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Posted Date: 28 Dec 2008 Posted By: pawan Member Level: Gold
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2005 Jawaharlal Nehru Technological University RR IV B.Tech. I Semester Regular Examinations, November -2005 TRANSDUCERS AND INSTRUMENTATION COMPONENTS Question paper
Code No: RR212203 Set No. 3
II B.Tech I Semester Regular Examinations, November 2005
TRANSDUCERS AND INSTRUMENTATION COMPONENTS
(Instrumentation & Control Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Define the following static characteristics with necessary examples and graphs:
i. Accuracy
ii. sensitivity
iii. static error
iv. Dead space
v. Drift. [10M]
(b) A voltage has a true value of 1.50 volts. An Analog indicating instrument
with a scale range of 0-2.50 volts shows a voltage of 1.46 volts. What are the
values of absolute error and correction. Express the error as a traction of the
true value and the full-scale deflection. [6M]
2. (a) Derive an expression for gauge factor of a strain gauge. Also find an expression
for a four arm active Wheatstone bridge output used to measure strain.
(b) Explain the classification of strain gauges with their salient features. [16M]
3. Explain the different principles of working of capacitive transducers. [16M]
4. (a) Write short notes on bimetallic thermometer. [6M]
(b) A bimetal strip 55 mm long is made of strips of nickel-chrome alloy and Invar
bonded together at 30oC. Each materials has a thickness of 1.5 mm. Find
the radius of curvature of the strip subjected to 110oC, Assume the following
data.
For Invar ! a1 = 1.5 × 10-6 oC-1 E1 = 1.5 × 1011N/m2.
For Nickel-Chrome alloy !
a2 = 12.5 × 10-6 oC-1 E2 = 2.3 × 1011N/m2. [10M]
5. (a) What is the coupling mechanism with operation of a cluch in an automotive?
(b) In what way are different from chain and belt drives?
(c) Enumerate the applications of friction drives. [16M]
6. (a) What are the types characteristics of plugs used in pneumatic control valve.
[8M]
(b) Explain the term valve rangeability. [8M]
7. (a) What is the difference between a switch and a relay.
(b) Explain the working of a electromechanical relay with a neat sketch and give
the applications. [12M]
8. (a) Discriminate between ordinary electric motors and Servo motors. [4M]
(b) Briefly explain the working of D.C and A.C servomotors with neat sketches.
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