JNTU
JNTU B.Tech I Year FUNDAMENTALS OF ELECTRICAL AND ELECTRONICS ENGINEERING Previous Question Paper (September - 2023 - R22)
Note: This question paper contains two parts A and B. Part-A for 10 marks, Part-B for 50 marks. Part-A is a compulsory question consisting of ten sub-questions. Part-B consists of ten questions (numbered from 2 to 11) carrying 10 marks each. From each unit, there are two questions and the student should answer one of them.
Part A
Part-A is a compulsory question which consists of ten sub-questions carrying equal marks.
Differentiate Independent and Dependent sources.
Answer
An independent source provides a constant voltage or current regardless of the circuit conditions, whereas a dependent source provides a voltage or current whose value depends on the voltage or current elsewhere in the circuit.
State Kirchoff’s Voltage law.
Answer
Kirchhoff’s Voltage Law (KVL) states that the algebraic sum of all voltages around any closed loop in a circuit is equal to zero.
Define the form factor of a sinusoidal quantity.
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What is power factor?
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What is meant by back EMF?
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What are the types of DC Generators?
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Draw the circuit diagram of half wave rectifier.
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Give the expression for the average output voltage of a full wave rectifier.
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Give different operating regions of BJT.
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In a BJT, the emitter current is 12 mA and the emitter current is 1.02 times the collector current. Find the base current.
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Part B
Part-B consists of ten questions. Answer five questions from Part-B.
If Req=50 ohm, in the circuit shown in figure 1, find R?
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Two resistances R1 and R2 are connected in parallel and if the current entering the parallel combination is I. Calculate the values of currents I1 and I2 flowing in the resistance R1, R2 in terms I, R1, R2.
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What are the active and passive elements? Explain.
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Find the equivalent resistance between terminals x-y in the resistance network shown in Figure 2 below by using Y- Δ transformation.
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Define RMS value and Average value of an alternating quantity. Determine these values for a full wave rectified sine wave.
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A coil having a resistance of 10 ohms and an inductance of 0.2H is connected in series with a 100×10-6 F capacitor across a 230V, 50Hz supply, Calculate: i) The active and reactive components of the current ii) The voltage across the coil.
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Explain about phasor representation of alternating quantities.
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Find i) Current ii) p.f iii) active power and iv) reactive power of the following circuit(Figure 3).
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Explain the principle of operation of 3-Phase induction Motor.
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Determine the emf generated for an 4 – pole lap connected armature has 1120 conductors, a flux of 28 mWb per pole and a speed of 600 rpm.
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Explain with a neat sketch the constructional features of a DC machine.
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A 10-pole, 3-phase induction motor runs at a speed of 485 rpm at 50 Hz supply. Determine i) synchronous speed and ii) slip.
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Explain the operation of a half wave bridge rectifier with relevant waveforms.
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Derive expressions for ripple factor and efficiency of rectification for a full wave rectifier.
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Explain the V-I characteristics of p-n junction diode.
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Explain the operation of a full wave bridge rectifier with relevant waveforms.
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Explain the operation of BJT transistor with relevant diagrams.
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Draw and explain the CC Configuration of BJT.
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Draw and explain the CE Configuration of BJT.
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Illustrate the input and output characteristics of BJT in CB configuration.
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