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AEE Certified Energy Manager (CEM) Sample Questions:

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

2. In an ammonia-water absorption chiller, what material is the refrigerant?

A) Ammonia
B) Lithium bromide
C) Water
D) Some form of fluorocarbon

3. 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) 1.2%
C) 5.8%
D) 7.1%
E) 3.1%

4. In a PID control system, what is the purpose of the Proportional Gain?

A) Reduces/eliminates offset
B) Reacts to change
C) Senses high load rate
D) Control point

5. Which of the following statements best describe Demand Control Ventilation (DVC) in Building Automation Systems?

A) It's a prescriptive procedure in which outdoor air intake rates are calculated based on the energy cost method that compares a proposed building design to a base annual energy cost design
B) It satisfies indoor ventilation rates by preconditioning outdoor air with the exhaust air to decrease energy cost during cold, warm, or humid weather
C) It's an active evaluation of outdoor and indoor space conditions to determine the amount of thermal, mechanical and natural conditioning that is required
D) It's a building standard for enclosed spaces in which biological, chemical, and physical contaminants are considered to meet thermal comfort requirements

Solutions: