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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-VII EXAMINATION WINTER 2018
Subject Code:X70903 Date: 26/11/2018
Subject Name: Industrial Instrumentation
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

Explain the following characteristics of a Transducer.
(i)Linearity Resolution Sensitivity Threshold
Repeatability Calibration Hysteresis.
07

Define Transducers. Discuss need of Transducers in process control industry.
07
Q.2

What is Piezo-resistive effect? Explain the term Gauge Factor with respect to
resistance strain gauge and obtain its expression in terms of poission's ratio.
07

Why temperature compensation is required in strain gauge? Explain temperature compensation through bridge arrangement.
07
OR

Explain working principle of Hall effect Sensors with its at least one industrial application.
07
Q.3

List different types of thermocouples used for temperature measurement
07

Which parameters decide Sensitivity of load cell? What are the limitations of Pirani Gauge?
07
OR
Q.3

What is synchros? Explain its working with application.
07

Explain the construction and working of LVDT used for measurement of displacement
07
Q.4

State and explain various principles of operation of Capacitive Transducers for level measurements.
07

What is Torque? Enlist different torque measurement techniques and explain any one in brief.
07
OR
Q.4

Explain principle of Venturi Tube for flow Measurement. Mention its advantages and disadvantages.
07

Explain Inductive method of level measurement with diagram
07
Q.5

Enlist Various recorders available for Field data measurement and Recoding purpose.
07

Write short technical note on Ultrasonic Flow Meter.
07
OR
Q.5

Explain the various elements of analog data acquisition system
07

What is sample and hold circuit? Why it is needed? Explain with circuit diagram
07