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AEE CEM Exam Syllabus Topics:

AEE Certified Energy Manager (CEM) Sample Questions:

1. In a warehouse, lights are mounted 4 meters above the floor. This provides an average light level of 150 lux.
To increase the light level without installing more lights or higher Wattage lights, you lower the light fixtures with pendants so that the lights are located 3.25 meters above the floor. Calculate the new average light level on the floor.

A) 276 lux
B) 150 lux
C) 166 lux
D) 176 lux
E) 227 lux

2. Using a degree-day base of 18°C, calculate the number of cooling degree days (CDD) if the outside temperature is a uniform 25°C throughout the year (365 days/year).

A) 2,250 CDD/yr
B) 1,955 CDD/yr
C) 1,845 CDD/yr
D) 2,975 CDD/yr
E) 2,555 CDD/yr

3. A 55-kW motor at full load is used to drive a pump that generates 50 meters of head while pumping water at a rate of 5,000 liters per minute. Calculate the pump efficiency.

A) 62%
B) 74%
C) 88%
D) 58%

4. 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) 48,250 liters/minute
C) 22,750 liters/minute
D) 8,250 liters/minute
E) 16,500 liters/minute

5. A cooling tower delivers 29°C water to a central chilled water plant. The cooling tower is capable of delivering water to the chilled-water plant with a 6°C approach temperature to the ambient wet bulb temperature. Using this information, what type of control strategy would you recommend be added to the cooling tower operation to save additional energy?

A) Chilled-water temperature reset
B) Static-pressure reset
C) Condenser-water temperature reset
D) Chiller demand limiting

Solutions: