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Which of the following devices is used for the measurement of angular deformation in torsion test?

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in Casting-Forming-Welding I by (687k points)
Which of the following devices is used for the measurement of angular deformation in torsion test?

(a) Tachometer

(b) Extensometer

(c) Troptometer

(d) Slip gauges

This question was posed to me in an interview for internship.

I need to ask this question from Testing of Mechanical Properties topic in portion Inspection Testing in Foundries of Casting-Forming-Welding I

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The correct option is (c) Troptometer

Easy explanation: A device known as troptometer is basically used to measure angular deformation in torsion test. This device mainly consists of two collars which are clamped to the specimen at the desired gauge length, in which one collar is equipped with a pointer and the other with a graduated scale.

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