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AEE Certified Energy Manager (CEM) Sample Questions:

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

2. In a warehouse, lights are mounted 4 meters above the floor. This provides an average light level of 150 lux.
To increase the light level without installing more lights or higher Wattage lights, you lower the light fixtures with pendants so that the lights are located 3.25 meters above the floor. Calculate the new average light level on the floor.

A) 166 lux
B) 150 lux
C) 276 lux
D) 176 lux
E) 227 lux

3. Which motor parameter is the most difficult to measure with precision?

A) Alternating current (AC) frequency
B) Operating (rotating) speed
C) Operating load factor
D) Input power
E) Output power capacity

4. A compressed air system has a total volume of 247,500 liters. During a 30-minute break in production (air compressor system turned off and no production demand for compressed air), the system pressure drops from
7 bar, gauge (700 kPa, gauge) to 5 bar, gauge (500 kPa, gauge). Calculate the leakage rate in the compressed air system.

A) 16,500 liters/minute
B) 48,250 liters/minute
C) 8,250 liters/minute
D) 22,750 liters/minute
E) 32,000 liters/minute

5. A concentrating solar thermal system collects 5 GJ/h of thermal heat, which is delivered to a 94% efficient hot water generator. The hot water generator is used to raise the water temperature from 15°C to 65°C. The specific heat of water (Cp) is 4.2 kJ/kg-°C. What flow rate (liter/second) of hot water can be delivered from the hot water generator?

A) 12.0 liter/second
B) 4.2 liter/second
C) 9.2 liter/second
D) 6.2 liter/second

Solutions: