why do we physically mark gauge length on the samples before the test even though the machine is measuring displacement for us.(Tensile Testing Machine) What is the effect of rate of loading

What precisely is stress testing, and why is it advantageous to begin with?

The shear strength of a metal is commonly determined in which one of the following tests: Group of answer choices bending test compression test flexure test tensile test torsion test

What does a tensile test show?

Pls help ASAP

i. If you know that any strain gauge has a sensitivity towards temperature.In other words, any change in the temperature could also affect theresistance value. How can we get a correct reading from strain gaugesand get rid of the temperature effect?ii. In an AC LVDT system, measuring the output voltage alone gives anindication of the displacement from the center, but not the direction ofdisplacement. Explain why, and also explain a method for solving thisproblem.iii. In a vortex flow meter, there are many methods that could be used tomeasure the effect of vortices and measure the flow rate. Explain howvortices could occur in this flow meter, and explain three methods thatcould be used for measuring the effects of vortices in a vortex flowmeter.iv. Explain in details how can we use a capacitor to indicate the lever ofwater in a tank (use drawings and electrical diagram to elaborate on yourexplanation).Page 5 of 63v. Bimetallic strip could be used as a temperature detector. Explain…

39) A tensile test specimen has a gauge length=2in. and a diameter of 0.875in. Yielding occurs at a load of 35,500lbs. The corresponding gauge length = 2.0113in. (neglect the .2% yield point). The maximum load of 45,000lbs is reached at a gauge length of 2.543in.  If fracture occurs at a gauge length of 2.673in, determine the percent elongation at fracture (Round to the nearest whole %)

True or false ?? 

What is compression testing?

what is the Rockwell hardness test