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

2. An outdoor parking area has 25 light poles. Each pole has a 420 Watt (ballast included) high-pressure sodium (HPS) luminaire. The parking area lights are illuminated 4,500 hours per year and the electricity cost is $0.08
/kWh. What is the annual energy cost reduction if each luminaire is replaced with a 220-Watt (driver included) LED luminaire?

A) $1,200/yr
B) $1,800/yr
C) $2,600/yr
D) $1,500/yr
E) $2,200/yr

3. Which of the following best describes a thermally-light building?

A) An underground storage facility
B) A single-story office building where the load on the heating and cooling system is proportional to the outside air (ambient) temperature
C) A computer data center housing multiple internet server racks
D) A building filled with manufacturing and process equipment

4. What is the purpose of top (or skimming) blowdown in a steam boiler?

A) To flush out the boiler room drain system
B) To reduce the buildup of feedwater chemicals in the boiler
C) To reduce the buildup of sediment in the boiler
D) To dilute the level of impurities in the boiler water thus allowing the addition of cleaner make up water

5. A 1OO-kW packaged engine-generate combined heat and power (CHP) system has the specifications listed below. The CHP equipment operates fully loaded for 8.000 h/yr. What isthe annual fuel cost for the ChP equipment?
CMP equipment specifications: Electrical output 100kw Electrical efficiency: 25% Thermal recovery efficiency: 50*6 Total CMP efficiency: 75% Additional information: Fuel cost: S3.S0/GJ Electricity cost S0.06/kWh Previous water heating efficiency:
8046 Mot water usage: 75,700 liters/day (21 *C temperature rise)
[The question from the previous image, which was about calculating the annual cost of heat loss through a wall, but had a discrepancy between the calculated cost and the provided answer choices]

A) $43,776/yr
B) $52,222/yr
C) $58,300/yr
D) $32,668/yr
E) $28,900/yr

Solutions: