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AEE Certified Energy Manager (CEM) Sample Questions:

1. Why do electric utility companies transmit power at high voltages?
SELECT THE CORRECT ANSWER

A) Higher voltages are safer
B) Electrical frequency is more stable
C) Transmission power losses (12R) are less
D) Higher voltages are more stable

2. The primary advantage of predictive maintenance over preventive maintenance in building energy systems, is that predictive maintenance:
SELECT THE CORRECT ANSWER

A) Eliminates the need for regular inspections, reducing operational costs (Note: This option is selected in the image)
B) Uses real-time data and analytics to identify potential failures before they occur, minimizing unexpected outages
C) Focuses exclusively on energy savings by optimizing system set points
D) Schedules routine checks at fixed intervals to reduce downtime

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

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

4. A motor operates with a normal and constant load. The electric current is measured to be 25% of the motor's nameplate rating. What does this mean?

A) The motor is oversized and may be downsized to increase efficiency
B) The motor is operating at high efficiency
C) The applied voltage is too high and should be reduced to improve efficiency
D) The applied voltage is too low and should be increased to improve efficiency

5. 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) 4,180 m³
D) 2,618 m³
E) 1,356 m³

Solutions: