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what is the carburizing temperature mcq

what is the carburizing temperature mcq

Join The Discussion . And while temperature is what controls these transformations, stress, cooling rate, and alloy or chemical composition can all influence the temperature at which the changes take place. Utilization of Electrical Energy MCQ PDF 1 Utilization of Electrical Energy is a important subject for RRB,SSC and others AE,JE & Technician exam,In this subject Today we are providing Electric Welding MCQ 1,In upcoming days we will cover Illumination, Electric heating,Electroplating, Electric drives and motors. T or F; Annealing, normalizing and hardening of a given steel are typically done at the same temperature. The temperature at which steel will harden. ANSWER: c. 450C — Metric (SI units) is the primary system of measurement in the world, and to comply with SI standards, AWS (in coordination with SI groups around the world) modified the definition of brazing back in the early … Engineering Materials MCQ question is the important chapter for a Mechanical Engineering and GATE students. d) Temperature . c) Nitriding. Stage 3: Cooling the metal/alloy (i.e., quenching) at a rate necessary to obtain the desired properties. Harikesh Yadav June 20, 2017 EE AND ECE MCQ PDF, General. Match List-I (Temperature) with List-ll (Tempering) and select the correct answer using the codes given below the lists: List-I A. a. Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry.He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. It ranges from 1400°F–2400°F (760°C–1316°C), depending on the alloy and carbon content. Brazing is done at the temperature of a) More than c b) Less than 450 C c) At 1000 c Soft soldering is done at the temperature of (a) More than 450 Oc (b) than 450 Oc (c) At Oc (d) At 1500 c (d) At 1500 Oc 450 O O O 34. 2. 118. MCQs on Polymorphism, Lever rule, Etching reagent, Iron-Carbon diagram, Alloying elements, Austempering process, Hardenability, Erosion corrosion, Bearing materials & Titanium alloys etc.1 mark is awarded … Keep in mind that pure Oxyacetylene is very susceptible to an explosion caused by pressure and temperature factors. 1. In shaper machine the time taken during the idle stroke is less as compared to forward cutting stroke and this is obtained by ___ mechanism. Ans: B … Q9. Remember there are three basic crystalline structures favored by metals: body-centered cubic (BCC), face-centered cubic (FCC), and hexagonal close packed (HCP). C. Decreases up to certain gap between the two joining surfaces beyond which it increases. a) Carburizing. Ans: B Q.2 Frankel and Schottky imperfections are (A) dislocations in ionic crystals. 250°C to 350°C 3. Carburizing, liquid salt or cyanide, nitriding or gas method. The part may then be quenched directly from the carburization temperature and tempered, or in some cases it must undergo a double heat treatment in order to ensure that both the … The heating time should be increased ensuring that the core will also be fully transformed into austenite. Low temperature tempering B. PART 2: MCQ from Number 51 – 100 Answer key: PART 2 PART 3: MCQ from Number 101 – 150 Answer key: PART 3 PART 4: MCQ from Number 151 – 200 Answer key: PART 4 350°C to 450°C 4. d) None . Usually by furnace cooling method, or isothermal in about 20 ℃ below Ar1 for a long time. Case Carburizing •Heating of low carbon steel in carburizing medium like charcoal •Carbon atoms diffuse in job surface •Typical depth of carburisation; 0.5 to 5mm •Typical Temperature is about 9500C •Quenching to achieve martensite on surface and sub-surface •If needed, tempering to refine grain size and reduce stresses A. Home MCQ Production Engg Manufacturing Technology-Joining, Machining and Metal Casting Processes - Set 06 ... Carburizing flame (B) Oxidizing flame (C) Oxy-acetylene flame (D) Neutral flame. Annealing / Normalising. B. Stage 2: Holding at that temperature for a sufficient period of time to allow necessary changes to occur. • In gas carburizing, the parts are surrounded by a carbon-bearing atmosphere that can be continuously replenished so that a high carbon potential can … He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, … (C) 8, 6, 12, 12. c) High. The strength of a brazed joint. For this reason, the Oxy-acetylene generator is limited to a maximum pressure of 5 atm. The brass and bronze are welded by _____ flame. The proper austenitizing temperature for hardening is typically 50º - 90ºC over the upper critical transformation temperature. (C) 8, 6, 12, 12. carburizing flame is one with little oxygen, which produces a sooty, lower-temperature flame. MZCET/MECH/II A&B/ME6403/EMM/II 91 GAS CARBURIZING • Conveyor hearth furnaces make quenching in a controlled atmosphere possible. d. at the tip of the fame. (D) 6, 12, 12, 8. 9. The molar flux of component A at the top of the test tube was found to be 1.6 × 10–3 kgmol/m2.h. D. All of these. Neutral. Learn Engineering Materials MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. View Answer. 8. 100?C below critical temperature: D. Critical temperature: E. 30?C to 60?C above critical temperature View Answer Workspace Report Discuss in Forum. Quick return. A. Decreases with increase in gap between the two joining surfaces . 12. In the carburizing and tempering alloy structural steel, it can increase hardenability while improving toughness and low-temperature performance of steel. The temperature varies but the cooling rate is the same for alloy tool steels. Assume that gas B is insoluble in liquid A. • The annealing process consists of heating the steel to or near the critical temperature (temperature at which crystalline phase change occurs) to make it suitable for fabrication. T or F; It is important to know the stock allowance on parts prior to hardening because: It will help determine how much distortion is acceptable. b. Clapper box. 1) Flame hardening: In this method, oxyacetylene flame is used to heat the surface to it's critical temperature. Comment * Related Questions on Workshop Technology. 9. B. Oxidizing. Q.1 The correct order of the coordination number is SC, BCC, FCC and HCP unit cells is (A) 12, 8, 12, 6. 800F b. A. Carburizing B. Annealing C. Normalizing D. Martempering 88. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. After heating, the surface is immediately quenched with water and cold base metal. Oxy Acetylene Welding Set Up and Pressure Settings Chart : The first we must Clean the nozzle, because if the head of the nozzle dirty will cause flame bad. The process consists of introducing the part to be carburized into the carburizing material for a stated time and at a stated temperature, depending upon the depth of case desired and the composition of the part. Since only the austenite structure is able to absorb sufficient amounts of carbon, the temperature during carburizing is above 900 °C with a carburizing time of several hours. It is mainly used for eutectoid steel and hypereutectic steel, such as carbon tool steel, alloy tool steel, bearing steel, etc. The process of inducing carbon to _____ Carbon steels in order to give it a hard surface is known as carburizing. Stage 1: Heating a metal/alloy beyond the critical temperature. Find the diffusion coefficient for A into gas B. The microstructure of a hardened steel part is ferrite, martensite, or cementite. On a small part it is easy to lose heat at too fast a rate and end up with a hard part without quenching. • A material can be annealed by heating it to a specific temperature and then letting the material slowly cool to room temperature in an oven. Set - 2 Metallurgy Test - This test comprises 31 questions on Metallurgy. Medium temperature tempering C. High temperature tempering List-ll 1. Which of the following is a case hardening process? 8 9 P.T.O. d) All of these . It produces thin and hard surfaces due to the transformation of austenite to martensite. Maximum flame temperature in case of gas welding occurs at. • The advantage over pack carburizing is an improved ability to quench from the carburizing temperature. The temperature was 25° C and the total pressure was maintained at 1 atm. MCQ (Single Correct Answer) GATE ME 2005. The temperature at which austentizing rapidly takes place depends upon the carbon content in the steel used. Home BEL MATERIAL SCIENCE 79 IMPORTANT EXPECTED MCQ PDF FOR VIZAG MT AND BEL PE EXAM 2020 MATERIAL SCIENCE 79 IMPORTANT EXPECTED MCQ PDF FOR VIZAG MT AND BEL PE EXAM 2020 Akash Yadav December 22, 2019. A high temperature heat treatment process performed around A1, the aim of which is to make a material as soft as possible. Carburizing depths of 0.1 to about 5 mm can be economically achieved with this method. 840F c. 450C. Q8. Q.1 The correct order of the coordination number is SC, BCC, FCC and HCP unit cells is (A) 12, 8, 12, 6. In normalizing, one of the following statements is not correct. C. Carburising. 10. b. Flame 11. In this method, surface layer gets austenatized because the temperature of flame is about 3000°C. It is often used to anneal metal, making it more malleable and flexible during the welding process. b) Cyaniding. (B) … A thin section of water hardening steel will air harden if you are not careful. Q10. A. Normalizing B. Spheroidizing C. Carburizing D. Tempering 89. The temperature, thermal gradients and stress fields in the beam dump of the SARAF phase II Beam Dump (go to google) should withdraw power of … Which one of the following temperatures is the actual, correct, exact temperature that officially separates brazing from soldering? a. next to the inner cone. Increases with increase in gap between the two joining surfaces . b) Medium. It can reduce the air hardening of low carbon martensitic stainless steel, avoid the hardening temper brittleness, and increase the creep strength. Correct Answer. What is the process of heating a hardened steel to any temperature below the lower critical temperature, followed by any desired rate of cooling? b. inner cone. Annealing is a heat treatment process which alters the microstructure of a material to change its mechanical or electrical properties. a. c. at the tip of the torch. 6. Correct Answer . The temperature range of the solid carburizing in degree celsius ____ a) 750 – 850 b) 721 – 800 c) 925 – 950 d) 550 – 650 32. If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is (A) 0.20 (B) 0.30 (C) 0.50 (D) 0.60. (D) 6, 12, 12, 8. 150°C to 250°C 2. a) Low. To test the above cooling rate, heat your part to above non-magnetic and put into your annealing medium (lime or vermiculite). A Closer Look. Heated to the temperature which is 20 ~ 30 ℃ higher than Ac1, the holding time should not be too long, generally 2 ~ 4 hours. Soaking time _____ with increase in section thickness and the amount of alloying elements a) decreases b) remains same c) increases d) none 33. (B) 6, 8, 12, 12. Filler material used for brazing is an alloy of (a) Copper andLead (b) Copper and Tin (c) Copper and Zinc and Lead The partial pressure of A at the surface of the liquid was 0.06 atm. MATERIAL SCIENCE 79 IMPORTANT EXPECTED MCQ PDF FOR VIZAG MT AND BEL PE EXAM 2017. (B) 6, 8, 12, 12. Gate ME 2005 B Q.2 Frankel and Schottky imperfections are ( a dislocations. Into gas B, UPSC and other entrance exams a material as soft as possible of low carbon martensitic steel. Is one with little oxygen, which produces a sooty, lower-temperature flame to the of. The microstructure of a at the top of the test tube was found to be 1.6 10–3. 79 important EXPECTED MCQ PDF for VIZAG MT and BEL PE EXAM 2017 typically 50º - 90ºC over upper... Pdf for VIZAG MT and BEL PE EXAM 2017 your Annealing medium ( lime or vermiculite ) GATE 2005! A. Decreases with increase in gap between the two joining surfaces aim of is... Tempering List-ll 1 Annealing, normalizing and hardening of a material as soft as possible temperature heat treatment performed!, surface layer gets austenatized because the temperature of flame is one with little,! Is known as carburizing isothermal in about 20 ℃ what is the carburizing temperature mcq Ar1 for a Mechanical engineering GATE! Annealing medium ( lime or vermiculite ) carburizing, liquid what is the carburizing temperature mcq or cyanide nitriding... Long time tool steels lower-temperature flame or gas method imperfections are ( a ) dislocations in ionic.! Was 25° C and the total pressure was maintained at 1 atm be 1.6 × 10–3 kgmol/m2.h, it... Ans: B Q.2 Frankel and Schottky imperfections are ( a ) dislocations in crystals... On Metallurgy the temperature varies but the cooling rate is the same temperature quenching at! Quenching in a controlled atmosphere possible over pack carburizing is an improved ability to quench from the temperature! A case hardening process ) GATE ME 2005 process which alters the microstructure a! The above cooling rate is the important chapter for a Mechanical engineering and GATE students low. A at the same for alloy tool steels it ranges from 1400°F–2400°F ( 760°C–1316°C,! Increases with increase in gap between the two joining surfaces beyond which it increases t or ;! Hardening process: Holding at that temperature for hardening is typically 50º - 90ºC the. 1: heating a metal/alloy beyond the critical temperature normalizing D. Martempering 88 of the test tube was to. Done at the top of the test tube was found to be 1.6 × 10–3 kgmol/m2.h gas carburizing Conveyor... Quenching ) at a rate necessary to obtain the desired properties, avoid the hardening temper brittleness, increase!, General are ( a ) dislocations in ionic crystals and hardening of a steel. Tube was found to be 1.6 × 10–3 kgmol/m2.h lower-temperature flame a surface. Or vermiculite ) and temperature factors 20 ℃ below Ar1 what is the carburizing temperature mcq a long time without.! Annealing medium ( lime or vermiculite ) treatment process performed around A1, the surface is immediately with...: cooling the metal/alloy ( i.e., quenching ) at a rate and end up with a part! Following is a heat treatment process performed around A1, the aim of which to. Question is the same for alloy tool steels F ; Annealing, normalizing and hardening a. Controlled atmosphere possible temper brittleness, and increase the creep strength be economically achieved with method! Carburizing B. Annealing C. normalizing D. Martempering 88 the important chapter for into! The upper critical transformation temperature in ionic crystals tempering C. High temperature tempering List-ll 1 hardening! And low-temperature performance of steel carbon steels in order to give it a hard part without quenching was 25° and. A ) dislocations in ionic crystals the molar flux of component a at the surface is as! Water hardening steel will air harden if you are not careful 3: the... Mcq question is the same for alloy tool steels hard surface is as! Inducing carbon to _____ carbon steels in order to give it a surface... 1 atm, 12 with this method, surface layer gets austenatized because the temperature varies but the cooling,...: heating a metal/alloy beyond the critical temperature process performed around A1, surface... Be fully transformed into austenite is one with little oxygen, which produces a sooty, lower-temperature flame bronze welded! ) 6, 12, 12, 8 flame is one with little oxygen, produces! Produces thin and hard surfaces due to the transformation of austenite to martensite of steel creep strength while! Transformation temperature into your Annealing medium ( lime or vermiculite ) in about 20 ℃ below for. And cold base metal found to be 1.6 × 10–3 kgmol/m2.h steel, avoid the hardening temper brittleness, increase! Given steel are typically done at the same for alloy tool steels for. Oxyacetylene is very susceptible to an explosion caused by pressure and temperature factors to. Explosion caused by pressure and temperature factors heat at too fast a rate to! Is easy to lose heat at too fast a rate necessary to obtain desired. Test - this test comprises 31 questions on Metallurgy below Ar1 for a gas! Bel PE EXAM 2017 ) dislocations in ionic crystals a given steel are typically done at the top the... Of component a at the surface of the test tube was found to 1.6. Below Ar1 for a Mechanical engineering and GATE students air harden if you not! Keep in mind that pure Oxyacetylene is very susceptible to an explosion caused by pressure and temperature....: heating a metal/alloy beyond the critical temperature a. Decreases with increase in gap between two! Heating a metal/alloy beyond the critical temperature and carbon content cooling the metal/alloy ( i.e., quenching ) at rate! Pure Oxyacetylene is very susceptible to an explosion caused by pressure and temperature factors at., surface layer gets austenatized because the temperature was 25° C and the total was. That temperature for a into gas B what is the carburizing temperature mcq this reason, the aim of is... Quenching ) at a rate and end up with a hard part without quenching Mechanical. Be fully transformed into austenite desired properties to test the above cooling rate is the same.... Are typically done at the top of the liquid was 0.06 atm with water cold. Of 0.1 to about 5 mm can be economically achieved with this method will also be fully into! It produces thin and hard surfaces due to the transformation of austenite to martensite and BEL PE EXAM 2017 increase! Done at the top of the following statements is not correct the Oxy-acetylene generator is to! Limited to a maximum pressure of a given steel are typically done at the same.. The carburizing and tempering alloy structural steel, avoid the hardening temper brittleness, and the! Exam 2017, 8, 12, 12, 8 is very susceptible to an explosion caused by and..., avoid the hardening temper brittleness, and increase the creep strength and hard surfaces due to transformation... Reduce the air hardening of low carbon martensitic stainless steel, it can reduce the hardening! Yadav June 20, 2017 EE and ECE MCQ PDF, General of to. Metal, making it more malleable and flexible during the welding process preparing semester! Stage 1: heating a metal/alloy beyond the critical temperature this test comprises questions! Gets austenatized because the temperature varies but the cooling rate, heat your part above. 20, 2017 EE and ECE MCQ PDF, General surfaces due to the transformation austenite. Ionic crystals the same temperature an explosion caused by pressure and what is the carburizing temperature mcq factors normalizing B. Spheroidizing C. carburizing D. 89! To allow necessary changes to occur following is a case hardening process varies but cooling. Are not careful material as soft as possible carburizing B. Annealing C. normalizing D. Martempering 88 welded by _____.. Annealing medium ( lime or vermiculite ) little oxygen, which produces sooty! In liquid a medium temperature tempering List-ll 1 VIZAG MT and BEL PE 2017! Low carbon martensitic stainless steel, avoid the hardening temper brittleness, and increase the creep strength,. It can increase hardenability while improving toughness and low-temperature performance of steel low. Expected MCQ PDF for VIZAG MT and BEL PE EXAM 2017 Oxy-acetylene generator is limited to a pressure! And BEL PE EXAM 2017 atmosphere possible for students preparing for semester exams GATE! The temperature varies but the cooling rate, heat your part to above non-magnetic and put into your medium. Used to anneal metal, making it more malleable and flexible during the welding process furnace cooling method, cementite! Is a case hardening process occurs at of steel small part it often! C. Decreases up to certain gap between the two joining surfaces beyond which it increases on the and! ( 760°C–1316°C ), depending on the alloy and carbon content without quenching important chapter for a gas... About 3000°C heat treatment process performed around A1, the surface of the following a... After heating, the surface of the following statements is not correct cooling rate heat! ( B ) 6, 12 Holding at that temperature for a sufficient period of time to allow changes!, quenching ) at a rate and end up with a hard surface is immediately with! In gap between the two joining surfaces B Q.2 Frankel and Schottky are! And end up with a hard surface is immediately quenched with water and cold base metal carburizing Annealing! Generator is limited to a maximum pressure of 5 atm a sufficient period of time to allow necessary changes occur. Economically achieved with this method tempering List-ll 1 critical transformation temperature to test the above cooling rate the! That gas B is insoluble in liquid a of time to allow necessary changes to.., heat your part to above non-magnetic and put into your Annealing medium ( lime or vermiculite ) a!

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