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Free PDF Quiz CEM - Certified Energy Manager (CEM) –Trustable Valid Braindumps Ppt

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AEE Certified Energy Manager (CEM) Sample Questions (Q49-Q54):

NEW QUESTION # 49
A facility has a monthly peak power demand of 1,000 kW and an average power factor of 80%. The facility pays a demand charge of $7.50/kVA-month. What is the additional cost per month because the power factor is less than 100%?

Answer: D

Explanation:
To calculate the additional cost due to a power factor of less than 100%, follow these steps:
Step 1: Convert Real Power (kW) to Apparent Power (kVA)

Step 2: Compute Additional kVA Due to Power Factor


NEW QUESTION # 50
An energy-saving project costs $540,000. The project will have maintenance costs of $25,000 per year. The energy savings from the project are $160,000 per year. What is the simple payback of the project?

Answer: D

Explanation:
To determine the simple payback period for the energy-saving project, we need to apply the standard formula used in energy management as per the Association of Energy Engineers (AEE) Certified Energy Manager (CEM) guidelines. The simple payback period is a widely used metric in energy efficiency projects to evaluate how long it takes for the initial investment to be recovered through net savings. Let's break this down step-by-step using the provided data and CEM-aligned methodology.
Step 1: Understand the Simple Payback Formula
* Formula: Simple Payback Period (years)=Initial Investment CostNet Annual Savings ext{Simple Payback Period (years)} = rac{ ext{Initial Investment Cost}}{ ext{Net Annual Savings}} Simple Payback Period (years)=Net Annual SavingsInitial Investment Cost
* Definition: The simple payback period represents the time (in years) required for the cumulative savings to equal the initial investment, without considering the time value of money (e.g., discount rates or inflation).
* CEM Reference: AEE CEM training materials emphasize this formula in the "Energy Economics" section, where simple payback is a fundamental tool for assessing project feasibility.
Step 2: Identify Given Data
* Initial Investment Cost: $540,000 (one-time cost of the project).
* Annual Energy Savings: $160,000 per year (benefit from the project).
* Annual Maintenance Costs: $25,000 per year (additional cost incurred due to the project).
* Net Annual Savings: This must account for both the savings and the costs incurred annually.
Step 3: Calculate Net Annual Savings
* Definition: Net annual savings is the difference between the annual energy savings and any additional annual costs (e.g., maintenance).
* Verification: The problem specifies maintenance costs as an ongoing expense tied to the project, which reduces the effective savings. CEM guidelines require including such costs in payback calculations unless explicitly stated otherwise.
Step 4: Compute the Simple Payback Period
* Apply the Formula: Simple Payback Period=Initial Investment CostNet Annual Savings ext{Simple Payback Period} = rac{ ext{Initial Investment Cost}}{ ext{Net Annual Savings}} Simple Payback Period=Net Annual SavingsInitial Investment Cost Simple Payback Period=540,
000135,000=4.0 years ext{Simple Payback Period} = rac{540,000}{135,000} = 4.0 , ext{years} Simple Payback Period=135,000540,000=4.0years
* Result: The payback period is exactly 4.0 years, meaning it takes 4 years for the net savings to recover the initial investment.
Step 5: Validate Against Options
* Options:A. 2.0 yearsB. 3.0 yearsC. 4.0 yearsD. 5.0 years
* Check:
* If we ignored maintenance costs (incorrectly), payback would be 540,000160,000=3.375 rac
{540,000}{160,000} = 3.375 160,000540,000=3.375 years, which rounds to 3.4-not an exact match for any option.
* With maintenance costs included, 540,000135,000=4.0 rac{540,000}{135,000} = 4.0
135,000540,000=4.0, which matches option C precisely.
* Conclusion: Option C (4.0 years) is correct based on the net savings approach.


NEW QUESTION # 51
How can you tell if steam traps in a steam distribution system may NOT be working correctly?

Answer: A


NEW QUESTION # 52
What instrument is NOT used to measure temperature?

Answer: C

Explanation:
Step 1: Purpose of Each Instrument
* Hot-wire anemometer# Measures air velocity, NOT temperature.
* Bimetallic thermometer# Measures temperature using metal expansion.
* Thermistor# Measures temperature using resistance change.
* Thermometer# Directly measures temperature.
* Optical pyrometer# Measures high temperatures using infrared radiation.
Since ahot-wire anemometer measures airspeed, not temperature, the correct answer isA. Hot-wire anemometer.


NEW QUESTION # 53
How can commissioning reduce the life-cycle cost to owners and operators?

Answer: D

Explanation:
1) Life-Cycle Cost Reduction via Commissioning (CEM Guidance)
The AEE CEM Body of Knowledge emphasizes that commissioning reduces total life-cycle cost, not just first cost, through multiple pathways.
2) Evaluation of Each Option
* A. Reduce the cost of change orders during construction
* Early detection of design and coordination issues reduces rework.
* B. Improve the performance of energy systems
* Ensures systems operate at intended efficiency.
* C. Improve the satisfaction of building occupants
* Better comfort reduces complaints and operational disruptions.
* D. Improve the effectiveness of operations and maintenance
* Training and documentation improve long-term reliability and efficiency.
All are documented commissioning benefits in AEE CEM training materials.


NEW QUESTION # 54
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