(AUTONOMOUS)
B. Tech VII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R11/R11A)
INSTRUMENTATION AND CONTROL SYSTEMS
(Mechanical Engineering)
Date: 14 May, 2018 AN Time: 3 hours Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1. Explain the following Measurement methods:
i. Direct Method
ii. Primary, Secondary and tertiary Measurement
7M
Draw the block diagram of generalized measuring system. Explain the basic
components of this measurement system.
8M
2. List the mechanical detector transducers along with functions they perform. 7M
What are the parameters based on which a detector transducer is selected to
solve a particular problem. Explain in detail.
8M
Unit II
3. Explain the functioning of a Bubler level indicator. 5M
With a neat diagram explain the construction and working of a magnetic flow
meter.
10M
4. What is a laser Doppler anemometer? Explain how it is used for flow
measurement.
8M
Explain how pressure is measured using McLeod pressure gauge.
7M
Unit III
5. Explain how angular velocity can be measured by:
i. Stroboscope
ii. AC tachometer generator
8M
List the different simple instruments used for measuring acceleration and
vibration.
7M
6. Compare and contrast the working principle of vibrometer and accelerometer. 7M
How is a mechanical tachometer different from a non contact type tachometer?
8M
Unit IV
7. Explain how a resistance strain gauge can be used for measuring compressive and
tensile stress.
8M
Write a brief note on temperature indicators. 7M
8. Write a brief note on strain gauge Rosettes. 7M
What is a thermocouple? Explain how it can be used for measuring temperature
highlighting its advantages and disadvantages.
8M
Unit V
9. Compare and contrast the sling psychrometer and Absorption psychrometer used
for measuring humidity.
8M
Write a brief note on speed and position control systems. 7M
10. Differentiate between open and closed loop control systems. 8M
Explain the necessity for measuring the moisture content of gases. 7M