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AEE Certified Energy Manager (CEM) Sample Questions:

1. How does an enthalpy-based economizer control operate?

A) Measuring the outdoor air dry-bulb temperature and relative humidity
B) Using the dry-bulb temperature and relative humidity of both the outdoor-air and return-air
C) Comparing the difference in dry-bulb air temperature measurements of the return air and the outdoor air
D) Using a constant mixed air proportion control sequence

2. A hot-water boiler has a cut-in set point of 65°C on the hot water supply temperature and a differential set point of 10°C. What is the hot-water supply temperature that causes the boiler to turn off?

A) 55°C
B) 65°C
C) It depends on the return water temperature
D) 75°C

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

4. Problems Caused by Harmonic Distortion
Which of the following problems is unlikely to be caused by harmonic distortion?
SELECT THE CORRECT ANSWER

A) Torque pulsation in motors
B) "Nuisance" tripping of circuit breakers
C) Degraded power factor C. Lighting "flicker"
D) Circulating currents in motor shafts

5. Which electric rate tariff would best cost justify a thermal energy storage (TES) system?

A) High electricity rate and low peak-demand rate
B) Low electricity rate and low peak-demand rate
C) Great differential between high season and low season electricity rates
D) Great differential between off-peak and on-peak time-of-use electricity rates
E) Great differential between high season and low season demand rates

Solutions: