JNTU
JNTU B.Tech III SIGNAL CONDITIONING CIRCUITS Previous Question Paper (March-2024 - 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
Draw AC coupled Voltage divider for Dynamic measurements.
Answer
An AC coupled voltage divider consists of a DC voltage source connected to two resistors in series, with a coupling capacitor placed in series with the output terminal to block the DC component and allow only the dynamic (AC) signal variations to pass to the next stage.
List out the applications of Thermistors.
Answer
- Temperature measurement and control in industrial processes.
- Compensation for temperature variations in electronic circuits.
- Liquid level measurement and flow sensing.
- Medical equipment such as clinical thermometers and respiratory monitors.
- Surge current limiting in power supplies.
What is the need of carrier amplifier?
Answer
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Explain the operation of a phase detectors based on zero-crossing.
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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 50°C. Calculate its voltage noise from 0.1 to 10 KHz.
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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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How the SAW sensors work? Explain briefly.
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What are the applications of Ultra sonic based 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 shield grounding.
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Explain about Sensor bridge calibration and balance.
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Describe different detection methods used for Wheatstone bridges.
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How could you provide LVDT signal conditioning based on phase sensitive demodulation? Explain.
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Draw a circuit to convert angles in synchro into angles in resolver and explain.
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How could you provide signal conditioning for capacitive sensors? 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 40°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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What is the need of a Composite amplifier? Explain working of Composite amplifier.
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Explain the operation of ideal charge amplifier and describe the sources of zeros error in real charge amplifier.
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Explain the voltage to frequency conversion based on the charge balancing technique with a sketch.
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Explain about Digital Tachometer.
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Discuss briefly about Resonant sensors.
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Draw the general structure of current telemetry system and explain with a neat sketch.
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How could you detect the output of unbiased photodiode? Explain.
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Describe the principles of ultrasonic flowmeters.
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Explain the principles of fiber optic sensors.
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Compare magneto diodes and magneto transistors.
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