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AEE Certified Energy Manager (CEM) Sample Questions:

1. What is the definition of lamp life for a fluorescent lamp?

A) The time at which 70% of a large sample of lamps have failed
B) The time at which lumen output has reduced by 50%
C) The time at which lumen output has reduced to 70% of the initial light output
D) The time at which 50% of a large sample of lamps have failed
E) The time at which lamps begin to fail

2. A 3 MW rated wind-powered turbine has a rotor diameter of 113 meters. What is the efficiency of the wind turbine at rated power if it is operating in wind power calculated at 8.6 MW? Assume an air density of 1.225 kg/m³.

A) 59.3%
B) 34.9%
C) 42.7%
D) 28.4%

3. 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) This cycle is not a combined heat and power system
C) Combined cycle
D) Topping cycle

4. 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 7:00p.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.

[Question from the previous image, which was about storage capacity for load shifting, but the table was missing]

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

5. 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) $187/month
B) $3,370/month
C) $0/month
D) $1,875/month
E) $2,244/month

Solutions: