Circuit Foundation Simulated Test Paper 1 1. Single-choice questions: In the following questions, there are four alternative answers. Please put the only correct answer in brackets. (There are 7 sub-questions in this topic, totaling 35 points) 1. (5 points in this sub-question)The circuit diagram shows that the voltage of point a and point B to the ground, and () A. = 2 V, = 1 V, 1 A B. = 1 V, = 2 V, - 1 A C. = 2 V, = 2 V, 0 A D. = 1 V, = 1 V, 0 A 2. (5 points in this sub-question)As shown in the figure, the power conservation of the circuit is () A. resistance absorbs 1W power, current source supplies 1W power, B. resistance absorbs 1W power, voltage source supplies 1W output power, C. resistance and voltage source absorbs 1W power, current source supplies 1W power, D. resistance and current source absorbs 1W power, and voltage source supplies 1W power. 3. (5 points in this sub-question)The circuit is shown in the figure, when the switch is closed, then ()A. B. C. D. 4. (5 points in this sub-question) The port voltage and current of a given circuit are U(t) =[100cos (314t)+10cos (942t-30 degrees)+2.5cos (1570t-60 degrees)]V I(t) =[10cos(314t)+1.5cos(942t+30 degrees)]A Then the effective value of the voltage, the effective value of the voltage and the active power of the circuit are ()U I A. 100.5V, 10.1A, 1007.5W B. 37.5V, 5.75A, 503.75W C. 100.5V, 10.1A, 503.75W D. 71.08V, 7.15A, 503.75W 5. (5 points in this sub-question)In the case of A, the capacitive energy storage is equal to () A.0B.1 J C.2 J D.4 J 6(5 points in this sub-question)The two parameters of the Thevenin equivalent circuit of the two-terminal network are shown as follows:() A. 2V, 2B. 2V, 2.22W C. 7V, 2D. 7V, 2.22W 7. (5 points in this sub-question)A three-phase electric furnace with 20 kW power and 380 V voltage of symmetrical power supply wire is planned to be fabricated with resistance wire.If the three-phase resistor is connected to a symmetrical star, the resistance of each phase is equal to () A. 12.5W B. 7.22W C. 17.52W D. 4. 2. Fill in the questions: In the following questions, please fill in the answers required by the questions above each horizontal line in the stem. (There are 4 sub-questions in this topic, totaling 20 points) 1. (5 points in this sub-question)The nodal voltage equation of the circuit is __________________________ 2. (5 points in this sub-question)In the phasor model of the sinusoidal AC circuit, the leading angle is known, and if so, V. 3. (5 points in this sub-question)The circuit is shown in the figure, if the independent voltage source acts on the circuit alone, and when the independent current source acts on the circuit alone. 4. (5 points in this sub-question)Given the sinusoidal quantities of network ports V, A, Then complex power VA 3. (5 points for this question)Try to draw the waveform. 4. (10 points for this question)The diagram circuit has already reached steady state. At that time, the switch was closed. 5. (10 points for this question)The node analysis method is used to calculate the current in the sinusoidal AC circuit. 6. (10 points for this question)The circuit is illustrated and the sum is tried. 7. Non-objective questions (10 points for this topic)R L CSeries circuit connected to the power supply resonance, known resonance circuit current, capacitor terminal voltage 100 V.Try to find: (1) the value of circuit parameters; (2) the passband of the circuit.R, L, C Analog Test Paper 1 of Circuit Basis (Answer) 1. Single-choice questions: In the following questions, there are four alternative answers. Please put the only correct answer in brackets.(There are 7 subquestions in this topic, totaling 35 points) 1,,,,,,,,,C 2A 3C 4D 5B 6B 7B 2. Fill in the questions: In the following questions, please fill in the answers required by the end of the questions above each horizontal line in the stem. (There are 4 sub-questions in this topic, totaling 20 points) 1. 2. 3. ; 4.5+j8.66 3. Non-objective questions (5 points for this topic) 4. Non-objective questions (10 points for this topic) , 5. Non-objective questions (10 points for this topic) A 6. Non-objective questions (10 points for this topic) , VII. NON-OBJECTIVE PROBLEMS(Topic 10) (1), (2)

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