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AEE Certified Energy Manager (CEM) Sample Questions:

1. If a boiler cycles on and off too frequently, what control can you adjust to reduce the number of times a boiler cycles on and off?

A) Reduce the controller differential
B) Increase the controller differential
C) Increase the controller set point

2. What is the purpose of top (or skimming) blowdown in a steam boiler?

A) To dilute the level of impurities in the boiler water thus allowing the addition of cleaner make up water
B) To reduce the buildup of feedwater chemicals in the boiler
C) To flush out the boiler room drain system
D) To reduce the buildup of sediment in the boiler

3. In a chilled water thermal energy storage system, chilled water is stored at 4°C and used for supply water.
Chilled water return is 14°C. Calculate the storage capacity required to hold 50 GJ of thermal cooling. (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 2,618 m³
B) 4,180 m³
C) 1,191 m³
D) 1,356 m³
E) 766 m³

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

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

5. What is a common method to reduce the impact of voltage imbalance?

A) Reverse phase connections on three-phase motors
B) Rebalance single-phase loads
C) Install harmonic filters
D) Install capacitors to improve power factor on three-phase loads

Solutions: