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AEE Certified Energy Manager (CEM) Sample Questions (Q56-Q61):

NEW QUESTION # 56
A piece of equipment costs $250,000 to buy and install. The annual operating cost for the equipment is
$50,000 per year. The equipment will last 15 years. After 15 years, the equipment will have no net salvage value. The annual interest rate is 10%. What is the present value of the life-cycle cost to own and operate the equipment? Use end-of-year annual cash flow analysis.

A. $556,945
B. $756,113
C. $250,000
D. $630,300

Answer: A

NEW QUESTION # 57
For general indoor residential lighting applications, which light source can provide the most appropriate illumination with the highest efficacy?

A. Incandescent
B. Mercury vapor (MV)
C. Light-emitting diode (LED)
D. Compact fluorescent (CFL)
E. Low-pressure sodium (LPS)

Answer: C

NEW QUESTION # 58
A 75-kW induction motor operates at 80% partial load and 88% efficiency. A new high-efficiency 75-kW motor can be installed that will operate at 95% efficiency (also at 80% partial load). What is the reduction in electric power demand?

A. 1 kW
B. 4 kW
C. 2 kW
D. 8 kW
E. 5 kW

Answer: B

NEW QUESTION # 59
Which problems can be caused by poor power quality?

A. Circuit breakers tripping
B. Equipment overheating
C. All of the above
D. Induction motors running backwards
E. Answers B and C

Answer: E

NEW QUESTION # 60
Why do electric utility companies transmit power at high voltages?
SELECT THE CORRECT ANSWER

A. Electrical frequency is more stable
B. Transmission power losses (12R) are less
C. Higher voltages are safer
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 # 61
......

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