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

2. A cooling tower delivers 29°C water to a central chilled water plant. The cooling tower is capable of delivering water to the chilled-water plant with a 6°C approach temperature to the ambient wet bulb temperature. Using this information, what type of control strategy would you recommend be added to the cooling tower operation to save additional energy?

A) Chilled-water temperature reset
B) Static-pressure reset
C) Condenser-water temperature reset
D) Chiller demand limiting

3. An air-conditioning system at full load is rated at 70-kW (thermal cooling) and has a coefficient of performance (COP) of 4.1. What is the electrical load at full load?

A) 17.1 kW
B) 70.0 kW
C) 23.3 kW
D) 46.7 kW
E) 35.0 kW

4. When should commissioning be included in the design and construction of a facility?

A) When the planning process begins
B) When the occupancy permit is accepted
C) When the design is finalized
D) When installation of the energy systems begins
E) When construction is finalized

5. Which is the best application for variable-speed drives?

A) Waste-water sewer lift pump
B) Centrifugal fan motor in a variable-air volume air-conditioning system
C) Reciprocating air compressor
D) Centrifugal fan motor in a multi-zone air conditioning system

Solutions: