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AEE Certified Energy Manager (CEM) Sample Questions:

1. Which problems can be caused by poor power quality?

A) Induction motors running backwards
B) All of the above
C) Equipment overheating
D) Circuit breakers tripping
E) Answers B and C

2. A controller has a signal output that can range from 4 to 20 mA (milli-amperes). The controller regulates the output temperature from a three-way mixing valve from 5°C to 15°C. What is the control gain?

A) 0.6
B) 1.4
C) 0.8
D) 1.2
E) 1.6

3. Which of the following statements regarding refrigerants is NOT correct?
5ELECT THE CORRECT ANSWER

A) R-32 and R-134a are Hydro Fluoro Carbons with zero ozone depleting potential, and significant global warming impact
B) R-1234yf is a Hydro Fluoro Olefin with zero ozone depleting potential, and little global warming potential
C) R-11 and R-12 are Chloro Fluoro Carbons with significant ozone depleting potential
D) R-407C is a blended Hydro Fluoro Carbon or near Azeotropic mixture, and can be used as a replacement for R-22 in commercial applications
E) R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact

4. A facility replaces a natural gas heating system rated at 10,000 kJ/h and 80% efficiency with an electric heat pump rated at 10,000 kJ/h and a coefficient of performance (COP) of 2.3. Will this project also reduce the annual energy utilization index (EUI) for the facility?

A) Yes
B) No

5. A controlled valve is full closed when it gets a signal of 4 mA. The valve is full open when it gets a signal of
20 mA. With a control signal of 8 mA, what is the valve position?

A) 75% open
B) 82% open
C) 45% open
D) 25% open
E) 12.5% open

Solutions: