JNTU Kakinada B-Tech 3-1 RT31034 I INSTRUMENTATION and CONTROL SYSTEMS R13 April 2018 Question Paper

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Code No: RT31034
III B. Tech I Semester Supplementary Examinations, May – 2018
INSTRUMENTATION & CONTROL SYSTEMS (Mechanical Engineering)Time: 3 hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answering the question in Part-A is compulsory
3. Answer any THREE Questions from Part-B
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PART ?A
1 a) What do you mean by random errors? [4M]
b) List out the advantages of thermocouples. [4M]
c) State the working principle of piezo-electric transducer for the measurement of
acceleration.
[4M]
d) List some practical examples where strain measurement becomes essential. [3M]
e) Explain the working principle of pneumatic load cell for the measurement of
force.
[4M]
f) Define the process control system and automatic control systems. [3M]
PART ?B
2 a) Describe the elements present in the generalized measuring system block with the
suitable examples.
[8M]
b) Explain the working principle of variable-inductance transducer with a neat
sketch and also list out its advantages.
[8M]
3 a) Explain how pyrometric cones are used for the measurement of temperature. [8M]
b) Explain with the help of suitable sketches, the difference between a bellows
gauge and a diaphragm gauge for pressure measurement.
[8M]
4 a) Explain the working principle of operation of turbine flow with neat sketch and
also list out its advantages and disadvantages.
[8M]
b) Explain the measurement of vibration by the reed vibrometer, and the
stroboscope.
[8M]
5 a) Explain the principle on which the operations of an electrical resistance strain
gauge with neat sketch.
[8M]
b) What do you understand by a strain rosette? How is it used?
[8M]
6 a) Explain the working of psling psychrometer with neat sketch and also list out its
limitations in usage.
[8M]
b) Describe the constructional and operation of rope brake type of absorption
dynamometer.
[8M]
7 a) Explain the functions of each component of generalized feedback control system
with neat block diagram.
[8M]
b) Suggest a simple control system which automatically turns on a room lamp at
dusk and turn it off in day light. Draw the schematics and block diagram of the
suggested control system.
[8M]
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R13
SET – 1