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AEE Certified Energy Manager (CEM) Sample Questions:

1. Which pump system listed below is most likely the best application for converting to variable-speed drive?

A) Pump system with bypass control transferring liquid from an intake dam to a process in production
B) Pump system with parallel rotary lobe pumps in a rebar quenching application with a static head of 80m
C) Pump system with throttle fully open circulating liquid in a closed loop cooling system
D) Pump system with on-off control transferring liquid vertically from a low tank to a higher tank

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

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

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

4. Using an interest rate of 15%, an energy project has a net-present value (NPV) of $3,500. Which statement is true about the project's internal rate of return (IRR)?

A) IRR = 15%
B) IRR < 15%
C) IRR < 0%
D) IRR > 15%

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

Solutions: