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AEE Certified Energy Manager (CEM) Sample Questions:

1. If a boiler cycles on and off too frequently, what control can you adjust to reduce the number of times a boiler cycles on and off?

A) Increase the controller set point
B) Reduce the controller differential
C) Increase the controller differential

2. A 1OO-kW packaged engine-generate combined heat and power (CHP) system has the specifications listed below. The CHP equipment operates fully loaded for 8.000 h/yr. What isthe annual fuel cost for the ChP equipment?
CMP equipment specifications: Electrical output 100kw Electrical efficiency: 25% Thermal recovery efficiency: 50*6 Total CMP efficiency: 75% Additional information: Fuel cost: S3.S0/GJ Electricity cost S0.06/kWh Previous water heating efficiency:
8046 Mot water usage: 75,700 liters/day (21 *C temperature rise)
[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) $32,668/yr
B) $28,900/yr
C) $52,222/yr
D) $58,300/yr
E) $43,776/yr

3. 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) 42.7%
B) 34.9%
C) 59.3%
D) 28.4%

4. What is a common method to reduce the impact of voltage imbalance?

A) Rebalance single-phase loads
B) Reverse phase connections on three-phase motors
C) Install capacitors to improve power factor on three-phase loads
D) Install harmonic filters

5. Which type of single-phase alternating-current motor has the highest efficiency?

A) Permanent split-capacitor motor
B) Electronic-commutated motor
C) Shaded-pole motor

Solutions: