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AEE Certified Energy Manager (CEM) Sample Questions:

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

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

2. What is the main cause of low power factor?

A) Computers and electronic equipment
B) Low-load induction motors
C) Harmonics
D) Fluorescent lighting
E) Solar flares

3. 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) $187/month
C) $0/month
D) $1,875/month
E) $3,370/month

4. An air conditioning unit cools make-up air from 25°C (dry bulb temperature) and 50% relative humidity down to 13°C. What type of heat has been removed from the air?

A) No heat energy has been removed
B) Latent heat
C) Both sensible and latent heat
D) Sensible heat

5. Which of the following controls can optimize the operation of lighting systems?

A) Timer
B) All of the above
C) Occupancy sensors
D) Dimming ballasts
E) Photocells

Solutions: