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AEE Certified Energy Manager (CEM) Sample Questions:

1. In a warehouse, lights are mounted 4 meters above the floor. This provides an average light level of 150 lux.
To increase the light level without installing more lights or higher Wattage lights, you lower the light fixtures with pendants so that the lights are located 3.25 meters above the floor. Calculate the new average light level on the floor.

A) 176 lux
B) 276 lux
C) 227 lux
D) 166 lux
E) 150 lux

2. 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 < 0%
B) IRR > 15%
C) IRR = 15%
D) IRR < 15%

3. A facility has the thermal cooling load profile shown in the table below. The utility rate tariff has an on-peak time-of-use billing period that begins at 10:00 a.m. and ends at 7:00 p.m. Calculate the storage capacity required for a load-shifting operating strategy, to make sure that no thermal cooling Is generated by the chiller during the on-peak utility rate period.

A) 48 GJ
B) 84 GJ
C) 66 GJ
D) 72 GJ

4. 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) 2,975 CDD/yr
B) 1,845 CDD/yr
C) 2,555 CDD/yr
D) 2,250 CDD/yr
E) 1,955 CDD/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: