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AEE Certified Energy Manager (CEM) Sample Questions:

1. 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

2. An outdoor parking area has 25 light poles. Each pole has a 420 Watt (ballast included) high-pressure sodium (HPS) luminaire. The parking area lights are illuminated 4,500 hours per year and the electricity cost is $0.08
/kWh. What is the annual energy cost reduction if each luminaire is replaced with a 220-Watt (driver included) LED luminaire?

A) $1,200/yr
B) $2,600/yr
C) $1,800/yr
D) $1,500/yr
E) $2,200/yr

3. A controller has a signal output that can range from 4 to 20 mA (milli-amperes). The controller regulates the output temperature from a three-way mixing valve from 5°C to 15°C. What is the control gain?

A) 1.6
B) 0.8
C) 1.4
D) 0.6
E) 1.2

4. 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) Open-loop controller
C) Demand-limiting controller
D) Two-position controller

5. If installed without ancillary equipment, photovoltaic power cells generate what type of power?

A) Direct current
B) Sinusoidal alternating current
C) Square-wave alternating current

Solutions: