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AEE Certified Energy Manager (CEM) Sample Questions:

1. 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) 25%
C) 6%
D) 15%
E) 100%

2. A cooling tower delivers water to a chilled-water plant at 21°C. The outside ambient air conditions are 19°C dry bulb, 50% relative humidity. Using the psychrometric chart, what is the approach temperature of the cooling tower outlet water temperature to the ambient air wet-bulb temperature?
SELECT THE CORRECT ANSWER

A) 6°C
B) 4°C
C) 10°C
D) 8°C

3. What does a manometer measure?

A) Voltage
B) Pressure
C) Volume
D) Distance

4. Which of the following steam turbines will likely not provide steam output at a useable temperature for industrial processes?

A) Answers A and B
B) Extraction turbine
C) Back-pressure turbine
D) Condensing turbine

5. 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 3.8%
B) Increase energy use by 7.6%
C) No measureable change in energy use
D) Decrease energy use by 7.6%
E) Increase energy use by 3.8%

Solutions: