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AEE Certified Energy Manager (CEM) Sample Questions:

1. When should commissioning be included in the design and construction of a facility?

A) When the design is finalized
B) When construction is finalized
C) When the occupancy permit is accepted
D) When installation of the energy systems begins
E) When the planning process begins

2. A controlled valve is full closed when it gets a signal of 4 mA. The valve is full open when it gets a signal of
20 mA. With a control signal of 8 mA, what is the valve position?

A) 12.5% open
B) 75% open
C) 45% open
D) 82% open
E) 25% open

3. A gas-fired boiler is operating with 31.9% excess air. A feedwater economizer is used to reduce the stack temperature rise from 310°C to 160°C. Using the natural gas combustion efficiency tables in your workbook, find the energy savings from the economizer as a percentage of historical fuel consumption.

A) 3.1%
B) 7.1%
C) 5.8%
D) 1.2%
E) 9.3%

4. Natural gas costs $4.80/GJ. How much does it cost to heat 500 liters of water from 18°C to 50°C using a natural gas water heater with an efficiency of 85%? [The efficiency and fuel price are both based on HHV.
The specific heat of water (C) is 4.2 kJ/kg-°C.]

A) $1.44
B) $0.38
C) $1.25
D) $0.76
E) $0.25

5. An air conditioning unit cools make-up air from 25°C (dry bulb temperature) and 50% relative humidity down to 13°C. What type of heat has been removed from the air?

A) Both sensible and latent heat
B) No heat energy has been removed
C) Sensible heat
D) Latent heat

Solutions: