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A tensile test is performed on a round bar. After fracture it has been found that the diameter remains approximately same at fracture. The material under test was
- a)Mild steel
- b)Cast iron
- c)Wrought iron
- d)Copper
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A tensile test is performed on a round bar. After fracture it has been...
In Brittle materials under tension test undergoes brittle fracture i.e there failure plane is 90° to the axis of load and there is no elongation in the rod that’s why the diameter remains same before and after the load. Example: Cast Iron, concrete etc
But in case of ductile materials, material first elongate and then fail, their failure plane is 45° to the axis of the load. After failure cup-cone failure is seen. Example Mild steel, high tensile steel etc.
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A tensile test is performed on a round bar. After fracture it has been...
Explanation:
Tensile test is a type of mechanical test which is used to determine the mechanical properties of a material. In this test, a sample of the material is subjected to a gradually increasing tensile load until it reaches its ultimate tensile strength and fractures.
In this question, it has been mentioned that the diameter of the round bar remains approximately the same at fracture. This observation is an indication that the material under test was brittle. Brittle materials do not undergo significant plastic deformation before fracture and therefore, the change in diameter is negligible.
Out of the given options, cast iron is the most brittle material. This is because cast iron has a high carbon content, which makes it hard and brittle. Mild steel and wrought iron are both ductile materials, which means that they undergo significant plastic deformation before fracture. Copper is also a ductile material.
Therefore, the correct answer is option B - Cast iron.
Tensile test is a type of mechanical test which is used to determine the mechanical properties of a material. In this test, a sample of the material is subjected to a gradually increasing tensile load until it reaches its ultimate tensile strength and fractures.
In this question, it has been mentioned that the diameter of the round bar remains approximately the same at fracture. This observation is an indication that the material under test was brittle. Brittle materials do not undergo significant plastic deformation before fracture and therefore, the change in diameter is negligible.
Out of the given options, cast iron is the most brittle material. This is because cast iron has a high carbon content, which makes it hard and brittle. Mild steel and wrought iron are both ductile materials, which means that they undergo significant plastic deformation before fracture. Copper is also a ductile material.
Therefore, the correct answer is option B - Cast iron.
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A tensile test is performed on a round bar. After fracture it has been found that the diameter remains approximately same at fracture. The material under test wasa)Mild steelb)Cast ironc)Wrought irond)CopperCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A tensile test is performed on a round bar. After fracture it has been found that the diameter remains approximately same at fracture. The material under test wasa)Mild steelb)Cast ironc)Wrought irond)CopperCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A tensile test is performed on a round bar. After fracture it has been found that the diameter remains approximately same at fracture. The material under test wasa)Mild steelb)Cast ironc)Wrought irond)CopperCorrect answer is option 'B'. Can you explain this answer?.
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