Eight Forms MCQ

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• Which of the following is/are the preventions of hydrogen embrittlement?
  ক

  Baking of steels at low temperatures (200°F–300°F)

  খ

  Alloying with nickel or molybdenum reduces susceptibility

  গ

  Practicing proper welding with low hydrogen welding rods

  ঘ

  Baking of steels at low temperatures, alloying with nickel or molybdenum reduces susceptibility and practicing proper welding with low hydrogen welding rods.
• Which of the preventions is/are the preventions of hydrogen blistering?
  ক

  Use of clean steel instead of rimmed steel

  খ

  Applying metallic, inorganic and organic coatings

  গ

  Use of substituting alloys such as nickel-based alloys

  ঘ

  Use of clean steel instead of rimmed steel, applying metallic, inorganic and organic coatings and use of nickel-based alloys
• Which of the following type of corrosion in which corrosion occurs due to the presence of hydrogen sulfide?
  ক

  Hydrogen embrittlement

  খ

  Hydrogen blistering

  গ

  Sulfide stress corrosion

  ঘ

  Erosion corrosion
• Which of the following metal is highly susceptible to hydrogen embrittlement?
  ক

  Titanium

  খ

  Nickel

  গ

  Martensitic iron-base alloys

  ঘ

  Titanium and martensitic iron-base alloys
• Which of the following type of compounds act as an inhibitor for hydrogen-ion reduction?
  ক

  Sulfide ions

  খ

  Phosphorous compounds

  গ

  Arsenic compounds

  ঘ

  Sulfide ions, phosphorous and arsenic compounds
• Which of the following industries has a major concern on hydrogen blistering?
  ক

  Petroleum industry

  খ

  Chemical manufacturing industries

  গ

  Oil and natural gas refineries

  ঘ

  Oil and natural gas refineries, petroleum and chemical manufacturing industries
• Which of the following types of hydrogen damage processes are high-temperature processes?
  ক

  Hydrogen blistering and hydrogen attack

  খ

  Hydrogen attack and Decarburization

  গ

  Decarburization and hydrogen embrittlement

  ঘ

  Hydrogen attack only
• What is meant by hydrogen embrittlement?
  ক

  Entrapment of hydrogen molecules in the metal voids

  খ

  Formation of brittle metal hydrides

  গ

  Entrapment of metal hydrides in the metal voids

  ঘ

  Entrapment of hydrogen molecules and metal hydrides in the metal voids
• What is meant by hydrogen blistering?
  ক

  Entrapment of hydrogen molecules in the metal voids

  খ

  Formation of brittle metal hydrides

  গ

  Entrapment of metal hydrides in the metal voids

  ঘ

  Entrapment of hydrogen molecules and metal hydrides in the metal voids
• Which of the following is/are the types of hydrogen damage?
  ক

  Hydrogen blistering

  খ

  Hydrogen embrittlement

  গ

  Decarburization

  ঘ

  Hydrogen blistering, hydrogen embrittlement, and decarburization
• Hydrogen damage refers to the mechanical damage of a metal caused by the presence of or interaction of hydrogen.
  ক

  True

  খ

  False
• Which of the following is/are the preventions of corrosion fatigue?
  ক

  Use of high tensile strength metals

  খ

  Perform shot penning to induce compressive stresses

  গ

  Use coatings such as electrodeposited zinc, nickel

  ঘ

  Use of high tensile strength metals, perform shot penning to induce compressive stresses and use of coatings such as electrodeposited zinc, nickel
• Which of the following is/are the facts that indicate the reduction in fatigue resistance of metal?
  ক

  Corrosion pits act as stress raisers

  খ

  Corrosion pits act as initiate cracks

  গ

  Corrosion pits act as a stress raiser and initiate cracks

  ঘ

  Corrosion pits neither act as stress raiser nor initiate cracks
• Which of the following is/are the factors that influence corrosion fatigue?
  ক

  Type of metal

  খ

  Composition of corrosive solution

  গ

  Temperature

  ঘ

  Type of metal, corrosive solution composition, and temperature
• Define the fatigue limit of a metal.
  ক

