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AEE Certified Energy Manager (CEM) Sample Questions (Q55-Q60):

NEW QUESTION # 55
What is the Energy Use index (EUl) for a 4,000 m2 building that uses the following amountsof energy each year?

• A. 3,220,800 kg/m²-yr
• B. 855,250 kJ/m²-yr
• C. 403,311 kJ/m²-yr
• D. 1,612,000 kJ/m²-yr
• E. 625,600 kJ/m²-yr

Answer: E

Explanation:
A screenshot of a math problem AI-generated content may be incorrect.

 

NEW QUESTION # 56
How much fuel is required to heat 50 kg water from 20°C water to 200°C saturated steam? Assume the boiler is 80% efficient (based on the higher-heating value of the fuel).

• A. 169.3 MJ
• B. 511.2 MJ
• C. 210.5 MJ
• D. 127.2 MJ

Answer: A

 

NEW QUESTION # 57
An air-conditioning unit delivers 10,000 kJ/h (thermal cooling). The equipment uses single-phase electrical power at 220-volt and 5.25 amps with a power factor of 100%. Calculate the coefficient of performance (COP).

• A. 16.1
• B. 13.2
• C. 2.4
• D. 6.2
• E. 3.2

Answer: E

Explanation:
A screenshot of a computer AI-generated content may be incorrect.

 

NEW QUESTION # 58
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. Higher voltages are safer
• D. Electrical frequency is 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 # 59
Which of the following instruments is most useful for tracking long-term boiler performance?

• A. The boiler room ambient temperature sensor
• B. The exhaust stack temperature sensor
• C. The drum water level gauge
• D. The pressure gauge
• E. The feedwater temperature sensor

Answer: B

 

NEW QUESTION # 60
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Crystallizing the Software Development Process: A Chat with Alistair Cockburn, CEM The underlying philosophy of Zapf's design is to capture the flavor of mathematics as it might be written by a mathematician with excellent handwriting.

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