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AEE Certified Energy Manager (CEM) Sample Questions:

1. If a boiler cycles on and off too frequently, what control can you adjust to reduce the number of times a boiler cycles on and off?

A) Increase the controller set point
B) Reduce the controller differential
C) Increase the controller differential

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

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

4. A building has a 100 m² wall with an R-value of 14.4 (m²-C/W) in a climate with 3,500 heating degree days (HDD). The building heater is 85% efficient [based on the fuel's higher-heating value (HHV)]. The fuel cost is $5.00/GJ [based on the fuel's higher-heating value (HHV)]. What is the annual cost of the heat loss through the wall?

A) $16.22/yr
B) $10.56/yr
C) $14.44/yr
D) $22.56/yr
E) $12.35/yr

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

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

Solutions: