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AEE Certified Energy Manager (CEM) Sample Questions (Q139-Q144):

NEW QUESTION # 139
Using a degree-day base of 18°C, calculate the number of cooling degree days (CDD) if the outside temperature is a uniform 25°C throughout the year (365 days/year).

Answer: A


NEW QUESTION # 140
A concentrating solar thermal system collects 5 GJ/h of thermal heat, which is delivered to a 94% efficient hot water generator. The hot water generator is used to raise the water temperature from 15°C to 65°C. The specific heat of water (Cp) is 4.2 kJ/kg-°C. What flow rate (liter/second) of hot water can be delivered from the hot water generator?

Answer: C

Explanation:
Step 1: Compute Useful Thermal Energy Output
Given:
* Solar system delivers 5 GJ/h
* Hot water generator efficiency = 94%


NEW QUESTION # 141
Which of the following controls can optimize the operation of lighting systems?

Answer: C


NEW QUESTION # 142
A three phase, 380.volt system has the following voltage measurements:
Va = 375$ volts
Vb = 380$ volts
Vc = 391$ volts
Calculate the percent voltage imbalance.
SELECT THE CORRECT ANSWER

Answer: E


NEW QUESTION # 143
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

Answer: B

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 # 144
......

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