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A tensile specimen was deformed to a true strain of 0.405. The change in the gauge length was 5 mm. The final gauge length of the specimen, in mm, is: (-Gate metallurgical engineering 2014)1 AnswerA tensile test is performed on a metallic specimen of diameter 8 mm and gauge length 50 mm. When the tensile load P reaches a value of 20 kN, the distance between the gauge marks increases by 0.09 mm. If the sample remains within the elastic limit, the modulus of elasticity (in GPa) of the test metal is………..[up to two decimal places]0 AnswerA rod of length 20mm is stretched to make a rod of length 40 mm. Subsequently, it is compressed to make a rod of final length 10 mm. Consider the longitudinal tensile strain as positive and compressive strain as negative. The total true longitudinal strain in the rod is _______1 AnswerA bar is compressed to half of its original length. The magnitude of true strain produced in the deformed bar is (Gate 2018 Mechanical engineering)1 AnswerWhich of the gauges is used in the hilly areas?1 AnswerConsider the stress-strain curve for an ideal elastic-plastic strain hardening metal as shown in the figure. The metal was loaded in uniaxial tension starting from O. Upon loading, the stress-strain curve passes through initial yield point at P, and then strain hardens to point Q, where the loading was stopped. From point Q, the specimen was unloaded to point R, where the stress is zero. If the same specimen is reloaded in tension from point R, the value of stress at which the material yields again is _________ MPa.0 AnswerWhich one of the following signals from a specimen is used in a scanning electron microscope to get quantitative elemental analysis? (-Gate metallurgical engineering 2014)1 AnswerDerive the gauge factor for Strain gauge.1 AnswerIf AIV for specimen A is 25 and that for specimen B is 45 Which one is better for surface of a pavement Justify it?1 AnswerAgricultural Engineering Gate: The elevations of pressure gauge and porous cup of the tensiometer installed in unsaturated zone are 145.8 m and 144.2 m, respectively. Pressure measured at the gauge is -19.62×103 N m-2 . The specific weight of water is 9810 N m-3 . The estimated pressure at the porous cup is ________ N m-2 .0 AnswerA broad gauge railway line passes through a horizontal curved section (radius = 875 m) of length 200 m. The allowable speed on this portion is 100 km/h. For calculating the cant, consider the gauge as centre-to-centre distance between the rail heads, equal to 1750 mm.0 AnswerT he ideal plastic work involved in extruding a cylindrical billet of length 100 mm, from an initial diameter of 20 mm to a final diameter of 16 mm is __________ (in J to one decimal place).1 AnswerExplain Strain gauge.1 AnswerWhat is the theoretical requirement of air (in m3 at STP) for the complete combustion of 100 m3 (at STP) of a fuel consisting of pure CH4? Assume that air contains 21 vol.% of oxygen. _____. (-Gate metallurgical engineering 2014)1 AnswerWhich one of the following refers to the ability of a material to absorb energy when deformed elastically? (-GATE metallurgical engineering 2014)1 AnswerIf a line is inclined to Vertical Plane and parallel to Horizontal Plane, then which of the following statements is always correct ?0 AnswerWhen a specimen of M25 concrete is loaded to a stress level of 12.5 MPa, a strain of 500×106 is recorded. If this load is allowed to stand for a long time, the strain increases to 1000×106 .0 AnswerA steel rod was subjected to a fluctuating stress cycle that varied between a maximum of 400 MPa in tension to a minimum of 300 MPa in compression. What is the stress amplitude, in MPa?______. (-Gate metallurgical engineering 2014)1 AnswerA body starts yielding when it is subjected to a stress state with principal stresses of 250 MPa, 50 MPa and −50 MPa. What is the yield strength of the material, in MPa, if Tresca yield criterion is obeyed? (-Gate metallurgical engineering 2014)1 AnswerThe percent voids in mineral aggreg ate (VMA) and percent air voids (V v ) in a compacted cylindrical bituminous mix specimen are 15 and 4. 5respectively. The percent voids filled with bitumen (VFB) for this specimen is:1 Answer
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