JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year TRANSDUCTION OF PHYSICAL VARIABLES Previous Question Paper (April/May - 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
What is the function of variable manipulation element in an instrument?
Answer
The variable manipulation element performs the function of changing the signal representation or magnitude to a form more suitable for the next stage of the measurement system, such as amplification, attenuation, or filtering, without changing the information content of the signal.
Define the class of Standards available for use and Calibration process.
Answer
Standards are categorized into four classes: International Standards (defined by international agreement), Primary Standards (maintained by national laboratories), Secondary Standards (used by industrial labs for calibration), and Working Standards (used for daily bench calibration). Calibration is the process of comparing an instrument of unknown accuracy against a higher-accuracy standard to detect, report, and eliminate errors by adjusting the instrument's output.
Show the settling time in a graph and briefly explain about it.
Answer
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Illustrate the method to obtain the Sinusoidal transfer function of a system.
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Explain the working of a diaphragm.
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Discuss briefly any three Thermocouple laws used in industries.
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Present a list of various Vacuum gauges, types with their ranges.
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Briefly explain Sound level meter.
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What is the function of Ballistic flow prover?
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Explain briefly the principle of Drag-Force flow meter.
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PART- B
With generalized input output configurations describe desired input, interfering input and modifying input and their effects on the instruments.
Explain the frequency standard and its application.
Answer
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Define the static sensitivity of an instrument. With an example discuss the sensitivity to interfering and / or modifying input also.
The expected value of the voltage across a resistance is 90V. However the measurement gives a value of 79V. Calculate (i) Absolute error (ii) Relative accuracy (iii) % error and (iv) % of accuracy.
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Obtain the characteristic equation for the generalized mathematical model of measurement system and discuss on the various types of solutions you come across in it.
Describe the response of second order instrument for a step input with the help of graph.
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Obtain the frequency response of First Order System. Discuss the effect of time constant on the measurement accuracy.
Enumerate the behavior of liquid-in-glass thermometer with its response.
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Explain the principle of operation of Vibrating Cylinder and resonant transducers.
With the help of neat schematic show the basic elements of Dead Weight gage and explain its principle of operation.
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A platinum thermometer has a resistance of 100Ω at 25°C. i) Find its resistance at 65°C if the platinum has a resistance temperature coefficient of 0.00392/°C. ii) If the thermometer has a resistance of 150Ω, calculate the temperature.
Describe the system used for the measurement of very high Pressure with neat diagram.
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Draw and explain capacitor microphone and derive the transfer function.
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Illustrate with figure how Yaw Tube determines the direction of local flow velocity.
Discuss the factors that govern the selection of measuring device for Vacuum. Also explain working of Knudsen gauge.
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Explain the construction, working and theory of an Electromagnetic flow meter. Give the comparison of its operation, when it is excited by (a) dc and (b) ac.
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How can you differentiate Local flow meters from Gross flow meters? List out the different Gross volume flow meters and explain briefly their principles of operation.
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