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AEE Certified Energy Manager (CEM) Sample Questions:

1. Some international electric utilities use 'net metering" for customers with renewable energy equipment, such as photovoltaic power panels. Which of the following best describes net metering with regard to excess power generation and utility billing practices?
SELECT THE CORRECT ANSWER

A) Accept excess electric energy generated by a customer's energy system, the value of which can offset the value of energy consumed by the customer over the net metering period
B) Accept excess electric energy generated by a customer's energy system but with no financial compensation for the energy fed into the utility's transmission system
C) Transmit electric energy generated by a customer's energy system so that the customer may sell the excess electricity to another company on the transmission system

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

A) R-32 and R-134a are Hydro Fluoro Carbons with zero ozone depleting potential, and significant global warming impact
B) R-1234yf is a Hydro Fluoro Olefin with zero ozone depleting potential, and little global warming potential
C) R-11 and R-12 are Chloro Fluoro Carbons with significant ozone depleting potential
D) 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
E) R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact

3. 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. The project has a life of 10 years with no salvage value. The minimum attractive rate of return (MARR) is 10%. Using end-of-year cash flows, calculate the net- present value (NPV) of the project.

A) $289,575
B) $154,657
C) $456,254
D) $311,556

4. An office building is illuminated with T8 fluorescent lamps. Which of the following is the best schedule for group relamping (total replacement of all the T8 fluorescent lamps in the building)?

A) Every 4 years
B) When 25% of the lamps have failed
C) When 20% of the ballasts have failed
D) When the building owner changes
E) When you reach 70% of the rated lamp life

5. A 3 MW rated wind-powered turbine has a rotor diameter of 113 meters. What is the efficiency of the wind turbine at rated power if it is operating in wind power calculated at 8.6 MW? Assume an air density of 1.225 kg/m³.

A) 59.3%
B) 34.9%
C) 42.7%
D) 28.4%

Solutions: