Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III MECHANICAL MEASUREMENTS AND CONTROL SYSTEMS Previous Question Paper (November/December - 2018 - R16)
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.
Part A
Discuss Pyrometer, where it is used.
Answer
A pyrometer is a non-contact temperature measuring device that detects thermal radiation emitted by an object. It is used in high-temperature industrial environments such as furnaces, kilns, and molten metal processing where contact sensors would be damaged.
Describe photo elastic transducer.
Answer
A photoelastic transducer utilizes the property of birefringence in certain transparent materials under mechanical stress. When polarized light passes through the stressed material, it splits into two components that create interference patterns (isochromatics) proportional to the applied stress, allowing for visual and quantitative stress analysis.
Describe the measurement of pressure using manometer.
Answer
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Discuss about the magnetic flowmeter.
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What is strain gauge Rosettes?
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What is a non -contact type of tachometer?
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How is moisture content of gases is measured?
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Describe the elastic force measurements.
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How are control systems classified?
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State the characteristics of feedback.
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Part B
Explain the principle of Photo electric transducer with a neat sketch.
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What are the different standard inputs for studying the dynamic response of a system?
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Explain the theory of radiation pyrometers. Describe the different receiving elements.
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Explain the calibration procedures of displacements.
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What principle is employed in the flow measurement by lader Doppler anemometer?
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Explain the working of the McLeod gauge with a neat sketch.
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Explain the direct method of level measurements and its applications.
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A simple U-tube manometer subjected to a step change of liquid by 100 mm. The first overshoot is 40 mm. Calculate the value of damping ratio if the liquid is replaced by a new liquid which is 0.8 times as dense as the old one.
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Explain the working of electric tachometer and its advantages.
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Determine the principal stresses and principal strains with the help of a delta rosette mounted on an aluminum specimens with the values of εa, εb, and εc.
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Explain the methods of usage of resistance strain gauge for bending.
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Explain the methods of excitation for vibration measurements.
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Explain the principle of elastic force meters.
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Describe the working of Absorption psychrometer.
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Explain with a neat diagram the method of measuring force using dynamometer.
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What are the different types moisture content of gases?
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Explain the open type servomechanism system with a neat sketch.
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Describe the position control system with a suitable application.
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Describe briefly pneumatic control system. State its advantages and disadvantages.
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Explain the temperature position control system with a sketch.
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