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AEE Certified Energy Manager (CEM) Sample Questions:

1. Lighting systems operate with a certain recoverable light loss factor. Control systems with photocell sensor inputs combined with dimming ballasts can be used to regulate dimming levels to maintain a continuous light level in the work space. Which of the following best describes this type of control?

A) Two-position controller
B) Demand-limiting controller
C) Open-loop controller
D) Closed-loop controller

2. Which of the following is/are benefits of commissioning?

A) Ensures staff know how to operate a system as intended
B) Ensures a system is designed to operate as intended
C) Ensures staff know how to maintain a system as intended
D) All of the above
E) Ensures a system is installed to operate as intended

3. According to the institute of Electrical and Electronic Engineers (IEEE) standard 519. "Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems." the maximum total harmonic distortion (THD) for general low voltage systems less than 600 votts) should be:
SELECT THE CORRECT ANSWER

A) Less than 5%
B) Greater than 1%
C) Less than 10%
D) Less than 20%
E) Less than 1%

4. What term describes the difference between the control signal value and the set point?

A) Error or offset
B) Differential
C) Cut off
D) Dead time
E) Dead band

5. A new energy-efficient boiler costs $60,890 to buy and install. The new energy-efficient boiler will save
$15,400 per year and last for 20 years. What is the internal rate of return (IRR) of the project?

A) 20%
B) 25%
C) 30%
D) 10%
E) 15%

Solutions: