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AEE CEM Exam Syllabus Topics:

AEE Certified Energy Manager (CEM) Sample Questions:

1. Problems Caused by Harmonic Distortion
Which of the following problems is unlikely to be caused by harmonic distortion?
SELECT THE CORRECT ANSWER

A) Degraded power factor C. Lighting "flicker"
B) "Nuisance" tripping of circuit breakers
C) Torque pulsation in motors
D) Circulating currents in motor shafts

2. What is the definition of lamp life for a fluorescent lamp?

A) The time at which lumen output has reduced to 70% of the initial light output
B) The time at which lamps begin to fail
C) The time at which 50% of a large sample of lamps have failed
D) The time at which lumen output has reduced by 50%
E) The time at which 70% of a large sample of lamps have failed

3. A gas-fired boiler is operating with 31.9% excess air. A feedwater economizer is used to reduce the stack temperature rise from 310°C to 160°C. Using the natural gas combustion efficiency tables in your workbook, find the energy savings from the economizer as a percentage of historical fuel consumption.

A) 3.1%
B) 5.8%
C) 1.2%
D) 9.3%
E) 7.1%

4. Using the lumen method, calculate the number of luminaires (fixtures) required to light a room to 200 lux.
Each luminaire has 2 fluorescent lamps, 3,000 lumens per lamp. The room is 20 meters by 30 meters. The total light loss factor (LLF) is 0.70 and the luminaire coefficient of utilization (CU) is 0.80.

A) 48 luminaires
B) 60 luminaires
C) 12 luminaires
D) 36 luminaires
E) 24 luminaires

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

Solutions: