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AEE Certified Energy Manager (CEM) Sample Questions:

1. What is a common cause of poor power quality?

A) Incandescent lighting
B) Synchronous motors
C) Natural gas turbine power generation by utilities
D) Electronic equipment, such as personal computers
E) Partially loaded induction motors

2. A three phase, 380.volt system has the following voltage measurements:
Va = 375$ volts
Vb = 380$ volts
Vc = 391$ volts
Calculate the percent voltage imbalance.
SELECT THE CORRECT ANSWER

A) 3.4%
B) 2.4%
C) 1.1%
D) 6.2%
E) 5.5%

3. An energy-saving project costs $540,000. The project will have maintenance costs of $25,000 per year. The energy savings from the project are $160,000 per year. The project has a life of 10 years with no salvage value. The minimum attractive rate of return (MARR) is 10%. Using end-of-year cash flows, calculate the net- present value (NPV) of the project.

A) $311,556
B) $289,575
C) $456,254
D) $154,657

4. Natural gas costs $4.80/GJ. How much does it cost to heat 500 liters of water from 18°C to 50°C using a natural gas water heater with an efficiency of 85%? [The efficiency and fuel price are both based on HHV.
The specific heat of water (C) is 4.2 kJ/kg-°C.]

A) $0.25
B) $0.76
C) $0.38
D) $1.44
E) $1.25

5. A fully-loaded heat pump unit delivers 36-kW thermal heating with a power draw of 12-kW electric. What is the coefficient of performance (COP) at full load?

A) 5.0
B) 3.0
C) 2.0
D) 4.0
E) 6.0

Solutions: