Various versions

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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 motor is operating at high efficiency
D) The applied voltage is too high and should be reduced to improve efficiency

2. 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's an active evaluation of outdoor and indoor space conditions to determine the amount of thermal, mechanical and natural conditioning that is required
C) It's a building standard for enclosed spaces in which biological, chemical, and physical contaminants are considered to meet thermal comfort requirements
D) It satisfies indoor ventilation rates by preconditioning outdoor air with the exhaust air to decrease energy cost during cold, warm, or humid weather

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

4. What is the main cause of low power factor?

A) Low-load induction motors
B) Solar flares
C) Harmonics
D) Computers and electronic equipment
E) Fluorescent lighting

5. Which of the following instruments is most useful for tracking long-term boiler performance?

A) The pressure gauge
B) The feedwater temperature sensor
C) The exhaust stack temperature sensor
D) The drum water level gauge
E) The boiler room ambient temperature sensor

Solutions: