GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Code: 2130901
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-III (NEW) EXAMINATION — SUMMER 2019
Subject Name: Circuits and Networks
Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) | Mention the relations between voltage and current for the following passive elements. (1) Resistor (2) Capacitor. | 03 |
| (b) | Define following terms: (a) Linear and Nonlinear Networks (b) Active and Passive Networks | 07 | |
| Q.2 | (a) | In the network of figure: 1, all sources are time invariant. Determine the branch current in the 2 ohm resistor using Source Transformation method. | 03 |
| (b) | State and explain Thevenin’s theorem | 04 | |
| (c) | Explain characteristic of an ideal voltage source. | 07 | |
| Q.3 | (a) | Find the value of all currents and the current in the 10O resistor for the network shown in figure 2 using mesh analysis. | 03 |
| OR | |||
| (b) | In the network of figure 3, Determine the node voltages V1, V2, & V3 using node analysis. | 04 | |
| (c) | Determine the equivalent inductance at terminals A-B for the circuit shown in figure: 4. | 07 | |
| Q.4 | (a) | Construct the exact dual of the network of figure 5. | 03 |
| (b) | Determine the value of I1 in the network of figure 6 using superposition theorem. | 04 | |
| OR | |||
| (c) | State and explain maximum power transfer theorem. | 07 | |
| Q.5 | (a) | Explain and derive the step response to R-L series circuit using Laplace Transformation method. | 03 |
| (b) | Explain the procedure to obtain sinusoidal steady state response of a circuit. | 04 | |
| (c) | Write the initial-conditions in the inductor and capacitor at t = 0+ and t = 8. | 07 | |
| Q.5 | (a) | Explain significance of poles and zeros in network functions. | 03 |
| (b) | What is time constant? Explain time constant in terms of RL and RC circuit | 04 | |
| OR | |||
| (c) | Determine the Laplace transform of f(t) = e-at cos?t. | 07 | |
| Q4 | (a) | Define: (1) Oriented Graph (2)Tree (3) Tie-set (4) Incidence matrix | 03 |
| (b) | The switch K is opened at t=0. Find out the values of ‘v’; ‘dV/dt’ and ‘d2V/dt2’ just after switching (at time t = 0+) in the circuit shown in the following figure 7. | 04 | |
| (c) | State and explain initial value theorem. | 07 | |
| Q4 | (a) | Derive the condition for the network to be reciprocal for ABCD-parameters. | 03 |
| (b) | Find the Z parameters for the network shown in figure 8. | 04 | |
| OR | |||
| (c) | Briefly describe Millman’s theorem. | 07 | |
| Q.3 | (c) | Determine y-parameters in terms of z-parameters. | 07 |
Date: 04/06/2019
Total Marks: 70
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