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AEE Certified Energy Manager (CEM) Sample Questions:

1. A cooling tower is delivering water to a chilled-water plant. The cooling tower outlet temperature has a 6°C approach temperature to the ambient air, wet-bulb temperature. The outside air conditions are 20°C dry bulb,
60% relative humidity. Using the psychrometric chart, at what temperature can the cooling tower deliver water to the chilled-water plant?

A) 17°C
B) 21°C
C) 13°C
D) 25°C

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

3. A large office building is entirely fitted out with ten-thousand new T5 fluorescent lamps today, which will be operational for 2,500 hours per year. The lamps are supposed to last 17,860 hours. How many months from today will be the best schedule for group relamping (total replacement of all the T5 fluorescent lamps in the building)?

A) 5 months
B) 68 months
C) 60 months
D) 85.7 months

4. What is a common cause of poor power quality?

A) Synchronous motors
B) Incandescent lighting
C) Electronic equipment, such as personal computers
D) Partially loaded induction motors
E) Natural gas turbine power generation by utilities

5. Which problems can be caused by poor power quality?

A) Answers B and C
B) Circuit breakers tripping
C) Induction motors running backwards
D) All of the above
E) Equipment overheating

Solutions: