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Question: In the acid Bessemer process, the hot metal should have the following com-positon. [A]. S < 0.05% and P < 0.05%. [B]. S < 0.05% and P < 1.5%. [C]. S < 0.05% and P > 1.5%. [D]. S > 1.5% and P < 0.05%. Answer: Option A Explanation: No answer description available for…
Question: Brazing filler metal used for joining steel plates [A]. melts below the melting points of base metals. [B]. melts below 300°C. [C]. is copper phosphorous alloy. [D]. is copper. Answer: Option A Explanation: No answer description available for this question.
Question: Cold cracking in the heat affected zone of a high strength steel weld can take place because of the [A]. retained austenite. [B]. martensite formation. [C]. relatively high sulphur content in the base metal. [D]. sufficient hydrogen present in the welding arc. Answer: Option B Explanation: No answer description available for this question.
Question: Internal cracks in drawn bars are due to [A]. secondary tensile stresses. [B]. temperature gradient in the work piece. [C]. heated dies and grips. [D]. internal compressive residual stress. Answer: Option A Explanation: No answer description available for this question.
Question: In hot working, dynamic recovery occurs in [A]. metals of low stacking fault energy. [B]. metals of high stacking fault energy e.g. α-iron. [C]. single crystal of Ni-based superalloys. [D]. none of these. Answer: Option B Explanation: No answer description available for this question.
Question: Fine grain size in metallic material will [A]. increase the yield strength. [B]. increase the creep strength. [C]. increase the fatigue strength. [D]. decrease the impact strength. Answer: Option C Explanation: No answer description available for this question.
Question: Increasing the carbon content of steel [A]. reduces the upper shelf energy. [B]. increasing the ductility transition temperature. [C]. decreases brittleness. [D]. decreases hardness. Answer: Option B Explanation: No answer description available for this question.
Question: In sheet metal forming, stretcher strains occur in [A]. duralumin sheets. [B]. low carbon steel sheets. [C]. austenitic stainless steel sheets . [D]. Ni-base alloy sheets. Answer: Option A Explanation: No answer description available for this question.
Question: Pellets are not as popular a burden as sinter in the iron blast furnace, because of their [A]. shape. [B]. swelling tendency. [C]. poor reducibility. [D]. low mechanical strength. Answer: Option B Explanation: No answer description available for this question.
Question: In TIG welding, thoriated tungsten electrodes are used, because it [A]. has higher current carraying capacity. [B]. has better electron emissivity. [C]. is stronger than ordinary tungsten. [D]. is easy to prepare. Answer: Option B Explanation: No answer description available for this question.