JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II ELECTRICAL AND ELECTRONICS ENGINEERING Previous Question Paper (September/October - 2023 - R15)
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
What is the role of an instrument?
Answer
An instrument is a device used for measuring, detecting, or controlling physical quantities such as voltage, current, power, or frequency. Its primary role is to provide a quantitative indication or record of the state of an electrical system.
With an example, define KCL.
Answer
Kirchhoff's Current Law (KCL) states that the algebraic sum of currents meeting at any junction or node in an electrical circuit is zero, meaning the sum of currents entering a node equals the sum of currents leaving it. For example, if 5A and 3A enter a node, 8A must leave that node.
What is the purpose of armature winding in DC machines?
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What is the function of Yoke?
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What is a secondary winding?
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Define synchronous speed. What is its importance?
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Define reverse bias.
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What is the relationship between input and output voltages of a half wave rectifier?
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Define deflection.
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What is the relationship between frequency and time period?
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Part B
Describe in detail about star-delta transformations.
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For the circuit shown in the figure 1, find current ‘I’ and voltage ‘V’.
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Describe the working of moving iron instrument in detail.
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In the following circuit, find the voltages V1, V2, V3 and V4. (figure 2)
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Explain the functions of stator and rotor in a DC machine in detail.
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Describe briefly about different types of DC generators.
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How EMF is induced in DC generator? Explain.
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Derive the expression for torque in DC motor.
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What is an induction motor? How it works?
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Across the HV side of a single phase 200V/400V, 50 Hz transformer, a resistance of 10 Ω is connected with LV side supplied with rated voltage and frequency. Determine the current and impedance seen by the supply.
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Describe in detail about synchronous impedance method.
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A 10 kVA, single phase transformer has a turns ratio of 5:1 and is supplied from a 2 kV supply. Neglecting Losses, determine (i) Primary current (ii) The full load secondary current (iii) The secondary Voltage
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Draw the V-I characteristics of PN junction diode and describe.
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Draw the structure of PNP junction transistor and explain.
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With the help of neat circuit and waveforms, explain the operation of full wave rectifier.
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Draw the SCR characteristics and describe.
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What is the function of electron gun and glass envelope in CRT? Explain.
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Describe briefly about the applications of CRO.
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Describe in detail about electrostatic deflection.
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How voltage is measured using CRO? Discuss.
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