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AEE Certified Energy Manager (CEM) Sample Questions:

1. A high-pressure steam system passes 180°C condensate (saturated liquid) through a steam trap to an atmospherically vented condensate receiver tank. If the steam trap is working properly, how much of the condensate mass can be lost out the vent of the receiver tank in the form of flash steam?

A) 100%
B) 66%
C) 25%
D) 15%
E) 6%

2. Thermal scans of electrical equipment are useful for:

A) Locating areas of high power factor
B) Locating a loose electrical connection
C) Reading current carrying capacity of installed conductors
D) Measuring the load on a refrigerant system

3. Which type of single-phase alternating-current motor has the highest efficiency?

A) Permanent split-capacitor motor
B) Shaded-pole motor
C) Electronic-commutated motor

4. 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) 82%
B) 84%
C) 76%
D) 80%
E) 78%

5. An outdoor parking area has 25 light poles. Each pole has a 420 Watt (ballast included) high-pressure sodium (HPS) luminaire. The parking area lights are illuminated 4,500 hours per year and the electricity cost is $0.08
/kWh. What is the annual energy cost reduction if each luminaire is replaced with a 220-Watt (driver included) LED luminaire?

A) $1,800/yr
B) $2,600/yr
C) $1,200/yr
D) $2,200/yr
E) $1,500/yr

Solutions: