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

2. You can buy air compressor A for $15,000 or air compressor B for $6,000. Compressor A will cost $10,000 per year to operate. Compressor B will cost $11,500 per year to operate. If both air compressors have a 10- year life and your required return on investment is 12%, which air compressor has the lowest total life-cycle cost?

A) Compressor A
B) Compressor B
C) Both air compressors have the same life-cycle cost

3. What is a common method to reduce the impact of voltage imbalance?

A) Install capacitors to improve power factor on three-phase loads
B) Install harmonic filters
C) Rebalance single-phase loads
D) Reverse phase connections on three-phase motors

4. What does a manometer measure?

A) Distance
B) Pressure
C) Volume
D) Voltage

5. Using a degree-day base of 18°C, calculate the number of cooling degree days (CDD) if the outside temperature is a uniform 25°C throughout the year (365 days/year).

A) 2,250 CDD/yr
B) 2,975 CDD/yr
C) 1,955 CDD/yr
D) 2,555 CDD/yr
E) 1,845 CDD/yr

Solutions: