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AEE Certified Energy Manager (CEM) Sample Questions:

1. A facility has a monthly peak power demand of 1,000 kW and an average power factor of 80%. The facility pays a demand charge of $7.50/kVA-month. What is the additional cost per month because the power factor is less than 100%?

A) $2,244/month
B) $3,370/month
C) $187/month
D) $0/month
E) $1,875/month

2. A 25-kW motor, at full load, drives a centrifugal fan that produces 160,000 liters per second (l/s) of ventilation air. If the fan speed is reduced to a flow rate of 150,000 l/s, what is the new load on the motor?

A) 20.6 kW
B) 30.3 kW
C) 25.0 kW
D) 24.2 kW
E) 15.2 kW

3. A 100-kW packaged engine-generator combined heat and power (CHP) system has the specifications listed below. What is the annual purchased fuel cost for the CHP system, assuming that the CHP is electrical output limited and operates at full electrical load all year?

SELECT THE CORRECT ANSWER

A) $28,900/yr
B) $32,668/yr
C) $43,776/yr
D) $58,300/yr
E) $52,222/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) $10.56/yr
B) $22.56/yr
C) $12.35/yr
D) $14.44/yr
E) $16.22/yr

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

Solutions: