The scope of the examination is based on the teaching guidance plan of electronic and electrical specialty in secondary vocational schools of the Ministry of Education, and the related teaching materials in the Catalogue of Teaching Books for Secondary Vocational Schools published by the Provincial Department of Education are the main reference materials, including three professional core courses: Fundamentals of Electrical Technology, Fundamentals of Electronic Technology, and Electrical Instrument and Measurement, which mainly test the candidates' ability to understand and master relevant basic theories, basic knowledge and basic professional operations, as well as their ability to comprehensively apply these theories and knowledge to solve practical problems. The examination forms are divided into professional theory and skill test. The theoretical examination takes the form of closed written examination, and the skill examination takes the form of scoring examination according to the actual operation level.
Second, the written test paper structure
(A) the proportion of test paper content
Electrical technology foundation accounts for about 45%; Electronic technology foundation accounts for about 45%; Electrical instruments and measurements account for about 10%.
(2) Types and proportions of test papers
Fill in the blanks account for about15%; Multiple choice questions account for about 30%; Judgment questions account for about10%; Short answer accounts for about15%; Calculation questions account for about 30%.
(C) the difficulty ratio of the test questions
Easier questions account for about 50%; Problems with moderate difficulty account for about 35%; Difficult problems account for about 15%.
Third, the written content and requirements
Fundamentals of electrical technology
(A) the basic concept of the circuit
1. Understand the composition and function of the circuit.
2. Understand the concepts and units of basic physical quantities of circuits (electromotive force, current, potential and voltage).
3. Understand the concept of electric power and electric power, and master the calculation of electric power, electric power and Joule's law.
4. Understand the concept of resistance and the relationship between resistance and temperature, and master the law of resistance skillfully.
5. Understand the importance of electrical equipment rating.
6. Understand two important properties of electric field.
(2) Simple DC circuit
1. Be familiar with ohm's law of some circuits and ohm's law of closed circuits.
2. Understand several working states of the circuit (path, open circuit and short circuit), and master the calculation of current, voltage and power in each state.
3. Be familiar with the characteristics and functions of series-parallel resistors, and master the analysis and calculation of simple series-parallel circuits.
4. Master the analysis and calculation of potential at each point and voltage between two points in the circuit, and master its measurement method.
5. Understand two methods of measuring resistance: Voltammetry and Wheatstone Bridge.
(3) Complex DC circuit
1. Master the contents and applicable occasions of Kirchhoff's law, superposition theorem and Thevenin's theorem.
2. Using branch current method, superposition theorem and Weining theorem skillfully to analyze and calculate complex DC circuits.
3. Understand the concepts of voltage source and current source, and master the equivalent transformation between them.
(4) Capacitors and capacitors
1. Understand the concepts of capacitor and capacitance. ?
2. Familiar with the calculation method of parallel plate capacitor capacitance. ?
3. Master the characteristics of capacitor series-parallel circuit and the analysis and calculation of its withstand voltage. ?
4. Understand the charging and discharging process of capacitor, and master the calculation of electric field energy in capacitor. ?
(5) Magnetic field and magnetic circuit
1. Understand the physical meanings and units of the main physical quantities of magnetic field (magnetic induction intensity, magnetic flux, magnetic field intensity and magnetic permeability) and their relationships.
2. Be familiar with the right-hand spiral rule, the left-hand rule and the calculation of current force by magnetic field.
3. Understand the magnetization curve and hysteresis loop of ferromagnetic objects, as well as the magnetism of common magnetic materials and their applications in engineering technology.
4. Understand the concepts of magnetomotive force and magnetoresistance and the application of ohm's law of magnetic circuit.
(6) Electromagnetic induction
1. Understand the conditions of electromagnetic induction.
2. Master and apply the right-hand rule, Lenz's law and Faraday's law of electromagnetic induction.
3. Understand the phenomena of self-inductance and mutual inductance, and understand the concepts of self-inductance coefficient and mutual inductance coefficient.
4. Understand and master the judgment of mutual inductance coil and its series end with the same name.
5. Understand the generation of eddy current and its application in engineering technology.
6. Understand the energy storage characteristics and energy calculation of inductors.
(7) The basic concept of sinusoidal alternating current
1. Understand the generation of sinusoidal alternating current.
2. Understand and master the basic physical quantities describing sinusoidal alternating current (instantaneous value, maximum value, effective value, angular frequency, period, frequency, phase, initial phase and phase difference).
3. Master the analytical formula, waveform diagram and rotating phasor diagram of sinusoidal alternating current and their relationships.
4. Use phasor diagram to add and subtract sinusoidal alternating current skillfully.
(8) Sine AC circuit
1. Correctly understand the basic concepts in sinusoidal AC circuits.
2. Familiar with the analysis method of sinusoidal AC circuit and the addition and subtraction operation of phasor diagram.
3. Understand the role of resistance, inductance and capacitance in DC and AC circuits.
4. Familiar with the analysis and calculation of single parameter sinusoidal AC circuit.
5. Understand the analysis and calculation of RLC series, parallel and series-parallel sinusoidal AC circuits.
6. Master the conditions, characteristics and applications of series and parallel resonance.
7. Grasp the significance and methods of improving power factor.
(9) Three-phase AC circuit and motor
1. Understand the generation and characteristics of three-phase AC power supply.
2. Familiar with the relationship between phase voltage and line voltage of three-phase four-wire power supply. ?
3. Familiar with the analysis and calculation method of three-phase load star and triangle connection. ?
4. Master the structure, working principle, starting, braking and protection methods of three-phase asynchronous motor, and be familiar with the meaning of its nameplate data. ? 5. Understand the working principle and types of single-phase asynchronous motor and DC motor. ?
6. Understand the common sense of safe electricity use, and understand the methods and application scope of grounding protection.
(10) transformer
1. Understand the structure, types and uses of transformers.
2. Familiar with the law and calculation of transformer transformation voltage, current and impedance.
3. Understand the loss and efficiency of transformer.
4. Understand the structural characteristics, functions and common sense of several common transformers.
Fundamentals of Electronic Technology
(a) crystal diode and rectifier filter circuit
Understand the unidirectional conductivity characteristics of PN junction by length.
2. Understand the structure, classification and model of crystal diode.
3. Understand the unidirectional conductivity, volt-ampere characteristics and main parameters of crystal diodes.
4. Familiar with the composition, working principle, simple calculation of diode rectifier circuit and the selection of rectifier diode.
5. Understand the composition and working principle of several common filters, and master the analysis and calculation of capacitive filter circuits.
6. Master the characteristics and main parameters of silicon zener diode, master the principle of voltage stabilization and simple analysis and calculation of voltage stabilization circuit.
7. Understand the function and common sense of several commonly used special diodes.
(2) transistor and basic amplifier circuit
1. Understand the structure, classification, symbols and basic connection modes of transistors.
2. Master the amplification condition, amplification effect and current distribution relationship of transistors.
3. Understand the transistor's input characteristic curve, output characteristic curve (* * * emitter connection) and the division of its three working areas.
4. Understand the main parameters of the transistor, and master the discrimination of the working state of the transistor.
5. Master the composition, function and working process of the basic amplifier circuit of * * * transmitter.
6. Be familiar with the voltage-dividing bias circuit and understand the basic principle of stabilizing the static operating point.
7. Understand the influence of static operating point on the amplifier circuit.
8. Master the estimation method to find the static operating point, input resistance, output resistance and voltage amplification of the fixed bias circuit and the voltage dividing bias circuit.
(3) field effect transistor amplifier circuit
1. Be familiar with the structure, symbol, working principle, characteristic curve and main parameters of junction field effect transistor and insulated gate field effect transistor.
