JNTU
JNTU B.Tech I BASIC ELECTRICAL AND ELECTRONICS ENGINEERING Previous Question Paper (December - 2018 - R16)
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.
PART - A
(25 Marks)
For the circuit shown in figure 1. Find the relation between v1 and v2.
Answer
Assuming the circuit consists of two resistors R1 and R2 in series with a voltage source V, the relation is determined by the voltage divider rule: v2 = v1 * (R2 / (R1 + R2)). If the circuit implies a specific configuration like a transformer or dependent source, the relation is defined by the turns ratio or the gain constant respectively.
Explain Source transformation with the help of neat diagrams.
Answer
Source transformation is a technique used to simplify circuits by converting a practical voltage source into a practical current source, or vice versa. A voltage source V in series with a resistor R can be replaced by a current source I = V/R in parallel with the same resistor R. Conversely, a current source I in parallel with a resistor R can be replaced by a voltage source V = I*R in series with the same resistor R.
Write the statement of Super Position Theorem.
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What is Q-Factor and explain its significance?
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How does a diode appear as in its forward region of its characteristic? Explain.
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How does junction capacitance of a linearly graded junction varies with the applied reverse voltage VR?
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Differentiate between the terms hFE and hfe. Write the relationship between them.
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Draw the h-parameters model of transistor.
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Give different regions of operation of JFET.
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What is pinch-off voltage? Give its equation.
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PART - B
(50 Marks)
Find Vo in the circuit, shown in figure 2.
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Define and give symbols of the following: (i) Dependent sources (ii) Independent Sources (iii) Practical Sources (iv) Ideal Sources
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If Req=50 ohm, in the circuit shown in figure 3 find R?
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Calculate Vo and Io in the circuit shown in figure 4.
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A parallel Resonant circuit has R= 5KΩ, L=8mH, and C= 60μF. Determine: (i) Resonant frequency (ii) The band width (iii) The Quality Factor
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Solve for ‘i’ using Norton’s Theorem in the circuit shown in figure 5.
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Find vo using super position theorem in the circuit shown in figure 6.
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Find the Maximum power that can be delivered to R in the circuit shown in figure 7.
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Compare C, L, L-Section, Π-Section (CLC and CRC) Filters in all respects.
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Explain the operation of Half wave Rectifier with the help of neat diagrams.
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Obtain different equivalent Circuits of a PN Junction diode.
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Explain the VI characteristics of PN Junction diode with neat diagrams and explain. What is Static Resistance and Dynamic Resistance?
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Draw CE Configuration with Voltage – divider bias and then analyze Q-point and stability factors.
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Illustrate the input and output characteristics of BJT in three configurations.
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Compare BJT and JFET devices in all respects.
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Obtain the expression for the pinch off voltage Vp in case of n-channel JFET.
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Describe the principle of operation and V-I characteristics with the help of energy band diagrams. Highlight negative resistance region on the V-I characteristics.
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