RELIABLE CEM TEST BRAINDUMPS & CEM TEST PASSING SCORE

Reliable CEM Test Braindumps & CEM Test Passing Score

Reliable CEM Test Braindumps & CEM Test Passing Score

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Tags: Reliable CEM Test Braindumps, CEM Test Passing Score, Key CEM Concepts, CEM Latest Test Questions, CEM Testking Exam Questions

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AEE CEM Test Passing Score & Key CEM Concepts

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AEE Certified Energy Manager (CEM) Sample Questions (Q27-Q32):

NEW QUESTION # 27
An office building is illuminated with T8 fluorescent lamps. Which of the following is the best schedule for group relamping (total replacement of all the T8 fluorescent lamps in the building)?

  • A. When 25% of the lamps have failed
  • B. Every 4 years
  • C. When the building owner changes
  • D. When you reach 70% of the rated lamp life
  • E. When 20% of the ballasts have failed

Answer: D


NEW QUESTION # 28
Why do electric utility companies transmit power at high voltages?
SELECT THE CORRECT ANSWER

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

Answer: B

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 # 29
Which is the best application for variable-speed drives?

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

Answer: C


NEW QUESTION # 30
Infiltration (inward air leakage) in a building is dependent on several factors. Which of the following is least likely to affect or influence infiltration in a building?

  • A. Fuel type used for heating and cooling
  • B. Outside air temperature
  • C. Poor or missing weatherstripping
  • D. Outside air wind speed
  • E. Building height

Answer: A


NEW QUESTION # 31
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 10%
  • B. Greater than 1%
  • C. Less than 1%
  • D. Less than 5%
  • E. Less than 20%

Answer: D

Explanation:
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%.


NEW QUESTION # 32
......

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