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AEE Certified Energy Manager (CEM) Sample Questions:

1. Which of the following is a closed-loop controller?

A) Time clock schedule controller
B) Manual dimmer for a light switch
C) Thermostat for an air conditioning unit
D) Accelerator pedal in an automobile

2. 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) $1.25
B) $0.25
C) $0.38
D) $0.76
E) $1.44

3. A steam trap with a 6-mm orifice in an 0.8-MPa steam system has failed open. The steam system is pressurized8.760 hours/yr. The steam cost is $15.00 /GJ. Using thetable below, what is the annualcost of the vented steam through the failed steam trap? ignore any condensate return issues.

[The question from the previous image, which was about calculating the annual cost of heat loss through a wall, but had a discrepancy between the calculated cost and the provided answer choices]

A) $10,000/yr
B) $40,000/yr
C) $30,000/yr
D) $20,000/yr
E) $5,000/yr

4. A 3 MW rated wind-powered turbine has a rotor diameter of 113 meters. What is the efficiency of the wind turbine at rated power if it is operating in wind power calculated at 8.6 MW? Assume an air density of 1.225 kg/m³.

A) 28.4%
B) 59.3%
C) 42.7%
D) 34.9%

5. Which of the following is NOT a typical benefit of performance contracting from the building owner's perspective?

A) Net cash flow can be neutral or positive for the owner
B) The energy-service company can have a financial incentive to achieve projected savings
C) Performance contracting can provide access to external financing when the owner may not have sufficient equity for in-house financing for large projects
D) Maintenance services provided by the performance contractor can add value to the overall savings achieved
E) Performance contracting is a simple and quick process

Solutions: