JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II TRANSDUCERS AND INSTRUMENTATION Previous Question Paper (December - 2018 - 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.
PART - A
What is the use of Inductive Transducer in displacement measurement?
Answer
Inductive transducers are used to measure displacement by converting mechanical movement into a change in self-inductance or mutual inductance. This change is typically processed through an AC bridge circuit to provide a precise electrical output proportional to the linear or angular position of the object.
What is stroboscope?
Answer
A stroboscope is an instrument used to measure the speed of rotating or vibrating objects by producing short, periodic flashes of light. By adjusting the flash frequency to match the object's frequency, the object appears stationary, allowing for non-contact speed measurement.
What are the methods of force measurement?
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Write the different types of accelerometers.
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Describe the advantages of kelvin’s double bridges.
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What are the different types of analog to digital conversions?
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What is wave analyzer? Give its applications.
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What is hygrometer?
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What are the different methods of data transmission?
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Define the term ‘telemetry’.
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PART - B
With the help of neat block diagram explain the seismic transducer for measurement of displacement.
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Describe the properties of materials used for piezo-electric transducers. Derive expression for voltage and current sensitivities of pizeoelectric transducers.
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Explain the following methods of measurement of torque:
Digital methods
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Magnetostrictive methods.
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What is measurement of Differential Transformers? And explain the operation of phase angle adjustment of LVDT.
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Describe the working of a rectifier type voltmeter which uses a half wave rectifier circuit. Explain the effect of using a reverse biased diode on the working of the instrument.
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Derive the equations of balance for an Anderson’s bridge. Draw the phasor diagram for conditions under balance.
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Explain the Frequency Selective Wave Analyzers.
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Explain the different modes of operations of frequency synthesizer.
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Explain the construction and working principle of calomel electrode and glass electrode for measuring the pH of an unknown solution.
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Explain the following:
a) Radio Telemetry b) Rotary transformers c) Instrument connectivity and d) Cable data transmission
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What are the three types of optical fibers being in use cable transmission at present and why are they most suitable for instrumentation?
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