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AEE Certified Energy Manager (CEM) Sample Questions:

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

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

2. A compressed air system has a total volume of 247,500 liters. During a 30-minute break in production (air compressor system turned off and no production demand for compressed air), the system pressure drops from
7 bar, gauge (700 kPa, gauge) to 5 bar, gauge (500 kPa, gauge). Calculate the leakage rate in the compressed air system.

A) 32,000 liters/minute
B) 22,750 liters/minute
C) 16,500 liters/minute
D) 8,250 liters/minute
E) 48,250 liters/minute

3. Periodic commissioning of a building automation system (BAS) might include which of the following?

A) Removing temperature set point overrides
B) Answers A and C
C) Retraining staff on the BAS functions and programming
D) Verify controls are still responsive to the BAS
E) All of the above

4. An air-conditioning system at full load is rated at 70-kW (thermal cooling) and has a coefficient of performance (COP) of 4.1. What is the electrical load at full load?

A) 70.0 kW
B) 46.7 kW
C) 17.1 kW
D) 35.0 kW
E) 23.3 kW

5. What instrument determines flow rate by measuring pressure differential?

A) Hot-wire anemometer
B) Pitot tube
C) Psychrometer
D) Infrared camera
E) Ultrasonic flow meter

Solutions: