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Transcript
ELET 1300 FINAL NAME: FALL 2001 Closed Book/Notes, Eqn sheet ok Problem 1: Circle the best answer for the following questions: a. The current carriers in a metal are: 1. electrons 2. protons 3. ions 4. atoms b.A resistor color code of red-red-red means a resistance of: 1. 222 c. A kilowatthour (kwh) is a unit of: 1. voltage 2. current 3. power 4. energy d. How do you write 0.000000345 A using the micro? 1. 2. 3. 4. f. Which material would have the least reluctance to magnetic flux? 1. iron 2. copper 3. wood 4. carbon g. The unit of inductance is the: 1. Henry 2. Farad 3. Joule 4. Weber i. As the separation between capacitor plates gets smaller the capacity: 1. stays the same 2. gets larger 4. gets smaller 5. gets going j. How long will a battery with a 1.2 Ah rating deliver 24 mA? 1. 50 minutes 2. 28.8 hours 3. 50 hours 4. 20 hours 345 A 34.5 A 0.345 A 3.45 A Problem 2: Use Delta-Y or Y-Delta Transformation to find the resistance between terminals a and b of the following circuit: (resistance in Ohms) 5 a 2 4 3 2 b 1 2 3 Problem 3: Given the following circuit: (resistance in Ohms) a 4 (a) Determine the Thevenin Equivalent Circuit, draw the circuit and show the values and polarities. 6 6 10 V + b (b) Determine the Norton Equivalent circuit using the Thevenin. Problem 4: A simple capacitor is made of square parallel plates with a mica separator as shown. The plate separation is 0.15 mm and the relative permittivity of mica is r = 5. Find the square dimension, x, so the capacity will be 1.6 F. x Problem 5: In the following circuit the switch closes at t = 0. 10 k a. What is the time constant? + 20 V 50 F b. At what time will the voltage across the capacitor reach 15.5 volts? c. Sketch the current and capacitor voltage as a function of time Problem 6: Use MESH to find the equations which will solve the following circuit. Do not solve! Just determine the equations. 5 7 6 5 Problem 7: What current is required to have a flux of 6 x 10-4 Wb? path = 0.2 m I Cast Steel 100 turns Area = 0.001 m2 Problem 8: In the following circuit the switch has been in position a for a long, long time. At t = 0 the switch is moved to position b, now: 1 k b (a) What is the time constant ? a (b) What is the inductor voltage after 1 ms? 1 k + 20 V 0.25 H