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AEE Certified Energy Manager (CEM) Sample Questions:

1. Which is the best application for variable-speed drives?

A) Reciprocating air compressor
B) Centrifugal fan motor in a multi-zone air conditioning system
C) Centrifugal fan motor in a variable-air volume air-conditioning system
D) Waste-water sewer lift pump

2. A 7 bar (gauge pressure) compressed air system has 5 leaks that are 3 mm in diameter and 3 leaks that are 6 mm in diameter. The compressed-air system is pressurized 8,760 hours per year. Electricity cost is $0.10
/kWh. What is the annual cost of the leaks in the compressed air system?

A) $30,910/yr
B) $48,480/yr
C) $18,150/yr
D) $25,220/yr
E) $56,500/yr

3. A steam trap with a 6-mm orifice in an 0.8-MPa steam system has failed open. The steam system is pressurized 8.760 hours/yr. The steam cost is $15.00 /GJ. Using the table below, what is the annual cost 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) $30,000/yr
B) $10,000/yr
C) $20,000/yr
D) $5,000/yr
E) $40,000/yr

4. Electricity costs SO. 10 per kWh. if an electric water heater has an efficiency of 95*6. what is the equivalent price of natural gas per Gigajoule for a natural gas water heater? The natural gas water heater has an efficiency of 95*t based on lower-heating value.
[Natural gas has an energy content of 36.400 K|/m3 (higher-heating value) and 32-760 K/m3 (lower-heating value).] SELECT THE CORRECT ANSWER

A) $33 / GJ
B) $21 / GJ
C) $25 / GJ
D) $15/GJ

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

Solutions: