JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II TRANSDUCTION OF PHYSICAL VARIABLES Previous Question Paper (May/June- 2019 - R13)

Define Reproducibility and Repeatability.

A wattmeter having a range of 500 W has an error of ±2% of Full scale deflection. If the true power is 100 W, what would be the range of readings? Suppose the error is specified as percentage of true value, what would be the range of the readings?

Define Fidelity and Dynamic Error.

A temperature sensing device can be modeled as a first order system with a time constant of 5 seconds. It is suddenly subjected to a step input of 30°C – 150°C. What temperature will be indicated in 10 seconds after the process has started.

Calculate the thermoelectric sensitivity of a device using bismuth and tellurium as dissimilar metals. Estimate the maximum output voltage for a 100°C temperature difference at room temperature using one junction. The sensitivity of bismuth is -72 µV/°C and that of tellurium is 500 µV/°C.

Illustrate law of intermediate metals and law of intermediate temperatures, with figures.

Define Torr and Micron.

Draw the diagram of Pirani Gauge.

A pitot tube is used for measurement of velocity of flow of water having a density of 1000 kg/m³. Determine the velocity of flow at the head of the pitot tube, if it produces a differential pressure of 10 kN/m² between its two outlets.

Compare Electromagnetic Flow meter with Ultrasonic Doppler Flow meter.

Draw the block diagram of a Generalized Measurement System and explain the function of each block.

List out Static characteristics of a measurement system and discuss about sensitivity, linearity and resolution.

Discuss the classification of Transducers based on principle of Transduction.

Describe the Weston saturated and unsaturated cells as emf standards. What are the precautions taken while using them?

Derive the expression for the response of 2nd order underdamped system when subjected to a Unit step input. Sketch the response.

What are time domain specifications? Derive the expressions for Rise time and Peak time.

A practical example of First Order System is the Liquid Filled Thermometer. Justify.

Derive the expressions for magnitude and phase of a First order system when subjected to a sinusoidal input signal. Draw the magnitude and phase versus frequency plots. Describe how time constant and frequency of system influences response of First order system.

Draw various forms of manometers and explain their features.

Explain how different types of elastic transducers are used for pressure measurement.

Why is cold junction compensation necessary in temperature measuring schemes using Thermocouples? What is the recent trend in making such compensation? Discuss about it.

Discuss in detail the High Pressure Measurement.

Discuss in brief determining magnitude of velocity from pitot-static tube, with a neat diagram.

Discuss any one method of measurement of Sound, with neat diagram.

With a neat sketch explain the working of constant current type hot wire anemometer and compare it with constant temperature type.

Draw and explain the working of Knudsen Gauge.

Describe the working of Drag-Force flow meters with a neat schematic.

Show how a Rotameter scale is linearized? Is it permissible to mount a Rotameter horizontally? Justify.

Name the different types of obstruction type flow meters and briefly discuss the advantages and disadvantages of them.

Explain the working of positive Displacement meters with a neat diagram.