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AEE Certified Energy Manager (CEM) Sample Questions:

1. A 75-kW induction motor operates at 80% partial load and 88% efficiency. A new high-efficiency 75-kW motor can be installed that will operate at 95% efficiency (also at 80% partial load). What is the reduction in electric power demand?

A) 4 kW
B) 5 kW
C) 8 kW
D) 2 kW
E) 1 kW

2. Calculate the monthly electric bill for a customer that used 400 kW and 75,000 kwh during one month. Use the following declining block structure for a monthly bill:

SELECT THE CORRECT ANSWER

A) $7,850
B) $3,280
C) $4, 580
D) $9,660
E) $12,500

3. If the initial design process includes group relamping, how can this reduce the number of lamps required to illuminate a space?

A) Group relamping cannot reduce the number of lamps required to illuminate a space
B) Group relamping improves the room cavity ratio, which means fewer lamps are required to illuminate a space
C) Group relamping requires using larger Wattage lamps, which means fewer lamps are required to illuminate a space
D) Group relamping reduces the overall amount of lamp breakages, which means fewer lamps are required to illuminate a space.
E) Group relamping reduces factors that contribute to light loss, which means fewer lamps are required to illuminate a space

4. 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) $20,000/yr
D) $30,000/yr
E) $5,000/yr

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

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

Solutions: