JNTU
JNTU B.Tech II BASIC ELECTRICAL AND ELECTRONICS ENGINEERING Previous Question Paper (April/May - 2023 - R18)
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
Establish the relationship between resistance, current, voltage, power and energy in an electric circuits.
Answer
The relationships are defined by Ohm's Law and the definitions of power and energy: Voltage (V) = Current (I) × Resistance (R); Power (P) = V × I = I2R = V2/R; Energy (E) = P × time (t).
What are the merits of poly phase circuits?
Answer
Merits include: higher efficiency and power factor, smaller size and weight for the same power rating, constant instantaneous power delivery, and better starting torque for induction motors.
What are the components of LT switchgear?
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What is the base criterion to classify the wires and cables?
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What are the losses in a transformer and how can these be kept low?
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Derive the torque equation of DC motor.
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What is the significance of barrier potential in a p-n junction?
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What is meant by rectifier efficiency? What is its value for a full wave and a half wave rectifier?
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Show the three types of transistor configurations.
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What do you understand by biasing of a FET?
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PART – B
Explain the concept of voltage and current source transformation with an example.
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Find the resistance between terminal XY of the bridge circuit shown in figure, by using delta-star conversion.
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Derive the relationship between line current, line voltage, phase current and phase voltage in case of balanced star and delta connection of three phase circuits.
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A resistance of 50 ohms, an inductance of 0.1 H and a capacitance of 50 μF are connected in series across a 230 V, 50 Hz supply. Calculate (i) the value of impedance, (ii) current flowing, (iii) power factor and (iv) power consumed.
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Explain the fuse and its characteristics? List out its merits.
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Describe the tripping mechanism of miniature circuit breaker.
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Compare lead acid battery with SMF lead acid battery.
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Discuss the importance of power factor improvement.
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Explain the working principle of single-phase transformer.
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A four pole wave connected DC armature has 50 slots with 10 conductors per slot. The armature is rotated at 1000 rpm of the useful flux per pole is 30 mWb, calculate the amount of EMF induced.
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Describe the construction and working principle of synchronous generators.
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A four pole, three-phase induction motor is connected to a 50 Hz supply. Calculate synchronous speed, the rotor speed when slip is 4 percent and the rotor frequency when the rotor is running at 1425 rpm.
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Explain how a p-n junction can be used to work as a diode.
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Draw and discuss the Zener diode characteristics? List out its applications.
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Draw and explain the circuit for a bridge rectifier and draw the input and output voltage waveforms.
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Describe the harmonic components in rectifier circuits and explain how to reduce them.
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Draw and explain the common emitter transistor characteristics.
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Describe the transistor as an amplifier with neat diagrams.
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Explain the construction and working of a junction field effect transistor.
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Compare of BJT and FET.
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