JNTU
JNTU B.Tech IV MECHANICAL MEASUREMENTS AND INSTRUMENTATION 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
Differentiate the terms accuracy and precision?
Answer
Accuracy is the closeness of a measured value to the true or accepted value, whereas precision refers to the degree of repeatability or consistency among multiple measurements of the same quantity, regardless of their closeness to the true value.
What is the difference between primary and secondary transducers?
Answer
Primary transducers detect the physical quantity and convert it into a mechanical or other form of energy (e.g., a Bourdon tube). Secondary transducers take this output and convert it into an electrical signal (e.g., an LVDT attached to the Bourdon tube).
What are applications of bourdon tube pressure gauge?
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What is the use of Dead Weight tester?
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Define piezo resistivity?
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What are the advantages of fine wire strain gauge?
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Which materials are used in construction of Thermistor?
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What is See beck effect? Explain?
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How the sound is characterized?
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What is the significance of the Stroboscope?
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Part B
What is the significance of Signal conditioning? Explain in detail about the Signal Conditioning elements?
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List and explain the static performance characteristics of instruments.
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What is calibration and why is it necessary for an instrument? How do you proceed to draw the calibration curve, a correction curve and an error curve?
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What are transducers and how are they classified? Explain the importance in an instrument process?
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Explain the atmospheric pressure, gauge pressure and absolute pressure.
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What are devices used to measure the Low Pressures? Explain any one the Device?
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With neat sketch explain the Measurements of Vacuum Pressures using the Thermal conductivity Gauge?
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What is the difference between Well type manometer and inclined well manometer?
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Mention different techniques available for measurement of strain and explain the principle on which the operation of an electrical resistance strain gauge is based?
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Write the advantages and disadvantages of Electrical Strain gauges?
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Write about the diaphragm type strain gauge pressure transducer.
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Name the various types of strain gauges for different applications.
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What is basic principle of resistance thermometers or resistance temperature detector?
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What are advantages of thermistors or thermal resistors?
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What is the purpose of the Vapor Pressure Thermometer and explain its functioning?
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Write the differences between the Non electrical and Electrical methods for Temperature measurements?
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Write in detail about the sound pressure level, sound power level.
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Explain the piezo electrical crystal type Sound measuring system.
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Write the principle of tachometer and give its constructional details?
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Explain the linear variable differentiation transformer (LVDT).
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