CEM題庫下載：Certified Energy Manager (CEM)確定通過考試，AEE最新CEM題庫

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最新的 Energy Management CEM 免費考試真題 (Q45-Q50):

問題 #45
A high-pressure steam system passes 180°C condensate (saturated liquid) through a steam trap to an atmospherically vented condensate receiver tank. If the steam trap is working properly, how much of the condensate mass can be lost out the vent of the receiver tank in the form of flash steam?

  • A. 15%
  • B. 100%
  • C. 25%
  • D. 66%
  • E. 6%

答案：C


問題 #46
According to the institute of Electrical and Electronic Engineers (IEEE) standard 519. "Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems." the maximum total harmonic distortion (THD) for general low voltage systems less than 600 votts) should be:
SELECT THE CORRECT ANSWER

  • A. Less than 1%
  • B. Greater than 1%
  • C. Less than 20%
  • D. Less than 5%
  • E. Less than 10%

答案：D

解題說明：
The Institute of Electrical and Electronics Engineers (IEEE) Standard 519, titled "Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems," sets forth guidelines to maintain the quality of electrical power by limiting harmonic distortions. According to IEEE 519, for general low-voltage systems (defined as systems with a voltage less than 600 volts), the Total Harmonic Distortion (THD) of the voltage waveform should not exceed 5%. This threshold ensures the reliable operation of electrical equipment and minimizes potential issues such as overheating or malfunctioning caused by excessive harmonics.
Therefore, the correct answer is C. Less than 5%.


問題 #47
A 3 MW rated wind-powered turbine has a rotor diameter of 113 meters. What is the efficiency of the wind turbine at rated power if it is operating in wind power calculated at 8.6 MW? Assume an air density of 1.225 kg/m³.

  • A. 34.9%
  • B. 28.4%
  • C. 59.3%
  • D. 42.7%

答案：A


問題 #48
Why do electric utility companies transmit power at high voltages?
SELECT THE CORRECT ANSWER

  • A. Electrical frequency is more stable
  • B. Higher voltages are safer
  • C. Transmission power losses (12R) are less
  • D. Higher voltages are more stable

答案：C

解題說明：
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.


問題 #49
A new lighting system costs $60,000. The new lighting system has a 15-year life and the minimum required rate of return (MARR) is 15%. How much must the new lighting system save to be life-cycle cost effective?

  • A. $10,260/year
  • B. $27,090/year
  • C. $15,650/year
  • D. $12,556/year
  • E. $33,200/year

答案：D


問題 #50
......

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