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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 but with no financial compensation for the energy fed into the utility's transmission system
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, the value of which can offset the value of energy consumed by the customer over the net metering period

2. An energy-saving project saves $30,000 per year. The project life is 10 years and the company minimum annual rate of return (MARR) is 15%. How much can the project cost and still be cost effective?

A) $150,570
B) $188,343
C) $198,992
D) $201,123
E) $165,903

3. A high-pressure steam system passes 180°C condensate (saturated liquid) through a steam trap to an atmospherically vented condensate receiver tank. If the steam trap is working properly, how much of the condensate mass can be lost out the vent of the receiver tank in the form of flash steam?

A) 15%
B) 66%
C) 25%
D) 6%
E) 100%

4. In a chilled water thermal energy storage system, chilled water is stored at 4°C and used for supply water.
Chilled water return is 14°C. Calculate the storage capacity required to hold 50 GJ of thermal cooling. (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 2,618 m³
B) 1,191 m³
C) 1,356 m³
D) 4,180 m³
E) 766 m³

5. A hot-water boiler has a cut-in set point of 65°C on the hot water supply temperature and a differential set point of 10°C. What is the hot-water supply temperature that causes the boiler to turn off?

A) 55°C
B) 65°C
C) It depends on the return water temperature
D) 75°C

Solutions: