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AEE Certified Energy Manager (CEM) Sample Questions:

1. 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 < 0%
B) IRR = 15%
C) IRR > 15%
D) IRR < 15%

2. 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) $70.97/year
B) $64.66/year
C) $44.88/year
D) $88.29/year
E) $52.20/year

3. An air conditioning unit cools make-up air from 25°C (dry bulb temperature) and 50% relative humidity down to 13°C. What type of heat has been removed from the air?

A) Sensible heat
B) No heat energy has been removed
C) Latent heat
D) Both sensible and latent heat

4. What does a manometer measure?

A) Pressure
B) Volume
C) Voltage
D) Distance

5. A 3 MW rated wind-powered turbine has a rotor diameter of 113 meters. What is the efficiency of the wind turbine at rated power if it is operating in wind power calculated at 8.6 MW? Assume an air density of 1.225 kg/m³.

A) 34.9%
B) 59.3%
C) 28.4%
D) 42.7%

Solutions: