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AEE Certified Energy Manager (CEM) Sample Questions:

1. A building has a 100 m² wall with an R-value of 14.4 (m²-C/W) in a climate with 3,500 heating degree days (HDD). The building heater is 85% efficient [based on the fuel's higher-heating value (HHV)]. The fuel cost is $5.00/GJ [based on the fuel's higher-heating value (HHV)]. What is the annual cost of the heat loss through the wall?

A) $22.56/yr
B) $12.35/yr
C) $16.22/yr
D) $14.44/yr
E) $10.56/yr

2. Which of the following is a closed-loop controller?

A) Accelerator pedal in an automobile
B) Manual dimmer for a light switch
C) Time clock schedule controller
D) Thermostat for an air conditioning unit

3. In a performance contract, which group has the greatest investment risk?

A) The equipment manufacturer
B) The company installing the energy project
C) Risk is shared by the terms in the performance contract
D) The energy-service company

4. 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) 1.2%
B) 5.8%
C) 9.3%
D) 7.1%
E) 3.1%

5. A cooling tower is delivering water to a chilled-water plant. The cooling tower outlet temperature has a 6°C approach temperature to the ambient air, wet-bulb temperature. The outside air conditions are 20°C dry bulb,
60% relative humidity. Using the psychrometric chart, at what temperature can the cooling tower deliver water to the chilled-water plant?

A) 25°C
B) 21°C
C) 13°C
D) 17°C

Solutions: