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AEE Certified Energy Manager (CEM) Sample Questions:

1. An energy-saving project costs $540,000. The project will have maintenance costs of $25,000 per year. The energy savings from the project are $160,000 per year. What is the simple payback of the project?

A) 4.0 years
B) 3.0 years
C) 2.0 years
D) 5.0 years

2. Which of the following statements regarding refrigerants is NOT correct?
5ELECT THE CORRECT ANSWER

A) R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact
B) R-32 and R-134a are Hydro Fluoro Carbons with zero ozone depleting potential, and significant global warming impact
C) R-11 and R-12 are Chloro Fluoro Carbons with significant ozone depleting potential
D) R-1234yf is a Hydro Fluoro Olefin with zero ozone depleting potential, and little global warming potential
E) R-407C is a blended Hydro Fluoro Carbon or near Azeotropic mixture, and can be used as a replacement for R-22 in commercial applications

3. Which type of lighting control technique operates in "manual on" and "auto-off mode, and can be used in situations where there is brief occupancy that do not need lights on?

A) Vacancy sensor
B) PIR/Microphonics dual technology
C) Microphonics technology
D) Occupancy sensor
E) Photocell control

4. A cooling tower delivers 29°C water to a central chilled water plant. The cooling tower is capable of delivering water to the chilled-water plant with a 6°C approach temperature to the ambient wet bulb temperature. Using this information, what type of control strategy would you recommend be added to the cooling tower operation to save additional energy?

A) Condenser-water temperature reset
B) Chiller demand limiting
C) Static-pressure reset
D) Chilled-water temperature reset

5. 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) 1.2
B) 1.4
C) 0.6
D) 1.6
E) 0.8

Solutions: