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AEE Certified Energy Manager (CEM) Sample Questions (Q100-Q105):

NEW QUESTION # 100
A desk lamp is located inside a windowless office. The office is heated during the winter and cooled during the summer. When the lamp is switched on, how much of the energy consumed by the lamp becomes heat in the office space?

A. 80%
B. 100%
C. 25%
D. 120%

Answer: B

Explanation:
* All electrical energy consumed by the lamp is converted into heatwithin the space, either as direct heat or as waste heat from the light source.
* In a windowless office, no energy escapes as light.The light energy that is emitted eventually turns into heat through absorption by surfaces.
Thus, the correct answer isC. 100%.

NEW QUESTION # 101
What does a manometer measure?

A. Pressure
B. Voltage
C. Distance
D. Volume

Answer: A

Explanation:
Amanometeris used to measurepressure, particularly in gases and liquids.
Step 1: Analysis of Each Option
* Pressure (A):#Correct. Manometers are commonly used in HVAC, industrial, and lab applications.
* Volume (B):#Incorrect. Volume is measured using flow meters or tanks.
* Distance (C):#Incorrect. Distance is measured using rulers or lasers.
* Voltage (D):#Incorrect. Voltage is measured using voltmeters.
Thus, the correct answer isA. Pressure.

NEW QUESTION # 102
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. Transmission power losses (12R) are less
D. Higher voltages are more stable

Answer: C

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 # 103
A compressed air system has a total volume of 247,500 liters. During a 30-minute break in production (air compressor system turned off and no production demand for compressed air), the system pressure drops from
7 bar, gauge (700 kPa, gauge) to 5 bar, gauge (500 kPa, gauge). Calculate the leakage rate in the compressed air system.

A. 8,250 liters/minute
B. 16,500 liters/minute
C. 22,750 liters/minute
D. 48,250 liters/minute
E. 32,000 liters/minute

Answer: B

NEW QUESTION # 104
Which of the following best describes a dead band in controls?

A. The delay in response of a system to a controlled change
B. A system which changes the output of a controller based on how fast a variable is moving from or to a set point
C. The difference between a sensor variable and its set point
D. A value that has been assigned to a controlled variable
E. A range around a set point with no change in state even though there is a change in sensor input

Answer: E

NEW QUESTION # 105
......

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