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# exam2 - io(0 = ii io(∞ = iii time constant τ = iv io(t =...

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Multiple choice exam (no partial credit) 1. Operational amplifiers are ideal in the circuit in Fig. 1.. Fig 1. Find the correct solution for V 0 among the following values: a) 80 mV b) 400/3 mV c) 200 mV d) 800 mV V 0 = _________________ 2. In the circuit of Fig. 2, let i s (t)=6e -2t mA, t≥0 and i 1 (0)=4mA. Find: i) v (t), t>0, ii) the energy in inductor L 1 at t=0.5s. Fig. 2. v(t) = ____________________ w 1 (0.5s) = __________________

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3. Choose the correct value for L eq that may be used to represent the inductive network of Fig.3 at the terminals. Fig. 3. a) 9 H b) 11 H c) 1 H d) 4 H e) 13 H L EQ = ________________ 4. For the circuit shown in Fig. 4, pick the equivalent capacitance at a-b terminals from the following choices: a) 50 μ F b) 10 μ F c) 40 μ F d) 16.4 μ F e) 15 μ F C EQ = ________________ Fig. 4
5. In the circuit in Fig. 5 the switch has been in position a for a very long time but moves instantaneously to position b at t=0. Determine: i) io(0) = ___________________

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Unformatted text preview: io(0) = ___________________ ii) io(∞) = ___________________ iii) time constant τ = ____________ iv) io(t) = _____________________ v) v o (t) = ____________________ Fig. 5 6. In the circuit in Fig. 6, find i x for t>0. Let R 1 =R 2 =1kΩ, R 3 =R 4 =2kΩ, and C=0.25mF. Fig. 6. i x = _____________________ 7. A camera flash circuit is shown in Fig. 7. The flash bulb resistance is Rf=0.5Ω, battery voltage Vs=9V. The flash bulb requires above 400mJ of energy to produce a reasonable flash. Also, the flash circuit should be ready for reuse after 5s. Find the required C and Rs to satisfy the above requirements. C = __________________ R S = _________________ Fig. 7 8. OP-AMPs in the circuit below are powered using ±20V power supplies. Which of the following is the output voltage? a) 20V b)-20V c) 15V d) 5V Vo=________________...
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exam2 - io(0 = ii io(∞ = iii time constant τ = iv io(t =...

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