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Certified Energy Manager (CEM) practice torrent & CEM study guide & Certified Energy Manager (CEM) dumps vce

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AEE Certified Energy Manager (CEM) Sample Questions (Q91-Q96):

NEW QUESTION # 91
Calculate the monthly electric bill for a customer that used 400 kW and 75,000 kwh during one month. Use the following declining block structure for a monthly bill:

SELECT THE CORRECT ANSWER

A. $9,660
B. $3,280
C. $12,500
D. $4, 580
E. $7,850

Answer: A

Explanation:
We need to calculate the monthly electric bill based on the given pricing structure.
Step 1: Identify Charges from the Table
* Customer charge:$50/month
* Peak demand charge:$10/kW-month
* Electric consumption charges:
* First25,000 kWh@$0.06/kWh
* Excess(75,000 - 25,000) = 50,000 kWh@$0.05/kWh
* Tax:20% of total
A screenshot of a calculator AI-generated content may be incorrect.

NEW QUESTION # 92
Why do electric utility companies transmit power at high voltages?
SELECT THE CORRECT ANSWER

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

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 # 93
What is the purpose of monitoring energy consumption?
SELECT THE CORRECT ANSWER

A. To establish a basis of management control
B. To establish when and why there is a deviation in energy consumption patterns
C. All of the above
D. To support analysis of energy information

Answer: C

Explanation:
Monitoring energy consumption is a critical component of effective energy management. It serves multiple purposes that collectively enhance an organization's ability to control energy use, identify inefficiencies, and implement improvements. These purposes include:
* Establishing a Basis of Management Control:By systematically tracking energy consumption, organizations create a foundation for managing energy use effectively. This data enables the setting of benchmarks and performance indicators, facilitating informed decision-making and strategic planning.
* Identifying Deviations in Energy Consumption Patterns:Continuous monitoring allows for the detection of anomalies or unexpected changes in energy usage. Recognizing when and why these deviations occur is essential for diagnosing potential issues, such as equipment malfunctions or operational inefficiencies, and addressing them promptly.
* Supporting Analysis of Energy Information:Comprehensive energy data collection supports detailed analysis, aiding in understanding consumption trends, evaluating the impact of energy conservation measures, and identifying opportunities for further efficiency improvements.
Given that monitoring energy consumption fulfills all the above functions, the correct answer is D. All of the above.

NEW QUESTION # 94
Which motor parameter is the most difficult to determine accurately?
SELECT THE CORRECT ANSWER

A. Operating load factor using slip calculations
B. Output power capacity
C. Input power
D. Operating (rotating) speed

Answer: A

NEW QUESTION # 95
A facility has the thermal cooling load profile shown in the table below. The utility rate traffic has an no-peak time-of-use period that begins at 10:00 a.m ends at 7:00 p.m. What chiller capacity (output) is required for a load-leveling operating strategy?

[Question from the previous image, which was about chiller capacity for load leveling, but the table was missing]

A. 5.0 GJ/h
B. 8.0 GJ/h
C. 4.0 GJ/h
D. 7.0 GJ/h

Answer: B

NEW QUESTION # 96
......

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