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AEE Certified Energy Manager (CEM) Sample Questions:

1. If the initial design process includes group relamping, how can this reduce the number of lamps required to illuminate a space?

A) Group relamping requires using larger Wattage lamps, which means fewer lamps are required to illuminate a space
B) Group relamping reduces factors that contribute to light loss, which means fewer lamps are required to illuminate a space
C) Group relamping improves the room cavity ratio, which means fewer lamps are required to illuminate a space
D) Group relamping reduces the overall amount of lamp breakages, which means fewer lamps are required to illuminate a space.
E) Group relamping cannot reduce the number of lamps required to illuminate a space

2. In a performance contract, which group has the greatest investment risk?

A) Risk is shared by the terms in the performance contract
B) The energy-service company
C) The company installing the energy project
D) The equipment manufacturer

3. Natural gas costs $4.80/GJ. How much does it cost to heat 500 liters of water from 18°C to 50°C using a natural gas water heater with an efficiency of 85%? [The efficiency and fuel price are both based on HHV.
The specific heat of water (C) is 4.2 kJ/kg-°C.]

A) $0.76
B) $0.38
C) $1.44
D) $0.25
E) $1.25

4. According to the institute of Electrical and Electronic Engineers (IEEE) standard 519. "Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems." the maximum total harmonic distortion (THD) for general low voltage systems less than 600 votts) should be:
SELECT THE CORRECT ANSWER

A) Less than 5%
B) Less than 1%
C) Greater than 1%
D) Less than 10%
E) Less than 20%

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

Solutions: