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AEE Certified Energy Manager (CEM) Sample Questions (Q84-Q89):

NEW QUESTION # 84
In a chilled water thermal energy storage system, chilled water is stored at 4°C and used for supply water.
Chilled water return is 14°C. Calculate the storage capacity required to hold 50 GJ of thermal cooling. (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A. 1,191 m³
B. 4,180 m³
C. 766 m³
D. 2,618 m³
E. 1,356 m³

Answer: A

NEW QUESTION # 85
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. 80%
B. 84%
C. 78%
D. 76%
E. 82%

Answer: E

NEW QUESTION # 86
A steam trap with a 6-mm orifice in an 0.8-MPa steam system has failed open. The steam system is pressurized8.760 hours/yr. The steam cost is $15.00 /GJ. Using thetable below, what is the annualcost of the vented steam through the failed steam trap? ignore any condensate return issues.

[The question from the previous image, which was about calculating the annual cost of heat loss through a wall, but had a discrepancy between the calculated cost and the provided answer choices]

A. $40,000/yr
B. $10,000/yr
C. $5,000/yr
D. $30,000/yr
E. $20,000/yr

Answer: D

NEW QUESTION # 87
What is the main reason for using instrumentation in energy audits?

A. Validate utility energy bills
B. Determine energy flows
C. Save energy
D. Support the local economy

Answer: B

Explanation:
Instrumentation in energy audits serves multiple functions, but theprimary reasonis to determine energy flows.
* Measuring Energy Flows:
* Instrumentation helpsquantify energy usein different systems, such as electricity, HVAC, and industrial processes.
* It helps identifywhere energy is used, lost, or wasted.
* Supporting Energy Conservation Efforts:
* By measuring energy flows, auditors canidentify inefficienciesand recommend solutions.
* Other Options Analysis:
* Saving energy (A):A result of energy audits, not the main purpose.
* Validating utility bills (C):Important but secondary to understanding energy flows.
* Supporting the local economy (D):Not relevant.
Thus, the correct answer isB. Determine energy flows.

NEW QUESTION # 88
What is the definition of lamp life for a fluorescent lamp?

A. The time at which 50% of a large sample of lamps have failed
B. The time at which lumen output has reduced to 70% of the initial light output
C. The time at which lamps begin to fail
D. The time at which 70% of a large sample of lamps have failed
E. The time at which lumen output has reduced by 50%

Answer: B

NEW QUESTION # 89
......

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AEE Certified Energy Manager (CEM) Sample Questions (Q84-Q89):

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