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NEW QUESTION # 61
What is a common method to reduce the impact of voltage imbalance?
- A. Install harmonic filters
- B. Rebalance single-phase loads
- C. Install capacitors to improve power factor on three-phase loads
- D. Reverse phase connections on three-phase motors
Answer: B
NEW QUESTION # 62
A compressed-air distribution system has one section that frequently has low pressure when demand for compressed air is high. How can you resolve the problem without increasing energy consumption?
- A. Decrease the distribution pipe size to the remote load experiencing low pressure
- B. Answers B and C
- C. Install a receiver tank near the remote load experiencing low pressure
- D. Raise the supply air pressure
Answer: C
NEW QUESTION # 63
According to ISO 50001. when performing internal audits on the energy management system in an organization the internal auditor should do which of the following?
SELECT THE CORRECT ANSWER
- A. Look for opportunities for energy improvement and to minimize bureaucracy inthe energy management system
- B. Review the written procedures related to the area under audit
- C. Assess actual activities as practiced against what the written procedures state
- D. Focus on the areas of significant energy use
- E. All of the above
Answer: E
Explanation:
When conducting internal audits of an Energy Management System (EnMS) in accordance with ISO 50001, auditors are expected to perform several key activities to ensure the system's effectiveness and continual improvement. These activities include:
* Focus on Areas of Significant Energy Use:Auditors should prioritize auditing areas that have substantial energy consumption, as improvements in these areas can lead to significant energy performance enhancements.
* Review Written Procedures Related to the Area Under Audit:A thorough examination of documented procedures ensures that they align with ISO 50001 requirements and organizational practices. This review helps in identifying any discrepancies between documented procedures and actual practices.
* Assess Actual Activities Against Written Procedures:Auditors compare on-ground activities with documented procedures to verify compliance and identify deviations. This assessment ensures that operations are performed as intended and in line with established protocols.
* Look for Opportunities for Energy Improvement and Minimize Bureaucracy:Identifying opportunities for enhancing energy performance is a core objective of the audit.Auditors should also aim to streamline the EnMS by reducing unnecessary complexities, thereby making it more efficient and user-friendly.
By encompassing all these activities, internal auditors ensure a comprehensive evaluation of the EnMS, leading to effective energy management and continual improvement. Therefore, the correct answer is E. All of the above.
NEW QUESTION # 64
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. 80%
- B. 40%
- C. 20%
- D. 60%
- E. 30%
Answer: C
NEW QUESTION # 65
At the end of a performance contract, who owns the equipment installed by the project?
- A. The bank
- B. The energy service company
- C. The equipment manufacturer
- D. The company that paid the contract payments
Answer: D
NEW QUESTION # 66
According to the institute of Electrical and Electronic Engineers (IEEE) standard 519. "Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems." the maximum total harmonic distortion (THD) for general low voltage systems less than 600 votts) should be:
SELECT THE CORRECT ANSWER
- A. Less than 20%
- B. Less than 5%
- C. Less than 10%
- D. Less than 1%
- E. Greater than 1%
Answer: B
Explanation:
The Institute of Electrical and Electronics Engineers (IEEE) Standard 519, titled "Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems," sets forth guidelines to maintain the quality of electrical power by limiting harmonic distortions. According to IEEE 519, for general low-voltage systems (defined as systems with a voltage less than 600 volts), the Total Harmonic Distortion (THD) of the voltage waveform should not exceed 5%. This threshold ensures the reliable operation of electrical equipment and minimizes potential issues such as overheating or malfunctioning caused by excessive harmonics.
Therefore, the correct answer is C. Less than 5%.
NEW QUESTION # 67
Which of the following instruments is most useful for tracking long-term boiler performance?
- A. The feedwater temperature sensor
- B. The drum water level gauge
- C. The exhaust stack temperature sensor
- D. The boiler room ambient temperature sensor
- E. The pressure gauge
Answer: C
NEW QUESTION # 68
If the initial design process includes group relamping, how can this reduce the number of lamps required to illuminate a space?
- A. Group relamping requires using larger Wattage lamps, which means fewer lamps are required to illuminate a space
- B. Group relamping reduces factors that contribute to light loss, which means fewer lamps are required to illuminate a space
- C. Group relamping cannot reduce the number of lamps required to illuminate a space
- D. Group relamping reduces the overall amount of lamp breakages, which means fewer lamps are required to illuminate a space.
- E. Group relamping improves the room cavity ratio, which means fewer lamps are required to illuminate a space
Answer: B
NEW QUESTION # 69
What type of passive heat exchanger can wrap around an evaporator coil to precool entering air and reheat the air after the cooling coil without adding more moisture to the supply air stream?
- A. Run-around coil
- B. Heat pump
- C. Desiccant heat wheel
- D. Plate and frame
- E. Heat pipe
Answer: E
NEW QUESTION # 70
Lighting systems operate with a certain recoverable light loss factor. Control systems with photocell sensor inputs combined with dimming ballasts can be used to regulate dimming levels to maintain a continuous light level in the work space. Which of the following best describes this type of control?
- A. Closed-loop controller
- B. Demand-limiting controller
- C. Two-position controller
- D. Open-loop controller
Answer: A
NEW QUESTION # 71
An air-conditioning unit delivers 10,000 kJ/h (thermal cooling). The equipment uses single-phase electrical power at 220-volt and 5.25 amps with a power factor of 100%. Calculate the coefficient of performance (COP).
- A. 13.2
- B. 2.4
- C. 3.2
- D. 16.1
- E. 6.2
Answer: C
Explanation:
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NEW QUESTION # 72
In general, which of the following is the least expensive and easiest way to finance an energy project?
- A. Debt
- B. Equity
- C. Performance contract
Answer: A
NEW QUESTION # 73
A building has a 100 m² wall with an R-value of 14.4 (m²-C/W) in a climate with 3,500 heating degree days (HDD). The building heater is 85% efficient [based on the fuel's higher-heating value (HHV)]. The fuel cost is $5.00/GJ [based on the fuel's higher-heating value (HHV)]. What is the annual cost of the heat loss through the wall?
- A. $16.22/yr
- B. $22.56/yr
- C. $14.44/yr
- D. $12.35/yr
- E. $10.56/yr
Answer: C
NEW QUESTION # 74
The International Performance Measurement and Verification Protocol (IPMVP) has how many categories (method options) to determine the performance of an energy- or water-consuming system?
- A. 2 Options
- B. 5 Options
- C. 4 Options
- D. 3 Options
- E. 6 Options
Answer: C
NEW QUESTION # 75
Electricity costs SO. 10 per kWh. if an electric water heater has an efficiency of 95*6. what is the equivalent price of natural gas per Gigajoule for a natural gas water heater? The natural gas water heater has an efficiency of 95*t based on lower-heating value.
[Natural gas has an energy content of 36.400 K|/m3 (higher-heating value) and 32-760 K/m3 (lower-heating value).] SELECT THE CORRECT ANSWER
- A. $15/GJ
- B. $33 /GJ
- C. $25 /GJ
- D. $21 /GJ
Answer: D
Explanation:
To determine the equivalent price of natural gas per gigajoule (GJ) for a natural gas water heater, we compare the cost of electricity and natural gas on an energy-equivalent basis.
Step 1: Convert Electricity Cost to Cost per GJ
* Electricity cost:$0.10/kWh
* 1 GJ =277.8 kWh
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NEW QUESTION # 76
Thermal scans of electrical equipment are useful for:
- A. Measuring the load on a refrigerant system
- B. Locating a loose electrical connection
- C. Locating areas of high power factor
- D. Reading current carrying capacity of installed conductors
Answer: B
Explanation:
Step 1: Purpose of Thermal Scans
Thermal scans (infrared thermography) detecttemperature variationsin electrical components.
* Loose connectionsincrease resistance # causeoverheating, which isvisible in thermal scans.
Step 2: Analysis of Each Option
* A. Locating areas of high power factor#Incorrect#Power factor is measured with power meters.
* B. Reading current-carrying capacity of conductors#Incorrect#Measured using ammeters and engineering data.
* C. Locating a loose electrical connection#Correct#Loose connections causeheat buildup, easily detected with thermal scans.
* D. Measuring the load on a refrigerant system#Incorrect#Refrigerant loads are measured using pressure sensors and flow meters.
Thus, the correct answer isC. Locating a loose electrical connection.
NEW QUESTION # 77
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