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| Section | Objectives |
|---|---|
| Electrical Systems | - Electrical distribution systems - Power factor correction - Motors and drives efficiency |
| Mechanical and Thermal Systems | - Boilers, steam systems, and thermal distribution - HVAC systems and optimization - Compressed air systems |
| Renewable Energy and Sustainability | - Sustainable energy management practices - Renewable energy integration |
| Energy Accounting and Economics | - Energy cost analysis and tariff structures - Energy budgeting and benchmarking - Life-cycle cost analysis and financial evaluation |
| Energy Audits and Management | - Data collection and analysis methods - Energy audit levels and procedures - Energy management planning |
| Measurement and Verification | - M&V principles and protocols - Energy savings calculation methods |
| Lighting Systems | - Lighting technologies and controls - Lighting efficiency improvement strategies |
CEM guide materials really attach great importance to the interests of users. In the process of development, it also constantly considers the different needs of users. According to your situation, our CEM study materials will tailor-make different materials for you. And the content of the CEM Exam Questions is always the latest information contained for our technicals update the questions and answers in the first time.
NEW QUESTION # 78
How can you tell if steam traps in a steam distribution system may NOT be working correctly?
Answer: C
NEW QUESTION # 79
Which is the best application for variable-speed drives?
Answer: A
NEW QUESTION # 80
In an ammonia-water absorption chiller, what material is the refrigerant?
Answer: A
NEW QUESTION # 81
Why do electric utility companies transmit power at high voltages?
SELECT THE CORRECT ANSWER
Answer: A
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 # 82
A 25-kW motor, at full load, drives a centrifugal fan that produces 160,000 liters per second (l/s) of ventilation air. If the fan speed is reduced to a flow rate of 150,000 l/s, what is the new load on the motor?
Answer: A
NEW QUESTION # 83
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