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AEE Certified Energy Manager (CEM) Sample Questions:

1. Using the natural gas combustion efficiency tables in your workbook, find the combustion efficiency (based on higher-heating value) of a natural-gas-fired boiler if the excess air level is measured at 31.9% and the stack temperature rise is 187.8°C.

A) 80%
B) 78%
C) 84%
D) 82%
E) 76%

2. A 7 bar (gauge pressure) compressed air system has 5 leaks that are 3 mm in diameter and 3 leaks that are 6 mm in diameter. The compressed-air system is pressurized 8,760 hours per year. Electricity cost is $0.10
/kWh. What is the annual cost of the leaks in the compressed air system?

A) $48,480/yr
B) $56,500/yr
C) $30,910/yr
D) $18,150/yr
E) $25,220/yr

3. How can commissioning reduce the life-cycle cost to owners and operators?

A) Improve the performance of energy systems
B) Reduce the cost of change orders during construction
C) Improve the satisfaction of building occupants
D) Improve the effectiveness of operations and maintenance
E) All of the above

4. If installed without ancillary equipment, photovoltaic power cells generate what type of power?

A) Sinusoidal alternating current
B) Square-wave alternating current
C) Direct current

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

Solutions: