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AEE Certified Energy Manager (CEM) Sample Questions:

1. 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) $32,668/yr
B) $43,776/yr
C) $52,222/yr
D) $58,300/yr
E) $28,900/yr

2. Which of the following International Performance Measurement and Verification Protocol (IPMVP) options would you use to verify annual energy savings in a project that upgraded lighting in a large manufacturing plant?

A) Option D - Calibrated simulation
B) Option C - Whole facility measurement
C) Option B - Retrofit isolation: all parameter measurement
D) Option E - Stipulated savings
E) Option A - Retrofit isolation: key parameter measurement

3. What type of passive heat exchanger can wrap around an evaporator coil to precool entering air and reheat the air after the cooling coil without adding more moisture to the supply air stream?

A) Plate and frame
B) Run-around coil
C) Desiccant heat wheel
D) Heat pipe
E) Heat pump

4. A desk lamp is located inside a windowless office. The office is heated during the winter and cooled during the summer. When the lamp is switched on, how much of the energy consumed by the lamp becomes heat in the office space?

A) 100%
B) 120%
C) 80%
D) 25%

5. A 75-kW induction motor operates at 80% partial load and 88% efficiency. A new high-efficiency 75-kW motor can be installed that will operate at 95% efficiency (also at 80% partial load). What is the reduction in electric power demand?

A) 4 kW
B) 2 kW
C) 5 kW
D) 1 kW
E) 8 kW

Solutions: