JNTU
JNTU B.Tech II ELECTRICAL CIRCUITS Previous Question Paper (November/December - 2018 - R13)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
What is meant by Super node?
Answer
A supernode is formed when a voltage source is connected between two non-reference nodes in a circuit. It is treated as a single enclosed entity, allowing the application of Kirchhoff's Current Law (KCL) to the entire supernode boundary while using the constraint equation provided by the voltage source.
Draw the characteristics of Independent and Dependent Sources.
Answer
An independent voltage source maintains a constant voltage regardless of current, while an independent current source maintains a constant current regardless of voltage. Dependent sources have characteristics where the output (voltage or current) is linearly controlled by another voltage or current elsewhere in the circuit.
Define the R.M.S. value.
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What is the significance of J-notation?
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Define the self and mutual inductances.
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Define the Q factor and write its expression.
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Define the tree and co tree.
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What is meant by Basic cutest Matrix?
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State the Tellegen’s theorem.
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Give the statement of Compensation theorem.
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Part B
When a triangular voltage wave form shown in figure 1 is applied across 2µF, calculate the current flowing through it.
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Calculate current in 2 Ω resistor using mesh analysis in the figure 2.
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Obtain V-I characteristics of R, L, C components.
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Two batteries A and B are connected in parallel and a total load of 10 Ω is connected across their terminals. Battery ‘A’ has an e.m.f of 12V and internal resistance of 2Ω and B battery has an e.m.f of 8V and an internal resistance of 1Ω. Using Kirchoff’s laws find the current flowing in each battery and also find potential difference across the external resistance.
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A coil having a resistance of 8Ω and an inductance of 0.05H is connected across a 230V, 50Hz supply, calculate: a) Current b) Phase angle between the current and supply voltage c) The apparent power, d) The active power e) Reactive power.
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A series R-L-C circuit consists of 200 ohms resistor and an inductor of 0.52H and a capacitor of unknown value. This circuit is supplied by 230V, 50 HZ supply and draws a current of 2.3A, and the current is in phase with the supply voltage. Find a) the value of the capacitance and b) the power supplied by the source.
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State Faraday’s law of electromagnetic induction.
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Compare magnetic circuit with electric circuit.
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A series RLC circuit with R = 40 Ω, L = 0.8 H and C = 10µF. If a constant voltage of 230V, at variable frequency is applied. Determine the frequency at which resonance occurs. Also find maximum voltage across L and C.
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By drawing basic cut set, find the value of I in the network shown in figure 3.
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Draw the dual network for the circuit shown in figure 4 and explain the procedure employed.
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Use Thevenin’s theorem to find the current through the 5-Ω resistor in figure 5.
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Find the current in the 5Ω resistor across AB of the network shown in figure 6 using superposition theorem.
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