Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech I BASIC ELECTRICAL AND ELECTRONICS ENGINEERING Previous Question Paper (June - 2022 - R16)
Answer any five questions. All questions carry equal marks.
Main
State and explain the Kirchhoff’s laws with examples.
Answer
Kirchhoff’s Current Law (KCL) states that the algebraic sum of currents meeting at any junction or node in an electric circuit is zero. Mathematically, ΣI = 0. This is based on the principle of conservation of charge. For example, if currents I1 and I2 enter a node and I3 and I4 leave it, then I1 + I2 = I3 + I4.
Kirchhoff’s Voltage Law (KVL) states that the algebraic sum of all voltages around any closed loop in a circuit is zero. Mathematically, ΣV = 0. This is based on the principle of conservation of energy. For example, in a series circuit with a voltage source V and resistors R1 and R2, the sum of voltage drops across the resistors equals the source voltage: V = IR1 + IR2.
Calculate form factor for the sinusoidal wave form of v = Vm sin ωt.
Answer
The form factor is defined as the ratio of the RMS value to the average value of an alternating quantity.
For a sinusoidal waveform v = Vm sin ωt:
The form factor is calculated as:
Thus, the form factor for a sinusoidal waveform is 1.11.
Find the equivalent resistance between A and B terminals using Star-delta transformations.
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Find the complex power of a circuit, if applied voltage is 400∠30° V and current flowing through it is 10∠60° A.
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Discuss the phenomena of electrical resonance in a circuit where a coil is in parallel with a capacitor.
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State and explain Superposition theorem for d.c. excitation with suitable example.
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State and explain Norton’s theorem.
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Find the value of RL to get maximum power across it.
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With the help of circuit diagram explain the procedure of obtaining V-I characteristics of P-N Junction diode.
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Show that a full-wave rectifier is twice as efficient as a half-wave rectifier.
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Explain the effect of temperature on a diode.
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Write short notes on L-section Filters, π-section Filters.
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What are the different transistor biasing techniques? Explain them in detail.
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Compare BJT and FET.
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Explain the Construction and Principle of Operation of FET.
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