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AEE Certified Energy Manager (CEM) Sample Questions:

1. What term describes the difference between the control signal value and the set point?

A) Cut off
B) Dead band
C) Differential
D) Dead time
E) Error or offset

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

3. 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) 16,500 liters/minute
B) 48,250 liters/minute
C) 32,000 liters/minute
D) 8,250 liters/minute
E) 22,750 liters/minute

4. At the end of a performance contract, who owns the equipment installed by the project?

A) The bank
B) The equipment manufacturer
C) The company that paid the contract payments
D) The energy service company

5. In a chilled water thermal energy storage system, chilled water is stored at 4°C and used for supply water.
Chilled water return is 14°C. Calculate the storage capacity required to hold 50 GJ of thermal cooling. (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 1,356 m³
B) 766 m³
C) 2,618 m³
D) 1,191 m³
E) 4,180 m³

Solutions: