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CEM Pdf Format - CEM Test Certification Cost

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AEE Certified Energy Manager (CEM) Sample Questions (Q32-Q37):

NEW QUESTION # 32
The set point for the chiller supply water temperature is varied as a function of the thermal demand for space cooling. What do you call this control strategy?

A. Reheat coil reset
B. Chilled-water temperature reset
C. Night setback
D. Condenser-water temperature reset

Answer: B

NEW QUESTION # 33
A new energy-efficient boiler costs $60,890 to buy and install. The new energy-efficient boiler will save
$15,400 per year and last for 20 years. What is the internal rate of return (IRR) of the project?

A. 20%
B. 25%
C. 10%
D. 15%
E. 30%

Answer: A

NEW QUESTION # 34
In a performance contract, which group has the greatest investment risk?

A. Risk is shared by the terms in the performance contract
B. The company installing the energy project
C. The equipment manufacturer
D. The energy-service company

Answer: D

NEW QUESTION # 35
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. Higher voltages are more stable
D. Transmission power losses (12R) are less

Answer: D

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 # 36
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?

A. 9.2 liter/second
B. 6.2 liter/second
C. 12.0 liter/second
D. 4.2 liter/second

Answer: A

Explanation:
Step 1: Compute Useful Thermal Energy Output
Given:
* Solar system delivers5 GJ/h
* Hot water generator efficiency= 94%
A screenshot of a math problem AI-generated content may be incorrect.

NEW QUESTION # 37
......

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