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AEE Certified Energy Manager (CEM) Sample Questions:

1. How can you tell if steam traps in a steam distribution system may NOT be working correctly?

A) An increase in make-up water requirements relative to steam demand
B) No sound from inverted bucket steam traps
C) Rapid chattering of disk steam traps
D) All of the above
E) Robust flash steam rising from condensate receiver tank vent pipes

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

A) R-1234yf is a Hydro Fluoro Olefin with zero ozone depleting potential, and little global warming potential
B) 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
C) R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact
D) R-11 and R-12 are Chloro Fluoro Carbons with significant ozone depleting potential
E) R-32 and R-134a are Hydro Fluoro Carbons with zero ozone depleting potential, and significant global warming impact

3. A high-pressure steam system passes 180°C condensate (saturated liquid) through a steam trap to an atmospherically vented condensate receiver tank. If the steam trap is working properly, how much of the condensate mass can be lost out the vent of the receiver tank in the form of flash steam?

A) 66%
B) 6%
C) 100%
D) 25%
E) 15%

4. 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) The delay in response of a system to a controlled change
C) A value that has been assigned to a controlled variable
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

5. You are using a performance contract to finance the added cost of using more-efficient equipment in the construction of a new building. Which of the following International Performance Measurement and Verification Protocol (IPMVP) options would you use to verify annual energy savings?

A) Option B - Retrofit isolation: all parameter measurement
B) Option A - Retrofit isolation: key parameter measurement
C) Option D - Calibrated simulation
D) Option E - Stipulated savings
E) Option C - Whole facility measurement

Solutions: