting with lighting controls

Answer

Demand charges are based on peak 15- or 30-minute intervals; shifting or curtailing lighting loads during peak periods directly lowers the billed demand.

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Lighting and Electrical Systems 2