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What is undercut defect in welding?

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Description : What is mass energy equivalence? Give one example. Define mass defect and binding energy.

Answer : Mass energy equivalence:-   The physical principle that a measured quantity of energy is equivalent to a measured quantity of mass. The equivalence is expressed by Einstein's equation E = mc ... of energy that must be supplied to a nucleus to completely separate its nuclear articles (nucleons)

Description : What are the different types of welding?

Description : What are the four basic welding positions?

Description : For arc welding current range is usually  (1) 10 to 15 A (2) 30 to 40 A (3) 50 to 100 A (4) 100 to 350 A

Answer : For arc welding current range is usually 100 to 350 A

Description : Spot welding is used for (1) Thin metal (3) Castings only (2) Rough and irregular surface (4) Thick sections

Answer : Spot welding is used for Thin metal

Description : Identify the correct combination of respective Electric arc welding and Electric resistance welding methods :  (A) Butt welding and Seam welding  (B) Hydrogen shielding and Projection welding  (C) Seam welding and Coated electrode welding  (D) Coated electrode welding and Hydrogen shielding

Answer : Identify the correct combination of respective Electric arc welding and Electric resistance welding methods :  (A) Butt welding and Seam welding  (B) Hydrogen shielding and Projection welding  ... Seam welding and Coated electrode welding  (D) Coated electrode welding and Hydrogen shielding

Description : The electrode rod used for welding uses a coating on it 

Answer : The electrode rod used for welding uses a coating on it  to give a vapour to serve as a shielding gas to protect the weld area from atmospheric contamination and to provide slag to protect the welded area

Description : The supply for arc welding is : 

Answer : The supply for arc welding is : Low voltage, high current ac or dc voltage

Description : Explain with sketch electron beam welding. 

Answer : Electron Beam Welding Process In EBW process, the heat is generated when the electron beam impinges on work piece. As the high velocity electron beam strikes the surfaces to be welded, their kinetic ... material that is directly in the path is melted which when solidifies form the joint. 

Description : State the four advantages of MIG welding.  

Answer : Four advantages of MIG welding: 1. High quality welds can be produced much faster. 2. Flux is not used there is no chance for the entrapment of slag in the weld metal resulting in high quality ... of metals and alloys. 5. Least expensive and highly economic. 6. Little or no post welds cleaning.

Description : List two special feature of welding transformer.

Answer : Special features of welding transformer: i) It is a step down transformer that reduces the source voltage to a voltage desired according to the demands of the welding process. ii) Having large primary turns and less ... V ii) Secondary voltage - 40 to 60 V iii) Secondary current - 200 to 600 A

Description : Welding Defects 

Answer : Welding Defects  Welding defects Explanation and causes 1. Cracks Cracks occur when localized stresses exceed the ultimate tensile strength of material. These stresses are developed due to shrinkage ... Too fast a travel, Bad welding technique, Too great a heat build-up.

Description : State the applications of TIG welding.

Answer : The applications of TIG welding are as follows: 1. Mostly used to weld aluminum and aluminum alloys. 2. It is used to weld stainless steel, carbon base alloy, copper base alloy, nickel base alloy etc. 3. It is used to welding dissimilar metals. 4. It is mostly used in aerospace industries.

Description : Describe with a neat diagram, the process of any one type of electric welding. 

Answer : Methods of electric welding :  1. Resistance welding  i Butt welding  ii Spot welding  iii Seam welding  iv Projection welding  2. Arc Welding  i Carbon arc welding  ii ... as copper, iron etc. The electric arc effectively concentrate heat on the surfaces it is desired to join.

Description : Compare between Resistance welding and Arc welding on any six points.

Answer : Sr.No Parameters Resistance Welding Arc Welding 1 Type of welding Plastic/Pressure/Non-fusion welding Fusion/Non pressure welding 2 Principle of heat developed Heat ... It is suitable for mass production It is suitable for heavy job, maintenance and repair work

Answer : Welding generator will have lap winding.

Answer : Arc blow is a welding defect which is encountered in arc welding using a.c. current.

Description : The commonly used gases in tungsten arc welding are 1.Hydrogen and oxygen 2.Hydrogen and organ 3.Hydrogen and helium 4.Helium and argon

Answer : The commonly used gases in tungsten arc welding are Helium and argon

Description : In which of the following welding methods, the molten metal is poured for joining the metals ?   (a) Gas welding (b) Thermit welding (c) TIG welding (d) Arc welding 

Answer : In which of the following welding methods, the molten metal is poured for joining the metals ?   (a) Gas welding (b) Thermit welding (c) TIG welding (d) Arc welding 

Description : Electric welding equipment works best at  A) Low voltage and low current B) Low Voltage and high current C) High voltage and low current D) High voltage and high current

Answer : Electric welding equipment works best at Low Voltage and high current 

Description : What type of defect causes F -centers in a crystal ?  (a) Stoichiometric defect (b) Metal excess defect due to anion vacancies (c) Metal excess defect due to extra cations (d) Frenkel defect

Answer : Metal excess defect due to anion vacancies

Description : Occlusion of the lower nasal branch of the central retinal artery results in one of the following field defects: a. Lower nasal sector field defect b. Upper nasal sector field defect c. Upper temporal field defect d. Lower temporal sector field defect

Answer : ANSWER: C  

Description : Which one of the following is not a key process area in CMM level 5 ? (A) Defect prevention (B) Process change management (C) Software product engineering (D) Technology change management

Answer : (C) Software product engineering

Description : Which one of the following is not a definition of error ? (A) It refers to the discrepancy between a computed, observed or measured value and the true, specified or theoretically correct value. (B) It ... to fail. (D) It refers to human action that results in software containing a defect or fault. 

Answer : (C) It refers to a condition that causes a system to fail.

Description : Refracting telescopes suffer from an optical defect called chromatic aberration. a. True b. False

Answer : a. True  

Description : Finding Defect is not a major goal of Acceptance Testing. a) True b) False

Answer : ANSWER: True

Description : Papilloedema has all the following characteristics except: a. Marked loss of vision b. Blurring of disc margins c. Hyperemia of disc d. Field defect 

Answer : ANSWER: A  

Description : A teacher has serious defect is he/she Options: A) is physically handicapped B) belongs to low socio-economic status C) has weak personality D) has immature mental development

Answer : D) has immature mental development

Description : Software safety is a ................... activity that focuses on the identification and assessment of potential hazards that may affect software negatively and cause an entire ... monitoring and management (B) Software quality assurance (C) Software cost estimation (D) Defect removal efficiency

Answer : (B) Software quality assurance

Description : Which one of the following lenses should be used to correct the defect of astigmatism ? (1) Cylindrical lens (2) Concave lens (3) Convex lens (4) Bifocal lens

Answer : Cylindrical lens

Description : Define Defect.

Answer : It refers to the several troubles with the software product, with its external behavior or its internal features. OR A defect is an error in coding that causes a program to fail or to produce incorrect /unexpected results.

Description : Give meaning of the term defect. State effects of it. Also give classification of it and methods to eliminate them.

Answer : Ans: Defect - Failure in a general sense can be regarded as a defect   Effects of Defect -Defect results in the reduction of speed or load capacity of the locomotive or which detables the ... taken by manufacturer Defects(2) and (3) can be minimised by restoring to the ideal maintenance practice

Description : A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as 1. Shift 2. Sand wash 3. Swell 4. Scab

Answer : A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as Sand wash

Answer : If a single phase induction motor runs slower than normal, the most likely defect is worn bearings.

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Description : What is the main purpose of electroplating?

Answer : Protecting  reactive  metals  from  corrosion.

Description : What are the applications of electroplating?

Description : What are the industrial application of electrolysis?

Description : What is vertical sag?

Description : What is a conveyor motor?

Answer : Motors used to run conveyor belts.

Description : What is the traction system?

Description : What is the difference between an insulator and a dielectric?

Answer : Dielectric is the another name for insulator.

Description : What is meant by resistance heating?

Description : What is meant by dielectric heating?

Description : Acetylene is commonly used in a gas welding torch. Give the molecular formula for acetylene. 

Answer : ANSWER: C2H2 or HC2H or H2C2

Description : Describe in brief the equipments required for oxy-acetylene welding.

Answer : The following equipments are required for oxy-acetylene welding. 1. Welding torch or Blowpipe: It is the tool for mixing two gases in the desired volumes and burning the mixture at the end of a ... particularly when the oxides of the base metal have a higher melting point than the metal itself.

Description : Explain any two types of resistance welding processes in detail.

Answer : 1.Resistance Spot welding: Spot welding is employed to join overlapping strips, sheets or plates of metal at small areas. The pieces are assembled between two electrodes, which must possess high electrical ... small parts. Butt Welding provides joining with no loss of the welded materials.   

Description : List various types of flames used in gas welding. 

Answer : Answer: 1. Neutral Flame 2. Oxidizing Flame 3. Carburizing Flame 

Description : List types of welding flames used in Oxy-acetylene welding. Write their characteristics and applications.

Answer : Types of Flames: Characteristics Applications. 1)Neutral Flame: When oxygen and acetylene are supplied to the torch in nearly equal volumes, a neutral flame is produced. It has two ... cone of whitish colour. 3) Bluish outer cone High Carbon Steel, non - ferrous alloys,

Description : Explain with neat sketch method of welding used in manufacturing sheet metal roofs and doors of automobiles. 

Answer : Method of Welding Used in Manufacturing Sheet Metal Roofs and doors of automobiles: MIG Welding: Gas-metal-arc welding is a gas shielded metal arc welding process which uses the high ... mixtures) which will not combine with metal. Carbon dioxide is most commonly used as it inexpensive.

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