JNTU
JNTU B.Tech IV INSTRUMENTATION AND CONTROL SYSTEMS Previous Question Paper (May/June - 2019 - 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 are the basic requirements of any measuring instrument?
Answer
The basic requirements of any measuring instrument are high sensitivity, high accuracy, high precision, good stability, and minimal loading effect on the system being measured.
What is the influence of temperature on the design of measuring instruments?
Answer
Temperature fluctuations affect the physical properties of instrument components, such as thermal expansion of metals, changes in electrical resistance, and variations in spring constants. These effects can introduce thermal drift and zero-shift errors, necessitating the use of temperature compensation techniques like bimetallic strips, compensation resistors, or thermal isolation in the design.
Give the classification of temperature measuring instruments.
Answer
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What are the limitations of diaphragm gauges?
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Differentiate between direct and indirect methods of level measurement.
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Explain the limitations of mechanical tachometers.
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Define gauge factor.
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What are the applications of load cells?
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Comment about the importance of control systems.
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Differentiate between closed and open loop control systems.
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PART - B
Explain the dynamic performance characteristics of measuring instruments.
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What are the various sources of error in measuring instruments? Suggest and explain the methods to minimize them.
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Explain the use of photo electric transducers for displacement measurement.
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Discuss various principles of pressure measurement.
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Explain various arrangements of manometers for pressure measurement.
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Describe the arrangement of thermocouples for low temperature measurement.
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Give the constructional details and explain the working of a bubbler level indicator.
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Explain the working principle of non-contact type tachometer.
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Explain the applications and limitations of hot-wire anemometer.
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Explain the principle of working of seismic instruments.
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Derive an equation for gauge factor.
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Explain the working of absorption psychrometer.
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What are strain gauge rosettes? Explain their applications.
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Explain the working of torsion meter.
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Describe a servomechanism and explain its working.
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List out the rules governing the construction of block diagram.
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Explain the working of position control system.
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