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AEE Certified Energy Manager (CEM) Sample Questions:

1. A 50-kW induction motor (1,500 rpm synchronous speed) has a nameplate full-load rotational speed of 1,455 rpm. Field measurements show the actual rotational speed is 1,475 rpm. Using the slip method, calculate the partial load factor of the motor.

A) 46%
B) 56%
C) 80%
D) 98%
E) 101%

2. Exhaust gases from an industrial furnace flow through a heat-recovery steam generator, which generates medium-pressure steam. This steam is used in a steam turbine to generate shaft power driving a fan. Which type of combined heat and power (CHP) cycle does this process describe?

A) Bottoming cycle
B) Combined cycle
C) Topping cycle
D) This cycle is not a combined heat and power system

3. What is the Energy Use index (EUl) for a 4,000 m2 building that uses the following amounts of energy each year?

A) 1,612,000 kJ/m²-yr
B) 3,220,800 kg/m²-yr
C) 403,311 kJ/m²-yr
D) 625,600 kJ/m²-yr
E) 855,250 kJ/m²-yr

4. An energy-saving project costs $540,000. The project will have maintenance costs of $25,000 per year. The energy savings from the project are $160,000 per year. The project has a life of 10 years with no salvage value. The minimum attractive rate of return (MARR) is 10%. Using end-of-year cash flows, calculate the net- present value (NPV) of the project.

A) $456,254
B) $311,556
C) $289,575
D) $154,657

5. An office building is illuminated with T8 fluorescent lamps. Which of the following is the best schedule for group relamping (total replacement of all the T8 fluorescent lamps in the building)?

A) When 25% of the lamps have failed
B) When the building owner changes
C) When 20% of the ballasts have failed
D) When you reach 70% of the rated lamp life
E) Every 4 years

Solutions: