JNTU
JNTU B.Tech IV INTRODUCTION TO INSTRUMENTATION 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
Define virtual instrumentation.
Answer
Virtual instrumentation is the integration of customizable software and modular hardware to create user-defined measurement systems. It allows a general-purpose computer to function as a specific instrument by using software to control data acquisition hardware, perform signal processing, and display results through a graphical user interface.
Distinguish the Data logging and data acquisition.
Answer
Data acquisition (DAQ) and data logging are both processes involving the collection of signals from sensors, but they differ primarily in their purpose, frequency, and data handling:
- Data Acquisition (DAQ): This process involves capturing high-speed, real-time electrical signals from sensors to monitor or control a system dynamically. It typically requires high sampling rates and is used for short-term analysis or immediate feedback loops.
- Data Logging: This process focuses on the long-term collection and storage of data over extended periods, such as hours, days, or months. Data loggers often operate at lower sampling rates and are designed for autonomous, unattended operation to track trends or environmental changes.
- Key Distinction: While DAQ systems are optimized for high-bandwidth signal processing and analysis, data loggers are optimized for reliability, power efficiency, and large-capacity storage for historical record-keeping.
What is a manometer and how does it work?
Answer
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Determine the atmospheric pressure at a location where the barometric reading is 740 mm Hg and the gravitational acceleration is g = 9.805 m/s2. Assume the temperature of mercury to be 10oC, at which its density is 13570 kg/m3.
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Explain Vena contracta point.
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Why does a Rota meter call as variable area meter? List any two forces acting on a Rota meter float.
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Enumerate the advantages of resistance type level measurement.
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State the principle of dew cell.
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List out the different types of dust monitors.
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Enumerate different types of Ion Selective Membrane.
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Part B
By utilizing deflection principle explain the working of strip chart recorder with help of a neat diagram.
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With help of a neat block diagram, explain the working of digital storage oscilloscope and explain its limitations.
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Define the different functions of data loggers and draw the block diagram of data logger.
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By employing time with respect to linear ramp, explain the working of digital voltmeter with relevant diagram.
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What is the maximum gauge pressure of water of height 1.5 m that can be measured by a Piezometer? If the liquid had a relative density of 0.85, what would the maximum measurable gauge pressure?
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By employing Boyles principle, explain how low pressure are measured with help of a neat diagram?
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A Capacitive transducer consists of two parallel plates of diameter 2cm each and separated by an air gap of 0.25mm. What is the displacement sensitivity?
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Explain in detail the different elastic type pressure transducers.
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A Rotameter has an effective height of 200 mm, effective base diameter of 10 mm and top diameter of 20 mm. It has a float of diameter 10 mm, thickness 3 mm and density 2500 kg/m3. Its discharge coefficient is 0.95; if water is flowing through it and the float is at 100 mm height, what is the rate of flow?
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Explain the principle operation of Thermal mass flow meter with neat sketch.
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Discuss in detail about the construction and working of Nutating disc type flow meter.
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Discuss about the working principle of Coriolis mass flow meter.
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Briefly discuss about electrolytic type hygrometer with help of a neat diagram.
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By employing Saybolt type viscometer explain how viscosity is measured with help of a neat diagram.
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Describe about the purpose of seismic accelerometers and its uses.
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By employing Bubbler technique explain how level is measured with help of a neat diagram.
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With relevant diagram, explain the principle and working of glass pH electrode.
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With help of a neat diagram, explain the working of paramagnetic oxygen analyzer.
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By employing optical technique explain how smoke measurement is done with help of a neat diagram.
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Explain the working of sodium analyzer with help of neat diagram.
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