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AEE Certified Energy Manager (CEM) Sample Questions:

1. A refrigerant-to-water heat exchanger can be added to air-conditioning equipment to heat water using the waste heat in the vapor compression refrigerant cycle. Where is this type of heat exchanger located in the refrigerant loop?

A) After the condenser coil, before the thermal expansion valve
B) After the compressor, before the condenser coil
C) After the evaporator coil, before the compressor
D) After the expansion valve, before the evaporator coil

2. In general, which of the following is the least expensive and easiest way to finance an energy project?

A) Debt
B) Performance contract
C) Equity

3. 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 3.8%
B) Increase energy use by 7.6%
C) Decrease energy use by 3.8%
D) No measureable change in energy use
E) Decrease energy use by 7.6%

4. In a typical compressed air system, energy can be saved by which of the following actions?

A) Raising the air pressure
B) Reducing the capacity of the compressed air receiver tanks
C) Decreasing supply air pressure
D) Move the inlet air filter to a warmer location
E) Reducing the air distribution pipe size

5. A piece of equipment costs $250,000 to buy and install. The annual operating cost for the equipment is
$50,000 per year. The equipment will last 15 years. After 15 years, the equipment will have no net salvage value. The annual interest rate is 10%. What is the present value of the life-cycle cost to own and operate the equipment? Use end-of-year annual cash flow analysis.

A) $556,945
B) $630,300
C) $756,113
D) $250,000

Solutions: