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Consider the following statements: 1. The quenching of steel results in an increase in wear resistance, strength and hardness. 2. By the process of case hardening, hard wearing resistant surface is produced on mild steel. This is an effective method for low carbon steels because they cannot be hardened by the process of quenching. 3. When a metal is mixed with small atoms of non-metallic element in such a manner that invading atoms occupy interstitial positions in the metal lattice, an interstitial alloy results. What of the above statements are correct?
Combined carbon content in iron and steel is determined by treating the sample with dilute HNO3. So that combined carbon forms a soluble brown nitrated compound, the intensity of which is matched with that of a standard sample of similar composition treated under similar condition. The intensity of color produced is proportional to the carbon content of iron of steel sample. This method of combined carbon determination is called the
Which one of the following statements is incorrect ? (a) Every living organism takes C - 14 through carbon. (b) Every living being has the same proportion of carbon 14. (c) After death every living organ throws same percentage of carbon. (d) After 5568 yrs of death half of C - 14 will disappear - which is called as half life of Carbon - 14. (e) The method is used to get chronological evidence of archaeological remain. (f) This method was invented by F.W. Liby. (g) He got Nobel prize in physics for this work.
What does the term ‘carbon count’ means? 1. A measure of the amount of carbon dioxide you produce through your lifestyle every day. 2. A measure of the amount of carbon present on Earth. 3. A measure of the amount of carbon and carbon dioxide on Earth. Select the correct answer using the code given below.
The two surfaces of a 5 mm thick plate of carbon steel are maintained at a carbon concentration of 104 mol. m-3 on one side and zero concentration on the other side. Taking the diffusion coefficient of carbon in austenite to be 10-11 m-2.s-1, the steady state flux (mol.m-3.s-1) through the thickness of the steel is
Which of the statement/s is /are correct about the steel sector in India? a) As of 2019, India is the 3rd largest producer of steel. b) The top producer of steel in the world China, accounts for almost 50% of the steel production. c) India’s steel policy 2017 envisages a target of 300MT by 2030.
In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: Iron is able to take on two crystalline forms (allotropic forms), body-centered cubic, and face-centered cubic, depending on its temperature.  B: Iron is the base metal of steel. C: Because of steel's high tensile strength and low cost, this material is best used in buildings, infrastructure, tools, ships, trains, cars, machines, electrical appliances, and weapons. D: Steel is an alloy of iron and carbon and, sometimes, other elements such as chromium.
Which of the following statement(s) is/are CORRECT? I. Carbon compounds linked by only single bond are called saturated compounds. II. Carbon compounds having double or triple bonds are called unsaturated compounds. III. Saturated carbon compounds are more reactive than unsaturated carbon compounds.
500 kg of ore contained a certain amount of steel. After the first blast furnace process, 200 kg of slag containing 12.5% of steel was removed. The percentage of steel in the remaining ore was found to be 20% more than the percentage in the original ore. How many kg of steel were there in the original 500 kg ore?
Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?