[Jul 08, 2025] Latest Energy Management CEM Actual Free Exam Questions
Energy Management CEM Dumps Updated Practice Test and 132 unique questions
NEW QUESTION # 79
Which of the following best describes a thermally-light building?
- A. An underground storage facility
- B. A building filled with manufacturing and process equipment
- C. A single-story office building where the load on the heating and cooling system is proportional to the outside air (ambient) temperature
- D. A computer data center housing multiple internet server racks
Answer: C
NEW QUESTION # 80
An outdoor parking area has 25 light poles. Each pole has a 420 Watt (ballast included) high-pressure sodium (HPS) luminaire. The parking area lights are illuminated 4,500 hours per year and the electricity cost is $0.08
/kWh. What is the annual energy cost reduction if each luminaire is replaced with a 220-Watt (driver included) LED luminaire?
- A. $2,200/yr
- B. $1,800/yr
- C. $2,600/yr
- D. $1,500/yr
- E. $1,200/yr
Answer: B
Explanation:
To determine the annual energy cost savings from switching to LED luminaires:
A table with numbers and symbols AI-generated content may be incorrect.
NEW QUESTION # 81
If the temperature difference across an external wall is 20°C and the heat flow across the wall is 2.5 Watts/m², calculate the insulation value of the wall (including inside and outside air films)?
- A. R = 10 m²-°C/W
- B. R = 8 m²-°C/W
- C. R = 6 m²-°C/W
- D. R = 12 m²-°C/W
- E. R = 4 m²-°C/W
Answer: B
NEW QUESTION # 82
A compressed air system has a total volume of 247,500 liters. During a 30-minute break in production (air compressor system turned off and no production demand for compressed air), the system pressure drops from
7 bar, gauge (700 kPa, gauge) to 5 bar, gauge (500 kPa, gauge). Calculate the leakage rate in the compressed air system.
- A. 22,750 liters/minute
- B. 8,250 liters/minute
- C. 16,500 liters/minute
- D. 48,250 liters/minute
- E. 32,000 liters/minute
Answer: C
NEW QUESTION # 83
Which of the following is NOT a renewable-energy resource?
SELECT THE CORRECT ANSWER
- A. Geothermal heat
- B. Saw grass
- C. Shale gas
- D. Ocean waves
- E. Crop residue
Answer: C
Explanation:
Renewable energy resources are naturally replenished on a human timescale. Let's evaluate each option:
A:Saw grass:A biomass resource, renewable through regrowth.
B:Shale gas:A fossil fuel extracted from shale formations, non-renewable.
C:Geothermal heat:Energy from Earth's internal heat, renewable.
D:Ocean waves:Mechanical energy from ocean surface waves, renewable.
E:Crop residue:Organic materials from agriculture, renewable.
Conclusion:
Shale gas is not a renewable energy resource. Therefore, the correct answer is B.
NEW QUESTION # 84
Which of the following controls can optimize the operation of lighting systems?
- A. Timer
- B. Occupancy sensors
- C. Photocells
- D. All of the above
- E. Dimming ballasts
Answer: D
NEW QUESTION # 85
A facility owner is considering installing a new chiller. The installed project cost will be $300,000. The annual savings from the energy-saving project will be $45,000 for the 20-year life of the chiller. If an energy- service company requires a minimum 20% return on investment (pre-tax), will the energy-service company agree to finance this project?
- A. No
- B. Yes
Answer: A
NEW QUESTION # 86
At the end of a performance contract, who owns the equipment installed by the project?
- A. The energy service company
- B. The bank
- C. The equipment manufacturer
- D. The company that paid the contract payments
Answer: D
NEW QUESTION # 87
In general, which of the following is the least expensive and easiest way to finance an energy project?
- A. Equity
- B. Performance contract
- C. Debt
Answer: C
NEW QUESTION # 88
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. $15/GJ
- B. $21 /GJ
- C. $25 /GJ
- D. $33 /GJ
Answer: B
Explanation:
To determine the equivalent price of natural gas per gigajoule (GJ) for a natural gas water heater, we compare the cost of electricity and natural gas on an energy-equivalent basis.
Step 1: Convert Electricity Cost to Cost per GJ
* Electricity cost:$0.10/kWh
* 1 GJ =277.8 kWh
A table with numbers and equations AI-generated content may be incorrect.
NEW QUESTION # 89
What type of heat transfer is reduced by adding insulation to the inside surface of a wall?
- A. Conduction
- B. Radiation
- C. Convection
Answer: A
NEW QUESTION # 90
Which motor parameter is the most difficult to measure with precision?
- A. Output power capacity
- B. Alternating current (AC) frequency
- C. Operating load factor
- D. Input power
- E. Operating (rotating) speed
Answer: C
NEW QUESTION # 91
Which of the following instruments is most useful for tracking long-term boiler performance?
- A. The pressure gauge
- B. The feedwater temperature sensor
- C. The boiler room ambient temperature sensor
- D. The drum water level gauge
- E. The exhaust stack temperature sensor
Answer: E
NEW QUESTION # 92
You can buy air compressor A for $15,000 or air compressor B for $6,000. Compressor A will cost $10,000 per year to operate. Compressor B will cost $11,500 per year to operate. If both air compressors have a 10- year life and your required return on investment is 12%, which air compressor has the lowest total life-cycle cost?
- A. Both air compressors have the same life-cycle cost
- B. Compressor A
- C. Compressor B
Answer: C
NEW QUESTION # 93
An energy project implemented today saves $10,000 per year for the next 20 years. Using the 5% interest table, determine the total value of savings at the end of the 20th year?
- A. $200,000
- B. $146,907
- C. $124,620
- D. $330,660
- E. $496,991
Answer: E
NEW QUESTION # 94
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