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

2. According to the institute of Electrical and Electronic Engineers (IEEE) standard 519. "Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems." the maximum total harmonic distortion (THD) for general low voltage systems less than 600 votts) should be:
SELECT THE CORRECT ANSWER

A) Less than 1%
B) Less than 5%
C) Less than 10%
D) Greater than 1%
E) Less than 20%

3. You are using a performance contract to finance the added cost of using more-efficient equipment in the construction of a new building. Which of the following International Performance Measurement and Verification Protocol (IPMVP) options would you use to verify annual energy savings?

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

4. An air-conditioning unit delivers 10,000 kJ/h (thermal cooling). The equipment uses single-phase electrical power at 220-volt and 5.25 amps with a power factor of 100%. Calculate the coefficient of performance (COP).

A) 13.2
B) 6.2
C) 16.1
D) 3.2
E) 2.4

5. A high-pressure steam system passes 180°C condensate (saturated liquid) through a steam trap to an atmospherically vented condensate receiver tank. If the steam trap is working properly, how much of the condensate mass can be lost out the vent of the receiver tank in the form of flash steam?

A) 6%
B) 25%
C) 15%
D) 66%
E) 100%

Solutions: