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AEE Certified Energy Manager (CEM) Sample Questions:

1. Natural gas costs $4.80/GJ. How much does it cost to heat 500 liters of water from 18°C to 50°C using a natural gas water heater with an efficiency of 85%? [The efficiency and fuel price are both based on HHV.
The specific heat of water (C) is 4.2 kJ/kg-°C.]

A) $0.25
B) $0.76
C) $0.38
D) $1.44
E) $1.25

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

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

3. For general indoor residential lighting applications, which lamp would you recommend to replace an 11 watt CFL with in order to provide the most appropriate illumination with the highest efficacy?
SELECT THE CORRECT ANSWER

A) 5 watt low-pressure sodium
B) 36 watt fluorescent tube with electronic ballast
C) 7 watt light-emitting diode
D) 4 watt incandescent
E) 10 watt light-emitting diode

4. Infiltration (inward air leakage) in a building is dependent on several factors. Which of the following is least likely to affect or influence infiltration in a building?

A) Outside air temperature
B) Building height
C) Outside air wind speed
D) Poor or missing weatherstripping
E) Fuel type used for heating and cooling

5. A desk lamp is located inside a windowless office. The office is heated during the winter and cooled during the summer. When the lamp is switched on, how much of the energy consumed by the lamp becomes heat in the office space?

A) 100%
B) 80%
C) 120%
D) 25%

Solutions: