Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III SIGNAL CONDITIONING CIRCUITS Previous Question Paper (November/December - 2018 - R15)
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 and may have a, b, c as sub questions.
Part A
Define sensitivity.
Answer
Sensitivity is defined as the ratio of the change in the output signal of a sensor to the corresponding change in the input physical parameter being measured. It represents the slope of the input-output characteristic curve.
What is the importance of grounding techniques?
Answer
Grounding techniques are essential to establish a common reference potential for electronic circuits, ensuring safety and minimizing electromagnetic interference (EMI). Proper grounding prevents ground loops, reduces common-mode noise, and protects sensitive instrumentation from electrical surges or static discharge, thereby maintaining signal integrity.
Give the classifications of variable reactance sensors.
Answer
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What is a Lock-in amplifier?
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What are the two methods by which current can be measured with an electrometer amplifier?
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Write short notes on drift in instrumentation amplifier.
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What are the merits to be considered when the field bus is introduced?
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Explain the working principle of SAW sensors.
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Explain how fiber optic sensor works.
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What are the differences between CCD and CMOS image sensors?
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Part B
With neat schematic explain Wheatstone bridge using deflection method resistive sensors.
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How are signal conditioning circuits affected due to interference signal? Describe different techniques to reduce the effect of interference.
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Explain the operation of an AC bridge with bridge calculations.
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With neat schematic explain synchro-to-resolver converter.
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With the help of block diagram explain the principle of operation chopper amplifier.
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Show how the perturbations or noise affect the performance of amplifiers.
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Show how coded signal is obtained as an output corresponding to the changes in position in Absolute Position Encoder.
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With neat schematic explain Digital quantity-to-frequency conversion.
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How are ultrasonic sensors different in operation from other sensors? Explain the principle of operation of ultrasonic sensors.
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With the help of block diagram explain CCD line imaging sensor? Write its applications.
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