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AEE Certified Energy Manager (CEM) Sample Questions:

1. Some international electric utilities use 'net metering" for customers with renewable energy equipment, such as photovoltaic power panels. Which of the following best describes net metering with regard to excess power generation and utility billing practices?
SELECT THE CORRECT ANSWER

A) Accept excess electric energy generated by a customer's energy system, the value of which can offset the value of energy consumed by the customer over the net metering period
B) Transmit electric energy generated by a customer's energy system so that the customer may sell the excess electricity to another company on the transmission system
C) Accept excess electric energy generated by a customer's energy system but with no financial compensation for the energy fed into the utility's transmission system

2. An air-conditioning system at full load is rated at 70-kW (thermal cooling) and has a coefficient of performance (COP) of 4.1. What is the electrical load at full load?

A) 70.0 kW
B) 23.3 kW
C) 46.7 kW
D) 35.0 kW
E) 17.1 kW

3. What is the best type of heat exchanger to recover and transfer latent heat energy from one air stream to another?

A) Heat pipe
B) Ceramic recuperator
C) Desiccant heat wheel
D) Shell and tube
E) Run-around system

4. A facility has the thermal cooling load profile shown in the table below. The utility rate traffic has an no-peak time-of-use period that begins at 10:00 a.m ends at 7:00 p.m. What chiller capacity (output) is required for a load-leveling operating strategy?

[Question from the previous image, which was about chiller capacity for load leveling, but the table was missing]

A) 4.0 GJ/h
B) 7.0 GJ/h
C) 5.0 GJ/h
D) 8.0 GJ/h

5. 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) 16,500 liters/minute
B) 48,250 liters/minute
C) 22,750 liters/minute
D) 32,000 liters/minute
E) 8,250 liters/minute

Solutions: