JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II ELEMENTS OF ELECTRICAL AND ELECTRONICS ENGINEERING Previous Question Paper (May/June - 2019 - R13)
Note: This question paper contains two parts A and B. 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.
PART A
Define Kirchhoff’s current law.
Answer
Kirchhoff's Current Law (KCL) states that the algebraic sum of currents meeting at any junction or node in an electrical circuit is equal to zero. Alternatively, it can be stated as the sum of currents entering a node is equal to the sum of currents leaving that node, which is a direct consequence of the principle of conservation of charge.
State Flemming’s Left hand rule.
Answer
Fleming's Left Hand Rule is used to determine the direction of the force acting on a current-carrying conductor placed in a magnetic field. It states that if the thumb, index finger, and middle finger of the left hand are held mutually perpendicular to each other, then:
- The index finger points in the direction of the magnetic field.
- The middle finger points in the direction of the current.
- The thumb indicates the direction of the force (or motion) exerted on the conductor.
List out the advantages of AC generation.
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List out the applications of transformers.
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Mention the three torques required for the proper operation of indicating instrument.
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Which type of instrument is called as universal instrument? Give the reason.
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What are the three types of transistor configuration?
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How a transistor is used as a switch?
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What is the principle of CRO?
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Explain the sensitivity and deflection of a CRT.
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PART B
Figure shows a two D.C source network, the branch current I1 and I2 are marked in it. By using kirchoff’s law to find the current I1 and I2.
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A 25kW, 250V, dc shunt generator has armature and field resistances of 0.06ohm and 100ohm respectively. Determine the total armature power developed when working (i) as a generator delivering 25 kW output and (ii) as a motor taking 25kW.
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What is the necessity of starter during starting a DC motor? Explain the construction of three point starter.
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Explain different types of d.c generators.
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Describe the construction details of a 1- transformer and also explain the principle of operation.
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An alternator has the following data: i) Number of phases is 3 ii) Number of slots on the Armature is 90 iii) Number of poles is 10 iv) Number of conductor per slot is 8 v) Distribution factor is 0.965 vi) full pitched winding vii) flux per pole is 0.040 wb viii) speed of alternator is 600 rpm ix). Connection is star. Determine No Load Terminal Voltage.
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Explain the procedure to find out the regulation and efficiency of a 1- transformer.
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Explain the working of 3- induction motor.
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Explain the principle of operation of PMMC instrument with all constructional details.
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Briefly discuss the construction and working of a M.I instrument.
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List merits and demerits of moving iron type instruments.
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Explain the operation of half wave rectifier with neat sketch and derive the necessary expressions for Vav, Vrms form factor.
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Explain with a neat diagram how the input and output characteristics of a CE configuration can be obtained.
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The rms value of a sine wave.
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The phase difference between two voltages of the same frequency.
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What is the difference between a CRT and CRO? Draw a neat block diagram of a general purpose CRO and explain functions of each block.
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