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AEE Certified Energy Manager (CEM) Sample Questions:

1. What is the main cause of low power factor?

A) Fluorescent lighting
B) Computers and electronic equipment
C) Harmonics
D) Solar flares
E) Low-load induction motors

2. A facility replaces a natural gas heating system rated at 10,000 kJ/h and 80% efficiency with an electric heat pump rated at 10,000 kJ/h and a coefficient of performance (COP) of 2.3. Will this project also reduce the annual energy utilization index (EUI) for the facility?

A) No
B) Yes

3. What type of heat transfer is reduced by adding insulation to the inside surface of a wall?

A) Conduction
B) Convection
C) Radiation

4. Using the lumen method, calculate the number of luminaires (fixtures) required to light a room to 200 lux.
Each luminaire has 2 fluorescent lamps, 3,000 lumens per lamp. The room is 20 meters by 30 meters. The total light loss factor (LLF) is 0.70 and the luminaire coefficient of utilization (CU) is 0.80.

A) 36 luminaires
B) 48 luminaires
C) 60 luminaires
D) 24 luminaires
E) 12 luminaires

5. A hot-water boiler has a cut-in set point of 65°C on the hot water supply temperature and a differential set point of 10°C. What is the hot-water supply temperature that causes the boiler to turn off?

A) It depends on the return water temperature
B) 55°C
C) 75°C
D) 65°C

Solutions: