Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B. Tech III SIGNAL CONDITIONING CIRCUITS Previous Question Paper (May - 2018 - R15)
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
Define sensitivity of the voltage divider.
Answer
The sensitivity of a voltage divider is defined as the ratio of the change in output voltage to the change in the input parameter (such as resistance) that causes the variation. It represents the rate of change of the output voltage with respect to the sensor resistance.
Draw the instrumentation Amplifier circuit using two amplifiers.
Answer
A two-op-amp instrumentation amplifier consists of two operational amplifiers where the first stage provides high input impedance and differential gain, and the second stage acts as a difference amplifier. The circuit typically uses two input buffers (op-amps) connected to a common reference point, with a feedback network involving three resistors to set the gain.
Draw phase sensitive demodulator for LVDT based on half wave rectifier.
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Draw Inverting and non-inverting amplifier circuits for ac bridges.
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Differentiate chopper amplifiers and auto zero amplifiers.
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Draw the equivalent circuit for a piezoelectric sensor connected to charge amplifier.
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Differentiate incremental position encoders and absolute position encoders.
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Explain the principle of digital tachometer.
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What are the applications of image sensors?
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Explain the function of photo transistor.
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Part B
What is the need of instrumentation amplifiers? Mention its advantages and draw the instrumentation Amplifier circuit using three amplifiers.
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Discuss about signal circuit grounding.
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Describe the ideal and real characteristics of Wheatstone bridge using the deflection method.
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How could you reduce resistive interference? Explain with a neat sketch.
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Draw the structure of carrier amplifiers and also explain the fundamentals of it.
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Explain the working of synchro to resolver converter with a neat sketch.
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How could you measure capacitance by charge integration and switched capacitances? Explain.
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Draw and explain the basic circuit of Resolver to digital converters.
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A carbon film resistor has 100 KΩ and has 1.6 µV/V excess noise and it works in circuit at 400 C. Calculate its voltage noise from 0.1 to 10KHz, thermal noise power and total noise power.
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Describe the current measurement by integration with sketches.
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Explain different noise sources in amplifiers.
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Explain the principle of operation of a chopper amplifier with a neat sketch.
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Explain the working of vibrating wire strain gauges with a sketch.
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How could you measure frequency using frequency meter? Explain.
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How the vortex shedding flow meter works? Explain.
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Draw general structure of telemetry system and explain with a neat sketch.
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Draw the circuits of different amplifying modes used for unbiased photodiode output and explain them.
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Describe the principles of ultrasonic flowmeters.
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How the Semiconductor junction nuclear radiation detectors work? Explain.
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Explain about basic structure of Biosensor with a sketch.
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