JNTU
JNTU B.Tech I Year BASIC ELECTRICAL AND ELECTRONICS ENGINEERING Previous Question Paper (March/April - 2023 - R16)
Note: Part A is compulsory (25 marks). Answer all questions. In Part B, answer any one question from each unit (50 marks total, each question carries 10 marks).
Part A
Define Electric Current and Voltage, write their units.
Answer
- Electric Current is defined as the rate of flow of electric charge through a conductor. Its SI unit is the Ampere (A).
- Voltage (or potential difference) is the work done per unit charge in moving a positive charge between two points in an electric circuit. Its SI unit is the Volt (V).
What is the significance of j-notation in analysis of A.C circuits?
Answer
The j-notation (where j = √-1) is essential in A.C. circuit analysis because it allows for the representation of sinusoidal quantities as phasors in the complex plane. Its significance includes:
- Converting complex trigonometric calculations into simple algebraic operations.
- Representing the phase relationship between voltage and current vectors.
- Easily distinguishing between resistive (real) and reactive (imaginary) components of impedance.
Define Bandwidth.
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State compensation theorem.
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What is the purpose of rectifier?
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Write the equation of diode current and explain its terms.
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Draw the symbols of NPN and PNP transistor.
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Write the relation between α and β in a BJT.
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Explain the purpose of biasing of FET.
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Draw the symbol for i) P-channel JFET, ii) N-channel JFET.
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Part B
State and explain Kirchoff’s laws.
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Obtain RAB of the circuit.
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Derive an expression for power in a single-phase circuit containing R element across sinusoidal voltage.
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Given i = 20sin(ωt - 60) and v = 200sin(ωt), find power across the circuit.
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Draw the admittance locus diagram of series RC circuit and explain.
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State and explain Superposition Theorem.
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State the steps to solve Norton’s current, resistance, load current and draw equivalent Norton’s circuit.
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Explain the concept of bandwidth and quality factor for series and parallel resonance circuit.
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Sketch the V-I characteristics of p-n junction diode. Represent the static and dynamic resistance.
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Compare half-wave, center-tapped full-wave, and bridge full-wave rectifiers.
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Compare ideal diode and practical diode.
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Explain the operation of capacitor filter in full wave rectifier.
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Explain active, saturation, and cut-off regions in transistor characteristics.
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Explain the constructional details of Bipolar Junction Transistor.
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Mention different types of transistor configurations and draw their circuit diagrams.
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Compare CE, CB, and CC transistor configurations. Which is widely used and why?
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Discuss the operation of varactor diode and list its applications.
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Explain Zener diode V-I characteristics and distinguish between Avalanche and Zener break downs.
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Explain the principle of operation of SCR.
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Explain the construction and operation of p-channel JFET.
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