JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV ELECTRONIC SENSORS Previous Question Paper (January/February - 2023 - R18)
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
What is an active and passive transducer?
Answer
An active transducer generates its own electrical output (voltage or current) without requiring an external power source, such as a piezoelectric crystal. A passive transducer requires an external power source to operate and functions by changing its electrical parameters like resistance, capacitance, or inductance, such as an LVDT or thermistor.
What are the advantages and disadvantages of an electrical transducer?
Answer
The advantages of electrical transducers include high sensitivity, ease of signal amplification, remote monitoring capabilities, and the ability to integrate with digital systems. The disadvantages include the requirement for an external power supply, susceptibility to noise and electromagnetic interference, and potential complexity in signal conditioning circuitry.
How is temperature range calculated using a thermocouple sensor?
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What are the three important aspects of a radiation thermometer?
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What is a Hall effect sensor?
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Explain Lorentz Force.
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Define cell constant. Mention the SI unit of cell constant.
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List two differences between electrochemical cell and electrolytic cell.
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Classify the sensors based on application.
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Discuss the parameters considered during selection of sensors.
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Part B
What is meant characterization of a sensor? Explain briefly about mechanical and thermal characterization of a sensor.
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What are the semiconductor strain gauges? Explain them in detail.
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Describe the principle of spectroscopic thermometry.
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Define noise thermometer. Explain various schemes of noise thermometry.
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Describe Dielectric Constant and Refractive Index thermo sensors.
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Write short notes on helium low temperature thermometer.
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Write a short note on Angular Movement Transducers and Semiconductor Magneto resistors.
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Discuss the working of Synchros.
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Explain Inductance Current Sensor.
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Discuss the working of electro ceramics in Gas media.
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What is Liquid Junction?
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Explain the Fibre optic sensors.
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Discuss about Nuclear radiation sensors.
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Explain the Sensors for environmental monitoring and aerospace sensors in detail.
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Describe with the help of diagram, how the primary sensors are being integrated with signal processing ensembles.
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