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AEE Certified Energy Manager (CEM) Sample Questions:
1. 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) PIR/Microphonics dual technology
B) Microphonics technology
C) Photocell control
D) Vacancy sensor
E) Occupancy sensor
2. 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) 24 luminaires
B) 48 luminaires
C) 12 luminaires
D) 36 luminaires
E) 60 luminaires
3. Thermal scans of electrical equipment are useful for:
A) Locating a loose electrical connection
B) Locating areas of high power factor
C) Reading current carrying capacity of installed conductors
D) Measuring the load on a refrigerant system
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) 28.4%
B) 59.3%
C) 42.7%
D) 34.9%
5. In a performance contract, which group has the greatest investment risk?
A) The equipment manufacturer
B) The company installing the energy project
C) The energy-service company
D) Risk is shared by the terms in the performance contract
Solutions:
Question # 1 Answer: E | Question # 2 Answer: D | Question # 3 Answer: A | Question # 4 Answer: D | Question # 5 Answer: C |