Đề thi cuối học kì 1 môn Kỹ thuật điện năm 2025-2026

This document serves as an examination paper for the "Electrical Engineering" course, administered during the first semester of the 2025-2026 academic year at Ho Chi Minh City University of Technology and Education. It is designed to rigorously assess students' foundational understanding and analytical capabilities across core electrical engineering principles. The assessment specifically evaluates competencies in analyzing direct current (DC) and alternating current (AC) circuit configurations, including single-phase and three-phase systems, alongside the operational characteristics of direct current (DC) motors. A robust grasp of these fundamental concepts is paramount for aspiring engineers, providing the essential groundwork for advanced studies and effective problem-solving in diverse electrical and electronics engineering applications.

Sinh viên ngành Kỹ thuật Điện, Kỹ thuật Điện tử, và các ngành liên quan cần nắm vững kiến thức cơ bản về mạch điện và máy điện.

This comprehensive academic examination is structured to evaluate students' proficiency in applying fundamental **electrical engineering** concepts to practical scenarios involving various circuit types and electrical machinery. The paper comprises four distinct problems. Initially, the assessment covers **DC circuit analysis**, where candidates are tasked with calculating currents, voltages, and power dissipation within resistive networks, thereby reinforcing their understanding of basic circuit laws. Following this, the focus shifts to **single-phase AC circuits**, requiring students to derive time-domain current expressions, compute effective voltages, and graphically represent phase relationships using phasor diagrams, which are crucial for AC steady-state analysis. The third problem extends to **three-phase AC circuits**, specifically involving a symmetrical Y-Δ system, challenging students to accurately depict the circuit topology and calculate critical parameters such as line current, reflecting its relevance in power distribution. Concluding the examination, the final problem addresses **DC motors**, necessitating calculations for key operational metrics including angular speed, electromagnetic power, input power, and electromagnetic torque for a separately excited motor. This section underscores the principles of electromechanical energy conversion. Collectively, these questions comprehensively test the theoretical knowledge and analytical skills required for practical **circuit analysis**, **electrical power** system comprehension, and **motor performance** evaluation, preparing students for real-world engineering challenges.