QUIZ 2025 CEM: VALID CERTIFIED ENERGY MANAGER (CEM) LAB QUESTIONS

Quiz 2025 CEM: Valid Certified Energy Manager (CEM) Lab Questions

Quiz 2025 CEM: Valid Certified Energy Manager (CEM) Lab Questions

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Tags: CEM Lab Questions, Valid CEM Exam Online, CEM Valid Test Pass4sure, Reliable CEM Dumps Questions, Exam CEM Tutorials

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Free PDF Quiz 2025 Marvelous AEE CEM: Certified Energy Manager (CEM) Lab Questions

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AEE Certified Energy Manager (CEM) Sample Questions (Q51-Q56):

NEW QUESTION # 51
Using the natural gas combustion efficiency tables in your workbook, find the combustion efficiency (based on higher-heating value) of a natural-gas-fired boiler if the excess air level is measured at 31.9% and the stack temperature rise is 187.8°C.

  • A. 76%
  • B. 84%
  • C. 78%
  • D. 82%
  • E. 80%

Answer: D


NEW QUESTION # 52
In a PID control system, what is the purpose of the Proportional Gain?

  • A. Reduces/eliminates offset
  • B. Control point
  • C. Senses high load rate
  • D. Reacts to change

Answer: D


NEW QUESTION # 53
When should commissioning be included in the design and construction of a facility?

  • A. When construction is finalized
  • B. When the planning process begins
  • C. When the occupancy permit is accepted
  • D. When installation of the energy systems begins
  • E. When the design is finalized

Answer: B


NEW QUESTION # 54
Which of the following statements regarding refrigerants is NOT correct?
5ELECT THE CORRECT ANSWER

  • A. R-407C is a blended Hydro Fluoro Carbon or near Azeotropic mixture, and can be used as a replacement for R-22 in commercial applications
  • B. R-11 and R-12 are Chloro Fluoro Carbons with significant ozone depleting potential
  • C. R-32 and R-134a are Hydro Fluoro Carbons with zero ozone depleting potential, and significant global warming impact
  • D. R-1234yf is a Hydro Fluoro Olefin with zero ozone depleting potential, and little global warming potential
  • E. R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact

Answer: E

Explanation:
Understanding the environmental impacts of various refrigerants is crucial for energy managers. Let's analyze each statement:en.wikipedia.org A:R-407C is a blended Hydro Fluoro Carbon or near Azeotropic mixture, and can be used as a replacement for R-22 in commercial applications:This statement is correct. R-407C is a blend of HFCs designed to replace R-22 in air conditioning systems.
B:R-11 and R-12 are Chloro Fluoro Carbons with significant ozone depleting potential:This is correct. R-
11 and R-12 are CFCs known for their high ozone depletion potential.
C:R-1234yf is a Hydro Fluoro Olefin with zero ozone depleting potential, and little global warming potential:Correct. R-1234yf is an HFO with negligible ozone depletion and low global warming potential.
D:R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact:This statement is incorrect.R-22 is a Hydrochlorofluorocarbon (HCFC), not a Hydro Chloro Carbon.While it does have ozone-depleting potential, its global warming potential is considered moderate, not significant.
E:R-32 and R-134a are Hydro Fluoro Carbons with zero ozone depleting potential, and significant global warming impact:This is correct. Both R-32 and R-134a are HFCs with no ozone depletion potential but have considerable global warming potential.
Conclusion:
The incorrect statement is D. R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact. Therefore, the correct answer is D.


NEW QUESTION # 55
Air is heated from 10°C (dry bulb temperature) and 80% relative humidity to 32°C (dry bulb temperature).
What is the new relative humidity?

  • A. 40%
  • B. 60%
  • C. 30%
  • D. 20%
  • E. 80%

Answer: D


NEW QUESTION # 56
......

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