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AEE Certified Energy Manager (CEM) Sample Questions:

1. You can buy air compressor A for $15,000 or air compressor B for $6,000. Compressor A will cost $10,000 per year to operate. Compressor B will cost $11,500 per year to operate. If both air compressors have a 10- year life and your required return on investment is 12%, which air compressor has the lowest total life-cycle cost?

A) Compressor B
B) Both air compressors have the same life-cycle cost
C) Compressor A

2. What is a common method to reduce the impact of voltage imbalance?

A) Rebalance single-phase loads
B) Install harmonic filters
C) Install capacitors to improve power factor on three-phase loads
D) Reverse phase connections on three-phase motors

3. Which motor parameter is the most difficult to measure with precision?

A) Alternating current (AC) frequency
B) Output power capacity
C) Operating (rotating) speed
D) Input power
E) Operating load factor

4. A piece of equipment costs $250,000 to buy and install. The annual operating cost for the equipment is
$50,000 per year. The equipment will last 15 years. After 15 years, the equipment will have no net salvage value. The annual interest rate is 10%. What is the present value of the life-cycle cost to own and operate the equipment? Use end-of-year annual cash flow analysis.

A) $630,300
B) $250,000
C) $756,113
D) $556,945

5. Which of the following best describes a dead band in controls?

A) A system which changes the output of a controller based on how fast a variable is moving from or to a set point
B) A value that has been assigned to a controlled variable
C) The delay in response of a system to a controlled change
D) The difference between a sensor variable and its set point
E) A range around a set point with no change in state even though there is a change in sensor input

Solutions: