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AEE Certified Energy Manager (CEM) Sample Questions:

1. If a boiler cycles on and off too frequently, what control can you adjust to reduce the number of times a boiler cycles on and off?

A) Reduce the controller differential
B) Increase the controller differential
C) Increase the controller set point

2. Which of the following is NOT included in commissioning documentation?

A) Original facility and equipment design intent
B) As-built drawings
C) Financing payment structure reports
D) Equipment operations and maintenance manuals
E) Equipment control sequence documentation

3. Which of the following is/are benefits of commissioning?

A) Ensures a system is designed to operate as intended
B) Ensures a system is installed to operate as intended
C) Ensures staff know how to operate a system as intended
D) All of the above
E) Ensures staff know how to maintain a system as intended

4. A gas-fired boiler is operating with 31.9% excess air. A feedwater economizer is used to reduce the stack temperature rise from 310°C to 160°C. Using the natural gas combustion efficiency tables in your workbook, find the energy savings from the economizer as a percentage of historical fuel consumption.

A) 9.3%
B) 3.1%
C) 7.1%
D) 1.2%
E) 5.8%

5. Electricity costs SO. 10 per kWh. if an electric water heater has an efficiency of 95*6. what is the equivalent price of natural gas per Gigajoule for a natural gas water heater? The natural gas water heater has an efficiency of 95*t based on lower-heating value.
[Natural gas has an energy content of 36.400 K|/m3 (higher-heating value) and 32-760 K/m3 (lower-heating value).] SELECT THE CORRECT ANSWER

A) $33 / GJ
B) $21 / GJ
C) $15/GJ
D) $25 / GJ

Solutions: