Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech II ELECTRICAL AND ELECTRONICS ENGINEERING Previous Question Paper (November/December - 2017 - 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 Ohm’s law.
Answer
Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points, provided the temperature and other physical conditions remain constant.
Discuss about series resistive circuit with an example.
Answer
A series resistive circuit is one where components are connected end-to-end such that the same current flows through each resistor. The total resistance is the sum of individual resistances.
For example, if two resistors of 10 Ω and 20 Ω are connected in series, the total resistance is 30 Ω. The voltage drops across each resistor are proportional to their resistance values.
How should a generator be started?
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What is a DC series motor?
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Define voltage transformation ratio.
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What is the significance of slip?
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What is a rectifier?
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What is the relationship between break over voltage and gate current?
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What is the purpose of Cathode Ray Tube?
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What are the basic parts of a CRO?
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Part B
What is the basic principle of Indicating instrument? Explain.
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Find the current ‘i’ in the circuit shown in the figure1.
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What are the types of errors in any indicating instrument? Explain.
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Find the voltage ‘V’ in the circuit shown in the figure 2.
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Explain the differences between self excited and separately excited DC generators.
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A separately excited DC generator when running at 1200 RPM supplies 200 A at 125 V to a circuit of constant resistance. What will be the current when the speed is dropped to 1000 RPM and the field current is reduced to 80%? Armature resistance, 0.04 Ω and total drop at brushes, 2V. Ignore saturation and armature reaction.
Answer
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Explain in detail about the production of torque in DC motors.
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A DC motor takes an armature current of 110 A at 480 V. The armature circuit resistance is 0.2Ω. The machine has 6 poles and the armature is lap connected with 864 conductors. The flux per pole is 0.05 Wb. Calculate the speed and the gross torque developed by the armature.
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Discuss in detail about the principle of operation of alternators.
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Calculate the regulation of a transformer in which the percentage resistance drops is 1.0% and percentage reactance drop is 5.0% when the power factor is (i) 0.8 lagging (ii) unity and (iii) 0.8 leading.
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Explain in detail about the torque-speed characteristics of induction motor.
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A 25-kVA transformer has 500 turns on the primary and 50 turns on the secondary winding. The primary is connected to 3000-V, 50-Hz supply. Find the full load primary and secondary currents, the secondary EMF and the maximum flux in the core. Neglect leakage drops and no-load primary current.
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Draw the V-I characteristics of a P-N junction diode and explain.
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Explain in detail about the applications of SCR.
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Explain in detail about the half wave rectifier with neat sketch.
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With the help of physical structure, explain the operation of NPN transistor.
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Explain in detail about electrostatic deflection.
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Draw various Lissajous patterns and explain them.
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Discuss about Voltage and current measurements using CRO.
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Explain briefly about various applications of CRO.
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