JNTU
JNTU B.Tech I Year BASIC ELECTRICAL AND ELECTRONICS ENGINEERING Previous Question Paper (September - 2023 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Convert the given star network into an equivalent delta network (figure 1).
Answer
To convert a star network with resistances R1, R2, and R3 connected to nodes 1, 2, and 3 into an equivalent delta network with resistances R12, R23, and R31, the following transformation formulas are used:
Each delta resistance is calculated by taking the sum of the products of the star resistances taken two at a time and dividing by the star resistance that is not connected to the two nodes of the delta branch being calculated.
Determine the polar form of the voltage given by
Answer
The given sinusoidal voltage expression is in the form
To convert this to polar form, we use the RMS value of the voltage, defined as
What is Q-factor? How is it related to bandwidth and selectivity?
Answer
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Draw the Thevenin’s equivalent circuit for the given circuit to find the current through six Ohm resistor (figure 2).
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What is the need of a bleeder resistor in a dc power supply?
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What is the current supplied by the battery? Assume D to be an ideal diode (figure 3).
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Draw the input and output characteristics of CB configured BJT circuit.
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Calculate the current IE in a common emitter connected BJT circuit if β = 50 and IB= 20 μA.
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What is Pinch-off voltage of JFET?
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State the principle of operation of SCR.
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Part B
Using Mesh analysis find the currents through various resistors (figure 4).
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A two-element series circuit is connected across an ac source. The current in the circuit is given.
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Using super position theorem, determine the current through the resistor R=1Ω (figure 5).
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Discuss in detail the phenomenon of electrical resonance in a simple R-L-C series circuit.
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Describe the actions of Capacitor Filter, Choke filter and Capacitor input Filter.
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With a neat sketch, explain the working of a half-wave rectifier and derive its rectification efficiency.
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Determine the current gain, input resistance, voltage gain and output resistance of common collector transistor using hybrid equivalent circuit.
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Discuss in detail various types of biasing methods available for BJT.
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Explain the construction and working of a JFET.
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Write short notes on the working of:
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