JNTU
JNTU B.Tech III MECHANICAL MEASUREMENTS AND CONTROL SYSTEMS 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
Give the classification of errors found in measuring instruments.
Answer
Errors in measuring instruments are primarily classified into three categories: Gross errors (human mistakes in reading or recording), Systematic errors (instrumental, environmental, or observational errors that follow a predictable pattern), and Random errors (unpredictable variations due to unknown causes).
What is the principle of working of thermistor?
Answer
A thermistor operates on the principle of the Temperature Coefficient of Resistance. It is a semiconductor device whose electrical resistance changes significantly with temperature. Most thermistors have a Negative Temperature Coefficient (NTC), meaning their resistance decreases as temperature increases, allowing for precise temperature sensing.
Recall the various units of pressure and mention the relationship among them.
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Relate the Doppler Effect to a flow measuring instrument.
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What is gauge factor?
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Explain the principle of working of vibrometer.
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What is the influence of humidity in gases?
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Explain the use of dynamometers.
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What are the basic elements of a control system?
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What are the applications of servosystems?
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Part B
Compare and contrast the advantages of various temperature measuring instruments.
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Discuss the importance of calibration of measuring instruments.
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Considering any temperature measuring instrument as an example, inspect the generalized configuration.
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Examine the principles of working of various displacement measuring transducers.
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Give the classification of pressure measuring instruments.
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Examine the usage of magnetic principle for the measurement of level.
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Compare the performance of laser doppler anemometer with other flow measuring instruments.
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What is the theme of low-pressure measuring instruments?
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Construct an electrical tachometer and discuss its features.
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Elaborate the use of strain gauge for measuring torque.
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Design strain gauge rosettes for various purposes.
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Propose the use of seismic principle for the design of accelerometer.
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Compare the principles of working of sling and absorption psychrometers.
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Explain the construction and working of torsion meter.
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What are load cells? Explain their working.
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Explain the working of dew point meter.
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Make use of block diagrams and build a model for speed control system.
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Apply the concept of closed loop system for control of temperature.
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