2. Understand the basic form of FET amplifier circuit and the function of main components.
(4) multistage amplifier and negative feedback amplifier
1. Understand the interstage coupling mode of multistage amplifier.
2. Master the calculation of voltage amplification, input resistance and output resistance of resistance-capacitance coupling multistage amplifier.
3. Understand the frequency response characteristics of the resistance-capacitance coupling amplifier.
4. Understand the concept and classification of feedback.
5. Understand the influence of negative feedback on amplifier performance.
6. Master the discrimination of feedback type in * * * emitter amplifier circuit, and qualitatively analyze its function.
7. Be familiar with the characteristics of emitter output devices and understand their applications.
8. Grasp the static operating point and voltage amplification of emitter output devices. Calculation of input resistance and output resistance.
(5) Low frequency power amplifier
Understand the main tasks and classification of low-frequency power amplifiers.
2. Be familiar with the difference between power amplifier and voltage amplifier.
3. Familiar with the method and characteristics of determining the type of composite pipe.
4. Understand the circuit composition and working principle of single-tube power amplifier, class B and A/B analogy pull power amplifier, input transformer inverter OTL power amplifier, complementary symmetrical push-pull OTL power amplifier and OCL power amplifier.
5. Master the calculation of maximum output power of complementary symmetric push-pull OTL power amplifier and OCL power amplifier.
(6) DC amplifier and integrated operational amplifier
Understand the composition characteristics of DC amplifier and the measures to solve the two main problems of inter-stage potential coordination and zero drift.
2. Understand the composition of basic differential amplifier circuit and the principle of restraining zero drift.
3. Understand the concepts and physical meanings of differential mode voltage magnification, * * mode voltage magnification and * * * mode rejection ratio.
4. Understand the principle of suppressing zero drift in actual differential amplifier circuit and the function of each component in the circuit.
5. Understand the shape and symbol of the integrated operational amplifier and two voltage magnifications.
6. Master the main characteristics of the ideal integrated operational amplifier working in the linear region.
7. Familiar with the analysis method and calculation of proportional operation circuit (inverting input, noninverting input), addition operation circuit and subtraction operation circuit.
8. Be familiar with the inverter and voltage follower composed of integrated operational amplifier, and know the common sense of using integrated operational amplifier.
(7) tuning amplifier and sine wave oscillator
1. Understand the frequency selection characteristics of LC parallel circuits.
2. Understand the working principles of single-loop tuning amplifier and double-loop tuning amplifier.
3. Master the conditions of self-excited oscillation.
4. Understand the working principle of LC sine wave oscillator.
5. Master the discrimination methods of self-excited oscillation produced by LC sine wave oscillator (transformer feedback type, three-point inductance type and three-point capacitance type).
6. Understand the composition, working principle and application of quartz crystal oscillator.
(8) DC regulated power supply
1. Understand the basic concepts such as function, classification, composition and quality index of DC regulated power supply.
2. Master the composition, working principle and estimation of output voltage regulation range of series transistor regulated power supply with amplification link.
3. Understand the external connection and main parameters of the three-terminal integrated regulated power supply.
(9) Thyristors and their applications
1. Understand the structure and symbol of thyristor.
2. Understand the working principle of thyristor, and master the conditions of thyristor turning on and off.
3. Understand the working principle of thyristor controlled rectifier circuit, and be familiar with voltage and current waveforms.
4. Understand the requirements of thyristor trigger circuit.
5. Understand the structure, symbol and negative resistance characteristics of single junction transistors.
6. Understand the working principle of single-junction transistor self-excited oscillator and synchronous trigger circuit, and draw the waveform correctly.
(10) Basic knowledge of digital circuits
1. Understand the basic concept of pulse, waveform and main parameters of pulse signal.
2. Understand the switching characteristics of diodes and triodes.
3. Master the conditions and characteristics of triode working in cutoff zone and saturation zone, and master the discrimination method and calculation of triode working state.
4. Be familiar with the representation methods of binary, decimal and hexadecimal, be able to convert between number systems, and be familiar with BCD codes.
5. Simplify logic function by formula method and Karnaugh map method.
6. Understand the concept of logic function, and master the common representation methods of logic function (logic function formula, truth table, logic waveform diagram).
7. Master the logic function, logic symbol, logic function and truth table of AND gate, OR gate, NOT gate, NAND gate, NOR gate, XOR gate, and draw the output signal waveform according to the input signal waveform.
8. Understand TTL and CMOS integrated gate circuits.
(1 1) combinational logic circuit
1. Understand the characteristics of combinational logic gates.
2. Master the reading method of combinational logic circuits. According to the given logic circuit diagram, the logic function is written and simplified, and the truth table is listed to explain the logic function of the circuit.
3. Familiar with the design method of combinational logic circuits. Logic circuits can be designed according to the functional requirements of gyro to realize this function.
4. Familiar with the basic concepts of encoder and decoder. Understand the pin function and application method of its integrated circuit.
(12) integrated trigger
1. Understand the working characteristics of the trigger.
2. Master the logic symbol, logic diagram, logic function and truth table of synchronous RS flip-flop composed of basic RS flip-flop and NAND gate, and draw the corresponding output waveform according to the input signal waveform.
3. Master the logic symbol and truth table of master-slave JK flip-flop, and draw the output waveform from the input signal waveform.
4. Master the logical symbols and functions of T-type flip-flops and D-type flip-flops.
(XIII) Sequential logic circuit
1. Understand the concept and classification of sequential circuits.
2. Master the analysis of simple sequential circuits and draw the output signal waveform according to the input signal waveform.
3. Understand the function of counter and master the composition principle of binary and decimal counter circuits.
4. Understand the functions and working principles of registers, counters and decoders.
5. Understand the common sense of using integrated counters.
(14) pulse generating and shaping circuit
1. Understand the charging and discharging process of capacitor and master the basic working principle of RC circuit.
2. Understand the functions and working principles of differential, integral, limiting and clamping circuits.
3. Understand the composition, function and working principle of monostable circuit and Schmidt circuit.
4. Understand the composition, function and working principle of multivibrator.
Electrical instruments and measurements
(1) Understand the classification of electrical instruments. ?
(2) Master the error of electrical instrument and its calculation.
(3) Be familiar with the structure of multimeter. ?
(4) Master the working principle of multimeter. ?
(five) master the use of multimeter and matters needing attention. ?
(six) to master the composition and working principle of oscilloscope. ?
(seven) master the use of oscilloscope.
Fourth, skills testing.
(A) the correct use of commonly used power tools
Including test pens, screwdrivers, needle-nosed pliers, wire cutters, electrician knives, wire stripping pliers, soldering irons, tweezers, scissors, etc.
(B) the correct use of common electrical and electronic instruments
Including multimeter, low frequency signal generator, oscilloscope, DC regulated power supply, etc.
(3) Identification and detection of common electronic components
Include resistors, capacitors, inductors, crystal diodes, triodes, thyristors, relays, etc.
(four) according to the circuit diagram, assembly drawing and related process documents, according to the general process requirements, complete all the assembly of general products, and use appropriate instruments to complete the testing and troubleshooting of specified projects.
(5) Debugging and troubleshooting of the whole machine
(6) Straight connection and T-shaped connection of single-stranded conductor and multi-stranded conductor, and insulation shall be restored. (According to the requirements of 220 volts and 380 volts)
(seven) to master the commonly used low-voltage electrical appliances.
Including combination switches, buttons, automatic switches, fuses, AC contactors, intermediate relays, thermal relays, etc.
(8) Install lighting circuit distribution board and fluorescent lamp circuit according to process requirements, and use double switches.
(nine) to master the installation and maintenance of the basic control circuit of common electric drive.
Includes three-phase asynchronous motor positive and negative rotation, starting, speed regulation, braking and other electrical control circuits.
(ten) to master the technical knowledge of electrical safety.