JNTU
JNTU B.Tech III MECHANICAL MEASUREMENTS AND CONTROL SYSTEMS Previous Question Paper (May/June - 2019 - R16)
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
Define Measurement.
Answer
Measurement is the process of comparing an unknown physical quantity with a predefined, accepted standard unit to determine its magnitude.
What is the principle of thermistor?
Answer
A thermistor operates on the principle of a temperature-dependent change in electrical resistance. It is typically made of semiconductor materials (metal oxides) that exhibit a large negative temperature coefficient (NTC), where resistance decreases significantly as temperature increases.
List why flow measurement is required.
Answer
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What is the principle of Laser Doppler Anemometer (LDA)?
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Define Stress and Strain.
Answer
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Explain about Stroboscope.
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What is Dew point?
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Describe the purpose of load cell.
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What is the importance of control system?
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List the applications of position and speed control systems.
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Part B
Briefly discuss on the applications of measuring instruments.
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Explain the causes of errors with suitable examples.
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How the displacements are measured by using piezo electric transducer.
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Explain the construction and working of a thermocouple.
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What are the different principles used to measure pressure? Explain.
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Discuss the indirect methods used to measure level.
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Explain about cryogenic fuel level indicators and Bubler level indicators.
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With neat sketch explain the working of mechanical tachometer.
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How to use electrical strain gauge? Explain.
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Explain the construction and working of Vibrometer and accelerometer.
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What is humidity? Explain about absorption psychrometer.
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Discuss about torsion meter.
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Briefly explain various methods of measuring force.
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What are the different elements of control systems? Explain.
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Explain speed control system with block diagram.
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With an example explain how to measure and control the temperature in open and closed systems.
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