SampleTest3_2007_part_2

SampleTest3_2007_part_2 - = t . Find the current in the...

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Engr 260 -- Circuits & Devices Sample Test 3 Part 2: (Note: For Part 1, go to the class website.) 1. By means of the circuit below the voltage v C is to be brought to 13 V in 3 ms by closing S 1 , with S 2 kept open. The voltage v C is then to be kept at this constant value of 13 V by closing switch S 2 . Determine the values of the voltage V s and the resistor R to achieve these results. Ans: V s =50.16 V; R = 3.498 k Ω 2. The switch has been closed for a long time when it was opened at t=0. Find the voltage across the inductor for t>0. Ans: t e t v 6 10 15 20 ) ( × = V 3. For the circuit shown, find ) ( t i for 0 > t . Ans: t te t i 20 6 . 9 ) ( = A 4. The switch has been at the position shown for a long time when its position is changed at t=0. Find the current in the capacitor for t>0. Ans: 4 / 3 ) ( t e t i =
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5. For the given circuit the switch has been closed for a long time when it was opened at
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Unformatted text preview: = t . Find the current in the inductor for > t . Ans: t e t i + = 6 5 6 5 ) ( 6. For the circuit given below, V = 12 V, L = 0.8 H, R 1 = 3 , R 2 = 6 , and C = 0.25 F. Switch S has been open for a long time when it was closed at t=0. Find the current i t ( ) for t>0. ( ) o 87 . 36 2 cos 5 . 7 6 ) ( + = t e t i t 7. In the circuit shown, determine: (a) ( ) + R i , ( ) + L i , and ( ) + C i , (b) ( ) dt di R / + , ( ) dt di L / + , and ( ) dt di C / + , (c) ( ) R i , ( ) L i , and ( ) C i . Answer: 1.778 mA, 1.5 mA, 0.278 mA; 0 A/s, -6.1778 A/s, -6.1788 A/s; 1.778 mA, 0 mA. 8. In the circuit shown, let 2 ) ( = v V, and = + = t dt dv . Find ) ( t v for > t . Answer:...
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This note was uploaded on 04/28/2008 for the course ENGR 260 taught by Professor Enriquez during the Spring '08 term at San Mateo Colleges.

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SampleTest3_2007_part_2 - = t . Find the current in the...

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