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

2. A cooling tower delivers water to a chilled-water plant at 21°C. The outside ambient air conditions are 19°C dry bulb, 50% relative humidity. Using the psychrometric chart, what is the approach temperature of the cooling tower outlet water temperature to the ambient air wet-bulb temperature?
SELECT THE CORRECT ANSWER

A) 4°C
B) 10°C
C) 8°C
D) 6°C

3. Which type of single-phase alternating-current motor has the highest efficiency?

A) Electronic-commutated motor
B) Shaded-pole motor
C) Permanent split-capacitor motor

4. A new lighting system costs $60,000. The new lighting system has a 15-year life and the minimum required rate of return (MARR) is 15%. How much must the new lighting system save to be life-cycle cost effective?

A) $33,200/year
B) $15,650/year
C) $10,260/year
D) $27,090/year
E) $12,556/year

5. How much energy (kJ) is required to heat 2 kg of water from 25°C to 2 kg of water at 100°C? (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 630 kJ
B) 840 kJ
C) 420 kJ
D) 510 kJ

Solutions: