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Courses » Principles of Mechanical Measurement
Unit 7 - Week 6 :
Stress and strain measurement
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Week 1:
Introduction to Measurement
Week 2 : Response of Measurement Systems
Week 3 : Digital Techniques in Measurement
Week 4 : Data Processing
Week 5 : Displacement Measurement
Week 6 : Stress and strain measurement
Week 7 : Force and Torque
Quiz : Assignment 6 Lecture 1 : Resistive strain gages &
associated circuitry Lecture 2 : Strain gage rosettes & gage orientation
Due on 2019-03-13, 23:59 IST.
1) 1 point
2) 1 point
3) 1 point
Assignment 6
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Among the following choices for the grid material, which one can lead to negative gage factor?
nichrome manganin monel nickel
No, the answer is incorrect.
Score: 0
Accepted Answers:
nickel
Among the following choices for the grid material, which one is not suitable for high-temperature applications?
nichrome isoelastic monel
platinum-iridium No, the answer is incorrect.
Score: 0
Accepted Answers:
isoelastic
Poisson’s ratio is defined as the ratio of lateral to longitudinal strains
negative of the ratio of lateral to longitudinal strains ratio of longitudinal to lateral strains
negative of the ratio of longitudinal to lateral strains No, the answer is incorrect.
Score: 0
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Principles of Mechanical Measurement - - Unit 7... https://onlinecourses-archive.nptel.ac.in/noc19...
1 of 4 Wednesday 12 June 2019 12:35 PM
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Week 8 : Pressure Measurement
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Week 9 : Flow Measurement
Week 10 : Temperature Measurement
Week 11 : Motion Measurement
Week 12 : Special topics
4) 1 point
5) 1 point
6)
1 point 7)
1 point Accepted Answers:
negative of the ratio of lateral to longitudinal strains
For a perfectly incompressible material, the magnitude of Poisson’s ratio is 0.5
0.8 1.0 2.0
No, the answer is incorrect.
Score: 0
Accepted Answers:
0.5
Lead-wire error refers to the error appearing because of the insufficient meter resistance on the output side change in bridge resistance with temperature self-compensation characteristics
long wires connecting gage & other instrument No, the answer is incorrect.
Score: 0
Accepted Answers:
long wires connecting gage & other instrument
The outer surface of a cylindrical pressure vessel is subjected to 400 μm per m of hoop strain, but negligible longitudinal strain. Corresponding Poisson’s ratio is 0.3 and modulus of elasticity is 203 GPa. Then the corresponding longitudinal stress (correct to 2 decimal places) is ______________ MPa.
No, the answer is incorrect.
Score: 0
Accepted Answers:
(Type: Range) 26.0,27.5
A strain-gage ballast circuit is comprised of a ballast resistor of 100 Ω and excitation voltage of 5 V. If it is designed to ensure the maximum sensitivity with a gage factor of 2, then the change in the output voltage corresponding to an imposed strain of 12.5 μm per m (correct to 2 decimal places) is ______________ μV.
No, the answer is incorrect.
Score: 0
Accepted Answers:
(Type: Range) 31.1,31.4 HintHint
HintHint
Principles of Mechanical Measurement - - Unit 7... https://onlinecourses-archive.nptel.ac.in/noc19...
2 of 4 Wednesday 12 June 2019 12:35 PM
8)
1 point 9)
1 point 10)
1 point Strain in a Cantilever beam section is measured using a resistance strain gage (gage factor = 2), which forms one arm of bridge circuit, in a quarter-bridge configuration. If the initial resistance of each arms of the bridge is equal, then the ratio of the bridge output to input voltage for an imposed strain of 12.5 μm per m (correct to 2 decimal places) is ______________.
No, the answer is incorrect.
Score: 0
Accepted Answers:
(Type: Range) 6.1,6.4
Two identical resistance strain gages (gage factor = 2) have been mounted on a beam such that the gage 1 is on the tensile side of the beam and gage 2 is on the compressive side. The beam is made of steel (modulus of elasticity = 203 GPa). If the combined readout from both the gages is 390 μm per m, the stress acting at the longitudinal centre of the beam (correct to 2 decimal places) is ______________ MPa.
No, the answer is incorrect.
Score: 0
Accepted Answers:
(Type: Range) 39.0,40.0
Three identical strain gages are used to form a rectangular rosette. For a particular situation, all three gages indicate 100 μm per m of strain. Corresponding Poisson’s ratio is 0.3 and modulus of elasticity is 207 GPa. Then the magnitude of principal stress (correct to 2 decimal places) is ______________ MPa.
No, the answer is incorrect.
Score: 0
Accepted Answers:
(Type: Range) 29.0,30.0 HintHint
HintHint
HintHint
