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AEE Certified Energy Manager (CEM) Sample Questions:

1. How much energy (kJ) is required to heat 2 kg of water from 25°C to 2 kg of water at 100°C? (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 420 kJ
B) 510 kJ
C) 630 kJ
D) 840 kJ

2. You can buy air compressor A for $15,000 or air compressor B for $6,000. Compressor A will cost $10,000 per year to operate. Compressor B will cost $11,500 per year to operate. If both air compressors have a 10- year life and your required return on investment is 12%, which air compressor has the lowest total life-cycle cost?

A) Compressor B
B) Both air compressors have the same life-cycle cost
C) Compressor A

3. 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) 48,250 liters/minute
B) 32,000 liters/minute
C) 8,250 liters/minute
D) 16,500 liters/minute
E) 22,750 liters/minute

4. Exhaust gases from an industrial furnace flow through a heat-recovery steam generator, which generates medium-pressure steam. This steam is used in a steam turbine to generate shaft power driving a fan. Which type of combined heat and power (CHP) cycle does this process describe?

A) Topping cycle
B) Combined cycle
C) This cycle is not a combined heat and power system
D) Bottoming cycle

5. Using the lumen method, calculate the number of luminaires (fixtures) required to light a room to 200 lux.
Each luminaire has 2 fluorescent lamps, 3,000 lumens per lamp. The room is 20 meters by 30 meters. The total light loss factor (LLF) is 0.70 and the luminaire coefficient of utilization (CU) is 0.80.

A) 12 luminaires
B) 24 luminaires
C) 36 luminaires
D) 48 luminaires
E) 60 luminaires

Solutions: