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

2. Insulation has a thermal conductivity of 0.04 Watt/(m-°C). What is the R-value for this insulation when it is 5- cm thick?

A) 0.8 (m²-°C)/Watt
B) 2.20 Watt/m²
C) 20 (m²-°C)/Watt
D) 1.25 (m²-°C)/Watt
E) 20 Watt/(m²-°C)

3. A 7 bar (gauge pressure) compressed air system has 5 leaks that are 3 mm in diameter and 3 leaks that are 6 mm in diameter. The compressed-air system is pressurized 8,760 hours per year. Electricity cost is $0.10
/kWh. What is the annual cost of the leaks in the compressed air system?

A) $30,910/yr
B) $25,220/yr
C) $56,500/yr
D) $48,480/yr
E) $18,150/yr

4. Which of the following is a closed-loop controller?

A) Manual dimmer for a light switch
B) Accelerator pedal in an automobile
C) Thermostat for an air conditioning unit
D) Time clock schedule controller

5. 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) 25%
B) 120%
C) 100%
D) 80%

Solutions: