Berkeley ELENG 100 - Practice Final Examination (4 pages)

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Practice Final Examination



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Practice Final Examination

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Pages:
4
School:
University of California, Berkeley
Course:
Eleng 100 - Electronic Techniques for Engineering
Electronic Techniques for Engineering Documents

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EECS 100 Spring Semester 1998 Practice Final Examination 3 Hours Closed Book Two 8 12 11 Sheets of Notes Allowed May 2 2003 1 30 minutes Refer to the circuit shown as Figure 1 a Write expressions for Kircho s Current Law at nodes X and Y b Make Thevenin Equivalents for the elements inside the dashed boxes A and B c Solve for voltages Vx and Vy d Find the power dissipated in the network as drawn in Fig 1 1 2 30 Minutes The circuit shown in Figure 2 is a parallel resonant LRC circuit with a resonant frequency f0 of 1 0 MHz a b c d Find the values of the components L and C in H and F Find the voltage appearing across the components at resonance Find the quality factor Q Find the frequencies at which the voltage across the components would be 3 0 dB from the voltage at resonance 3 30 minutes In the circuit shown as Fig 3 all four devices are nchannel MOSFETs with a value of k which is very large Logical 1 is 4 12 volts and the threshold voltage of the MOSFET transistors is 2 0 V Points A and B are considered inputs and X and Y are outputs a Find the relation between X and Y when A and B are at logic 0 b Find the logic values of X and Y when A 0 B 1 c Suppose that B 0 continuously but A brie y goes to logic 1 and then returns to zero what would X and Y be then d Name the speci c type of logic block that this circuit represents 2 4 30 minutes A load manager for PG E determines that his sector which includes Tracy and Manteca is drawing a total of 580 mega volt amperes MVA with an overall phase angle of ve degrees lagging However a commercial break is coming up on The Simpsons which causes customers to turn up their air conditioners a notch meaning an additional load of 70 MVA at thirty ve degrees lagging a Find the total load after the TV commercial active reactive and apparent power b Find the total current in each phase if the line voltage voltage between the phases is 380 kilovolt RMS and there are three phases c If the load manager were to switch in a synchronous



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