Application-Oriented Engineering - Electronic Instrumentation - Quiz 1 | ENGR 4300, Quizzes of Engineering

Download Application-Oriented Engineering - Electronic Instrumentation - Quiz 1 | ENGR 4300 and more Quizzes Engineering in PDF only on Docsity! ENGR4300 Test 1B Spring 2007 1 of 12 ENGR-4300 Spring 2007 Test 1B Name ________________________ Section _2__ Question I (20 points) ___________ Question II (22 points) ___________ Question III (20 points) ___________ Question IV (20 points) ___________ Question V (18 points) ___________ Total (100 points) ______________ On all questions: SHOW ALL WORK. BEGIN WITH FORMULAS, THEN SUBSTITUTE VALUES AND UNITS. No credit will be given for numbers that appear without justification. ENGR4300 Test 1B Spring 2007 2 of 12 Question I. Resistive circuits (20 points) Given: V1 = 10volts, R1 = 2000Ω, R2 = 1000Ω, R3 = 1200Ω, R4 = 1800Ω. 1) Find the total resistance of the circuit, seen from the voltage source. (6 pts) 2) Find the voltage across R1. (4 pts) 3) Find the current through R3. (4 pts) ENGR4300 Test 1B Spring 2007 5 of 12 2) Given the circuit shown, which is the most likely voltage measured across resistor R2 if Vin = 1V cos(2πft), with f = 1Hz? (Please circle one.) (4 pts) a) 1V b) 0.5V c) 0V d) 2V 3) Given the circuit in 2), which is the most likely voltage measured across resistor R2 if Vin = 1V cos(2πft), with f = 100kHz? (Please circle one.) (4 pts) a) 1v b) 0.5v c) 0v d) 2v ENGR4300 Test 1B Spring 2007 6 of 12 4) What kind of filter response would best represent this circuit? (Please circle one.) (4 pts) a) Low Pass b) Band Pass c) High Pass d) Band Reject 5) What kind of response would result if the capacitor and inductor positions were swapped in the circuit? (Please circle one) (4 pts) a) Low Pass b) Band Pass c) High Pass d) Band Reject 6) What is the resonant frequency of the circuit in Hz? (2 pts) ENGR4300 Test 1B Spring 2007 7 of 12 Question III – Transfer Functions (20 points) R1 C R2 L 1 2 0 V1 1Vac VoutVin V R2 1) What is the transfer function (Vout/Vin) for the circuit in terms of R1, R2, L, & C? You must simplify. (6 pts) 2) What is the simplified transfer function of the circuit at low frequencies? (3 pts) ENGR4300 Test 1B Spring 2007 10 of 12 3) Find the value for N that allows the circuit in 2) to see the same load on the primary (source) side of the transformer as in 1). (4 pts) 4) Knowing that a real transformer’s behavior deviates from that of an ideal, what would be an appropriate minimum value for the inductance on the primary of the transformer in 1), given the source’s frequency of 60Hz? (4 pts) a) 0.003mH b) 0.3mH c) 30mH d) 3H ENGR4300 Test 1B Spring 2007 11 of 12 Question V – Instrumentation, PSpice and components (18 points) R1 1k C1 0.3uF A B You are asked to generate a 0.8Vp-p 50Hz triangle wave on function generator 1 and display its waveform on channel 2 of the oscilloscope. The signal is to be fed into the RC low pass filter shown above (A) and the output of the filter (B) displayed on channel 1 of the oscilloscope. 1) Draw all the lines on the above figure to represent the wires needed to see the desired waveforms. (4 pts) 2) To what value should the function generator’s amplitude be set for this? (2 pts) 3) It is desired to see 5 cycles of the triangle waveform across the full oscilloscope screen (10 divisions). To what time scale, in sec/div should the scopes sweep rate be set in order to see this? (2 pts) ENGR4300 Test 1B Spring 2007 12 of 12 4) To simulate the scope’s screen above in PSpice, what type of analysis is would be done on the schematic? Circle one of the following: (2 pts) Time Domain (Transient) DC Sweep AC Sweep Bias Point 5) If the input to the circuit is changed to a sine wave, what type of analysis would be useful for determining when the output amplitude drops to half that of the input amplitude? Circle one of the following: (2 pts) Time Domain (Transient) DC Sweep AC Sweep Bias Point 6) Two 8 1W 1kΩ resistors are in parallel. What is the maximum voltage that can be applied across the pair without exceeding the power rating of the devices? (2 pts) 7) If the two resistors in 6) are reconfigured in series, what is the maximum voltage that can be applied across the 2 series resistors without exceeding the power rating of the devices? (2 pts) 8) What would be the color code of the equivalent resistance in 7) (assuming nominal 10% tolerance resistors)? (2 pts)