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AEE Certified Energy Manager (CEM) Sample Questions:

1. A compressed air system has a total volume of 247,500 liters. During a 30-minute break in production (air compressor system turned off and no production demand for compressed air), the system pressure drops from
7 bar, gauge (700 kPa, gauge) to 5 bar, gauge (500 kPa, gauge). Calculate the leakage rate in the compressed air system.

A) 22,750 liters/minute
B) 32,000 liters/minute
C) 16,500 liters/minute
D) 8,250 liters/minute
E) 48,250 liters/minute

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

A) It satisfies indoor ventilation rates by preconditioning outdoor air with the exhaust air to decrease energy cost during cold, warm, or humid weather
B) 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
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's an active evaluation of outdoor and indoor space conditions to determine the amount of thermal, mechanical and natural conditioning that is required

3. Electricity costs SO. 10 per kWh. if an electric water heater has an efficiency of 95*6. what is the equivalent price of natural gas per Gigajoule for a natural gas water heater? The natural gas water heater has an efficiency of 95*t based on lower-heating value.
[Natural gas has an energy content of 36.400 K|/m3 (higher-heating value) and 32-760 K/m3 (lower-heating value).] SELECT THE CORRECT ANSWER

A) $33 /GJ
B) $15/GJ
C) $21 /GJ
D) $25 /GJ

4. Calculate the monthly electric bill for a customer that used 400 kW and 75,000 kwh during one month. Use the following declining block structure for a monthly bill:

SELECT THE CORRECT ANSWER

A) $4, 580
B) $3,280
C) $12,500
D) $7,850
E) $9,660

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

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

Solutions: