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AEE Certified Energy Manager (CEM) Sample Questions:

1. The temperature in an unconditioned mechanical room is found to typically be around 23°C warmer than ambient air. If the air intake of an air compressor located in the mechanical room is routed through a nearby wall so that ambient air is fed directly to the air compressor's intake, what impact can be expected on the air compressor's energy requirement?

A) Decrease energy use by 7.6%
B) Decrease energy use by 3.8%
C) Increase energy use by 3.8%
D) Increase energy use by 7.6%
E) No measureable change in energy use

2. Lighting systems operate with a certain recoverable light loss factor. Control systems with photocell sensor inputs combined with dimming ballasts can be used to regulate dimming levels to maintain a continuous light level in the work space. Which of the following best describes this type of control?

A) Closed-loop controller
B) Open-loop controller
C) Two-position controller
D) Demand-limiting controller

3. 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) $21 /GJ
B) $33 /GJ
C) $15/GJ
D) $25 /GJ

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

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

5. A building is conditioned by an air-conditioning and heating system. What technology can directly prevent simultaneous heating and cooling of the space?

A) Derivative control
B) Air handling unit
C) Variable air volume control
D) Setback thermostat
E) Indoor air quality sensors

Solutions: