Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III BASICS OF SENSORS TECHNOLOGY Previous Question Paper (February - 2023 - R18)
Note: Part A is compulsory (25 Marks). In Part B, answer any one question from each unit (50 Marks).
Part A
State the working principle of Sensors.
Answer
Classify different types of sensors.
Answer
- Based on Power Source: Active sensors (require external power) and Passive sensors (generate their own signal).
- Based on Output Signal: Analog sensors (continuous output) and Digital sensors (discrete output).
- Based on Detection Property: Temperature, Pressure, Proximity, Optical, Acoustic, Chemical, and Motion sensors.
- Based on Transduction Principle: Resistive, Capacitive, Inductive, Piezoelectric, and Photoelectric sensors.
What is the Piezoelectric effect?
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Write the applications of thermocouples.
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Define relative velocity.
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Write the applications of gyroscopes.
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List the Different Methods of measuring consistency and Viscosity.
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Give specific gravity scales used in Petroleum Industries.
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What is a master sensor?
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Briefly explain the Variable Frequency Drive.
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Part B
Differentiate between thermistor and resistance temperature detector.
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Explain how capacitance can be used for sensing.
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Explain the operation of LVDT with a neat sketch.
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Enumerate the different cases of Eddy current sensors.
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Formulate the working principle of the piezoelectric sensor with an illustrative diagram.
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A piezoelectric sensor has C = 500 pF. The sensor leakage resistance is 10GΩ. The amplifier input is 5MΩ. Compute the lower corner frequency.
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Explain the Laws of Thermocouples.
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Discuss the cold junction compensation in thermocouples circuits.
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Discuss the various methods to measure rotational velocity.
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Explain the density measurement using the strain gauge load cell method and the buoyancy method.
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Draw and explain the industrial consistency meter to measure the consistency.
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Explain how level meters and microphones are helpful in measuring sound.
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Explain the interfacing of the density sensor.
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With a neat sketch, explain the interfacing of the viscosity sensor.
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