AEE CEM : Certified Energy Manager (CEM)

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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) 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
B) 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
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. Lighting systems operate with a certain recoverable light loss factor. Control systems with photocell sensor inputs combined with dimming ballasts can be used to regulate dimming levels to maintain a continuous light level in the work space. Which of the following best describes this type of control?

A) Open-loop controller
B) Closed-loop controller
C) Two-position controller
D) Demand-limiting controller

3. Using a degree-day base of 18°C, calculate the number of cooling degree days (CDD) if the outside temperature is a uniform 25°C throughout the year (365 days/year).

A) 2,555 CDD/yr
B) 2,250 CDD/yr
C) 1,955 CDD/yr
D) 1,845 CDD/yr
E) 2,975 CDD/yr

4. A 100-kW electrical load has a power factor of 75%. What capacitance, in KVAR, will improve the power factor to 95%?

A) 55.3 kVAR
B) 45.2 kVAR
C) 25.3 kVAR
D) 15.7 kVAR
E) 33.1 kVAR

5. An outdoor parking area has 25 light poles. Each pole has a 420 Watt (ballast included) high-pressure sodium (HPS) luminaire. The parking area lights are illuminated 4,500 hours per year and the electricity cost is $0.08
/kWh. What is the annual energy cost reduction if each luminaire is replaced with a 220-Watt (driver included) LED luminaire?

A) $1,200/yr
B) $1,800/yr
C) $1,500/yr
D) $2,600/yr
E) $2,200/yr

Solutions: