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AEE Certified Energy Manager (CEM) Sample Questions:

1. The temperature in an unconditioned mechanical room is found to typically be around 23°C warmer than ambient air. If the air intake of an air compressor located in the mechanical room is routed through a nearby wall so that ambient air is fed directly to the air compressor's intake, what impact can be expected on the air compressor's energy requirement?

A) Increase energy use by 7.6%
B) Decrease energy use by 7.6%
C) No measureable change in energy use
D) Increase energy use by 3.8%
E) Decrease energy use by 3.8%

2. A 25-kW motor, at full load, drives a centrifugal fan that produces 160,000 liters per second (l/s) of ventilation air. If the fan speed is reduced to a flow rate of 150,000 l/s, what is the new load on the motor?

A) 25.0 kW
B) 30.3 kW
C) 15.2 kW
D) 24.2 kW
E) 20.6 kW

3. If the initial design process includes group relamping, how can this reduce the number of lamps required to illuminate a space?

A) Group relamping requires using larger Wattage lamps, which means fewer lamps are required to illuminate a space
B) Group relamping reduces factors that contribute to light loss, which means fewer lamps are required to illuminate a space
C) Group relamping cannot reduce the number of lamps required to illuminate a space
D) Group relamping reduces the overall amount of lamp breakages, which means fewer lamps are required to illuminate a space.
E) Group relamping improves the room cavity ratio, which means fewer lamps are required to illuminate a space

4. 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

5. What is the main cause of low power factor?

A) Computers and electronic equipment
B) Solar flares
C) Fluorescent lighting
D) Low-load induction motors
E) Harmonics

Solutions: