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AEE Certified Energy Manager (CEM) Sample Questions:

1. A high-pressure steam system passes 180°C condensate (saturated liquid) through a steam trap to an atmospherically vented condensate receiver tank. If the steam trap is working properly, how much of the condensate mass can be lost out the vent of the receiver tank in the form of flash steam?

A) 66%
B) 6%
C) 15%
D) 100%
E) 25%

2. An energy-saving project saves $30,000 per year. The project life is 10 years and the company minimum annual rate of return (MARR) is 15%. How much can the project cost and still be cost effective?

A) $188,343
B) $150,570
C) $165,903
D) $201,123
E) $198,992

3. Which of the following controls can optimize the operation of lighting systems?

A) Timer
B) All of the above
C) Occupancy sensors
D) Dimming ballasts
E) Photocells

4. 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) 42.7%
C) 28.4%
D) 34.9%

5. How does an enthalpy-based economizer control operate?

A) Comparing the difference in dry-bulb air temperature measurements of the return air and the outdoor air
B) Using the dry-bulb temperature and relative humidity of both the outdoor-air and return-air
C) Measuring the outdoor air dry-bulb temperature and relative humidity
D) Using a constant mixed air proportion control sequence

Solutions: