Energy Management Technician Exam: Key Questions and Answers

Jang Gang-sim emphasizes that diligent preparation ensures success in the Energy Management Technician written exam.

### Energy Management Technician Exam Questions Summary
Question 31 discusses a boiler using mercury as a heat transfer medium, with the answer being option 2: **heat transfer boiler**. Question 32 addresses gravitational potential energy, stating that the natural circulation of water is due to **differences in density**, with point 4 being incorrect as it suggests a **smaller area for circulation**. Question 33 highlights the feed water valve size for a boiler, indicating it should be **larger than the nominal diameter**, with the answer being option 2 for a **surface area of 12 m²**.

### Understanding Water Hardness and Treatment Methods
Water hardness is primarily caused by **calcium and magnesium**, leading to the formation of **scale and sludge**. Treatment methods for solid impurities include distillation, ion exchange, and chemical treatment, with ion exchange being the **most common for softening hard water**. Dissolved oxygen in water can cause **corrosion**, while gland packing types include braided, plastic, and metal, with synthetic resin packing **not corresponding to gland packing**. Flanges are used for disassembling and assembling connections in pipes and valves, and thermal conductivity **increases with temperature**. An air vent is installed at a high position in heating equipment to **eliminate trapped air and ensure even circulation**.

### Key Components and Concepts in Pipe and Boiler Systems
The protective agent for pipes, tanks, and walls **below 500 degrees Celsius** is effective, making option 1 the answer to question 39. Caps and plugs are the main components used to block the ends of pipes, with caps sealing **male-threaded pipes** and plugs used for **female-threaded pipes**. The hydraulic test pressure for a boiler with a maximum operating pressure of **0.3 megapascals** is **0.7 megapascals**, making option 3 the answer to question 41.

### Combustion Dynamics and Vacuum Heating Piping
Moisture in the fuel supply can disrupt combustion, leading to **instability and noise**, with **total failure possible** in certain cases. Induced draft or suction ventilation is used to draw in air for combustion in low-load boiler states, providing a **stable air supply**. In vacuum heating piping, maximizing lift fittings is not ideal; a **shorter distance and lower height** are more effective for maintaining vacuum pressure.

### Boiler Efficiency and Accident Causes
The height calculation results in **26.1** for question 45, with the answer being **option 2**. For question 46, the steel steam boiler's efficiency should be **over 98%**, making the answer **option 4**. Question 47 identifies **option 1** as the cause of boiler accidents not related to handling, while question 48 states that high-temperature corrosion is **external and not internal**.

### Clarification on Heating Load and Boiler Overheating Prevention
The occurrence of interference should be between the **lower surface** and the **management area**, not the upper surface. The heating load is determined by the **area**, and the standard direction adjustment will alter the **surface area** of the heating. For preventing boiler overheating, options 1, 2, and 3 are correct measures, while option 4, which suggests **concentrating the flame locally**, is incorrect.

### Precautions for Discharging Steam from a Boiler
Discharging steam from the boiler requires careful precautions, including discharging condensate to **prevent water hammer** and monitoring pressure fluctuations. The incorrect precaution is leaving the drain valve open after discharging, as it can lead to **excessive water drainage and other problems**. The use of an eccentric reducer in horizontal piping is recommended to **prevent the accumulation of condensate**.

### Key Points of the Energy Utilization Rationalization Act
The Act aims to **stabilize energy supply**, **promote efficient energy use**, and **reduce environmental damage**. Power transformers are not included in the **high-efficiency energy certification target**. The penalty for using equipment that has not passed inspection is **imprisonment for up to one year** or a **fine of up to 10 million won**.

### Energy Management Technician Exam Review: Key Questions and Answers
* 📚 This session reviews the Energy Management Technician written exam, focusing on questions starting from the 2016 third session, beginning with question 31 about a boiler using mercury as a heat transfer medium, where the answer is option 2: **heat transfer boiler**.
* ⚙ Question 32 addresses gravitational potential energy, confirming that **hot water circulates due to density differences**, making points one, two, and three correct, while point four is incorrect as **natural circulation requires a larger area**.
* 🔧 For question 33, the feed water valve for a boiler with a surface area of **12 m²** must be **larger than the nominal diameter**, leading to the conclusion that the answer is **option 2**.
* 💧 Question 34 discusses impurities in water; the correct treatment methods for suspended solids are **filtration and sedimentation**, confirming options one and two as correct, while option three is incorrect as **oil increases foaming and decreases ion exchange resin efficiency**.
* 🔥 In question 43, concerning oil boiler combustion issues, the least related cause to flickering flames is option 4, which states that **combustion in a low-load state is not a problem**.
* 🏗 Question 46 emphasizes that the steam generation efficiency of a steel steam boiler should be **above 98%**, aligning with the textbook's standards.
* 📈 The **Energy Utilization Rationalization Act** is referenced in questions 55-60, highlighting the importance of understanding **regulations, penalties, and the objectives of energy efficiency**, with specific answers provided for each question.
* 🎓 The session concludes with encouragement for students to prepare thoroughly for the exam, assuring them that following the theory lessons and **reviewing past questions** will **enhance their chances of success**.

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에너지관리기능사 필기 기출문제 풀이 2016년 제3회 (31~60번)

에너지관리기능사 필기 기출문제 풀이 2016년 제3회 (31~60번)