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AEE Certified Energy Manager (CEM) Sample Questions:

1. A new energy-efficient boiler costs $60,890 to buy and install. The new energy-efficient boiler will save
$15,400 per year and last for 20 years. What is the internal rate of return (IRR) of the project?

A) 30%
B) 25%
C) 20%
D) 15%
E) 10%

2. Air is heated from 10°C (dry bulb temperature) and 80% relative humidity to 32°C (dry bulb temperature).
What is the new relative humidity?

A) 30%
B) 60%
C) 40%
D) 80%
E) 20%

3. A heat pump water heater has an annual average coefficient of performance (COP) of 2.1 and heats water from 15°C to 50°C. Hot water use is 100 liters per day, 365 days/yr. The electricity cost is $0.10/kWh. What is the annual water heating cost? (The specific heat of water (C) is 4.2 kJ/kg-°C.)

A) $52.20/year
B) $44.88/year
C) $88.29/year
D) $64.66/year
E) $70.97/year

4. Using an interest rate of 15%, an energy project has a net-present value (NPV) of $3,500. Which statement is true about the project's internal rate of return (IRR)?

A) IRR < 15%
B) IRR < 0%
C) IRR > 15%
D) IRR = 15%

5. 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) $25,220/yr
B) $56,500/yr
C) $48,480/yr
D) $30,910/yr
E) $18,150/yr

Solutions: