JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II 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. Each question carries 10 marks.
Part A
Give the statement of KVL.
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. Mathematically, it is expressed as ΣV = 0.
Explain about the properties of parallel connection.
Answer
In a parallel circuit, the following properties hold:
- The voltage across each branch is the same.
- The total current is the sum of the individual branch currents.
- The reciprocal of the equivalent resistance is the sum of the reciprocals of the individual resistances: 1/Req = 1/R1 + 1/R2 + ... + 1/Rn.
- The equivalent resistance is always less than the smallest individual resistance in the circuit.
What are the different parts of DC Motor?
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Explain the principle of operation of DC Motor.
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Give the applications of 3-phase induction motor.
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What are the different factors that determine the efficiency of transformer?
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Draw the physical structure of P-N Junction diode.
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Write short notes on PNP transistor.
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Define Sensitivity of a CRT.
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Write short notes on magnetic deflection.
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Unit I
Explain the principle of operation of Moving coil instruments.
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Find the equivalent capacitance between a-b terminals of the circuit shown in figure 1.
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Explain the principle of operation of Moving iron instruments.
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Calculate the equivalent inductance across X-Y terminals of the circuit shown in figure 2. The mutual coupling between 6mH and 4mH inductance is 1mH.
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Unit II
With neat sketch, explain the principle of operation of DC Generator.
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Explain different types of DC Motors with schematic arrangement.
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Derive the EMF equation of DC Generator.
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Explain the working principle of three point starter in detail.
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Unit III
Explain in detail about the synchronous impedance method to find out the voltage regulation of an alternator.
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A transformer has negligible resistance and has an equivalent per unit reactance 0.1. Calculate the voltage regulation on full load and at 600 leading power factor angle.
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Draw the slip torque characteristics of Induction motor and explain.
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A 10 KVA, 200/100 V, 50 Hz single phase transformer has full load copper loss = 200 W and core loss = 112.5 W. At what KVA and load power factor the transformer should be operated for maximum efficiency?
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Unit IV
Draw the V-I characteristics of P-N junction diode and explain.
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Draw the circuit diagram of half wave rectifiers.
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Explain different modes of operation of NPN transistor.
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Explain the operation of diode in different biasing conditions.
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Explain the working of transistor as an amplifier.
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Unit V
Explain about electrostatic deflection in Cathode Ray tube.
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Describe how current and frequency is measured using CRO.
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Explain briefly about different parts of Cathode Ray tube and their roles.
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Explain how the voltage measurement can be made using Cathode Ray Oscilloscope.
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