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AEE Certified Energy Manager (CEM) Sample Questions:

1. A motor operates with a normal and constant load. The electric current is measured to be 25% of the motor's nameplate rating. What does this mean?

A) The applied voltage is too low and should be increased to improve efficiency
B) The motor is oversized and may be downsized to increase efficiency
C) The applied voltage is too high and should be reduced to improve efficiency
D) The motor is operating at high efficiency

2. 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%

3. Using the natural gas combustion efficiency tables in your workbook, find the combustion efficiency (based on higher-heating value) of a natural-gas-fired boiler if the excess air level is measured at 31.9% and the stack temperature rise is 187.8°C.

A) 84%
B) 78%
C) 82%
D) 76%
E) 80%

4. Infiltration (inward air leakage) in a building is dependent on several factors. Which of the following is least likely to affect or influence infiltration in a building?

A) Outside air wind speed
B) Fuel type used for heating and cooling
C) Poor or missing weatherstripping
D) Outside air temperature
E) Building height

5. If the temperature difference across an external wall is 20°C and the heat flow across the wall is 2.5 Watts/m², calculate the insulation value of the wall (including inside and outside air films)?

A) R = 12 m²-°C/W
B) R = 6 m²-°C/W
C) R = 4 m²-°C/W
D) R = 10 m²-°C/W
E) R = 8 m²-°C/W

Solutions: