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| Section | Objectives |
|---|---|
| Topic 1: Measurement and Verification | - Energy savings calculation methods - M&V principles and protocols |
| Topic 2: Lighting Systems | - Lighting efficiency improvement strategies - Lighting technologies and controls |
| Topic 3: Energy Accounting and Economics | - Energy cost analysis and tariff structures - Energy budgeting and benchmarking - Life-cycle cost analysis and financial evaluation |
| Topic 4: Renewable Energy and Sustainability | - Sustainable energy management practices - Renewable energy integration |
| Topic 5: Energy Audits and Management | - Data collection and analysis methods - Energy management planning - Energy audit levels and procedures |
| Topic 6: Mechanical and Thermal Systems | - Boilers, steam systems, and thermal distribution - HVAC systems and optimization - Compressed air systems |
| Topic 7: Electrical Systems | - Electrical distribution systems - Motors and drives efficiency - Power factor correction |
>> CEM Exam Sample Questions <<
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NEW QUESTION # 55
What is the Energy Use index (EUl) for a 4,000 m2 building that uses the following amounts of energy each year?
Answer: D
Explanation:
NEW QUESTION # 56
Why do electric utility companies transmit power at high voltages?
SELECT THE CORRECT ANSWER
Answer: C
Explanation:
Electric utility companies transmit power at high voltages primarily to reduce transmission power losses, which are proportional to the square of the current (I²) multiplied by the resistance (R) of the transmission lines. This relationship is expressed by the formula for power loss: P_loss = I²R.
Key Points:
* Power Loss and Current Relationship:Power losses in transmission lines are directly proportional to the square of the current flowing through them. Reducing the current decreases these losses significantly.
* High Voltage Transmission:By increasing the transmission voltage, the current required to deliver the same amount of power decreases. This is because power (P) is the product of voltage (V) and current (I): P = VI. For a given power level, increasing voltage allows for a corresponding decrease in current.
* Reduced I²R Losses:Lower current results in reduced I²R losses, enhancing the efficiency of power transmission over long distances.
Conclusion:
Transmitting power at high voltages minimizes transmission losses, making it the most efficient method for long-distance electrical power delivery. Therefore, the correct answer is C. Transmission power losses (I²R) are less.
NEW QUESTION # 57
Which of the following best describes a thermally-light building?
Answer: A
NEW QUESTION # 58
When should commissioning be included in the design and construction of a facility?
Answer: B
Explanation:
1) CEM Definition and Timing of Commissioning
The AEE Certified Energy Manager (CEM) Body of Knowledge aligns with ASHRAE Guideline 0 and states that commissioning is most effective when it begins at the earliest project phase. This includes:
* Development of the Owner's Project Requirements (OPR)
* Early design reviews
* Establishing performance and energy goals
Early inclusion avoids design errors, reduces rework, and ensures energy systems are optimized from the outset.
2) Evaluation of Options
* A. When the planning process begins #
* Correct per CEM: commissioning is a process, not an event.
* B. When the design is finalized #
* Too late to influence major design decisions.
* C. When installation begins #
* Misses design-phase benefits.
* D. When construction is finalized #
* Limits commissioning to startup only.
* E. When the occupancy permit is accepted #
* Post-occupancy is too late for effective commissioning.
NEW QUESTION # 59
A facility replaces a natural gas heating system rated at 10,000 kJ/h and 80% efficiency with an electric heat pump rated at 10,000 kJ/h and a coefficient of performance (COP) of 2.3. Will this project also reduce the annual energy utilization index (EUI) for the facility?
Answer: A
Explanation:
The Energy Utilization Index (EUI) is measured as total energy consumption per unit area.
Step 1: Compare Energy Inputs for Both Systems
* Existing Natural Gas System:
* Heating output: 10,000 kJ/h
* Efficiency: 80%
* Required input energy
NEW QUESTION # 60
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