  Stress below which metal will endure an infinite number of cycles without fracture

  খ

  Stress above which metal will endure an infinite number of cycles without fracture

  গ

  Stress at which metal will endure a less finite number of cycles

  ঘ

  Stress at which metal will endure a more finite number of cycles
• What is the nature of fatigue fracture?
  ক

  Brittle fracture

  খ

  Cup and cone fracture

  গ

  Tensile fracture

  ঘ

  Brittle and tensile fracture
• What is meant by fatigue?
  ক

  The tendency of a metal to fracture under static loading

  খ

  The tendency of a metal to fracture under repeated cyclic loading

  গ

  The tendency of a metal to fracture under non-repeating cyclic loading

  ঘ

  The tendency of a metal to fracture after heavy deformation
• Corrosion fatigue is defined as the reduction of fatigue resistance due to the presence of a corrosive medium.
  ক

  True

  খ

  False
• Which of the following is/are the preventions of stress-corrosion cracking?
  ক

  Lowering working stress below the threshold value

  খ

  Shot peening to produce residual compressive stresses

  গ

  Applying for cathodic protection

  ঘ

  Lowering working stress below the threshold value, shot peening to produce residual compressive stresses and applying for cathodic protection
• Which of the following stress-corrosion cracking mechanism is highly acceptable?
  ক

  Dissolution mechanics

  খ

  Mechanical mechanics

  গ

  Both dissolution and mechanical mechanics

  ঘ

  Hydrogen mechanics
• Which of the following type of stress has an important role in rupturing protective films during both the initiation and propagation of cracks?
  ক

  Tensile stress

  খ

  Compressive stress

  গ

  Shear stress

  ঘ

  Compressive and shear stress
• Which of the following is/are the metallurgical factors that affect stress-corrosion cracking?
  ক

  Chemical composition

  খ

  Distribution of precipitates

  গ

  Dislocation interactions

  ঘ

  Chemical composition, distribution of precipitates and dislocation interactions
• Which of the following is/are the environments that cause stress-corrosion cracking to titanium?
  ক

  Red fuming nitric acid

  খ

  Methanol-HCl

  গ

  Nitrogen tetroxide (N2O4)

  ঘ

  Red fuming nitric acid, methanol-HCl, and nitrogen tetroxide
• As stress-corrosion cracks penetrate the material, the cross-sectional area gets reduced under constant tensile load.
  ক

  False

  খ

  True
• Define Threshold stress regarding stress-corrosion cracking.
  ক

  The maximum stress at which the specimen ruptures

  খ

  The maximum stress required to prevent cracking

  গ

  The minimum stress required to prevent cracking

  ঘ

  The minimum stress at which cracking starts
• Which of the following alloy in which both intergranular and trans-granular cracking occurs?
  ক

  High-nickel alloys

  খ

  iron-chromium alloys

  গ

  Brasses

  ঘ

  High-nickel alloys, iron-chromium alloys, and brasses
• Which of the following is/are the most important variables that affect stress-corrosion cracking?
  ক

  Temperature

  খ

  Metal composition

  গ

  Type and amount of stress applied

  ঘ

  Temperature, metal composition, and type and amount of stress applied
• In which of the following environments that stainless steel will undergo stress-corrosion cracking?
  ক

  Chlorides

  খ

  Caustics

  গ

  Ammonia

  ঘ

  Chlorides and caustics
• What is meant by caustic embrittlement of steel?
  ক

  Failure of cold-worked rivets by a brittle fracture in the presence of ammonia

  খ

  Failure of cold-worked rivets by a brittle fracture in the presence of caustic soda

  গ

  Failure of cold-worked rivets by a brittle fracture in the presence of caustic soda and ammonia

  ঘ

  Failure of cold-worked rivets by the cup and cone fracture in the presence of caustic soda
• What is meant by season cracking of brass?
  ক

  Stress-corrosion cracking failure of brass cat ridge cases due to ammonia

  খ

  Stress-corrosion cracking failure of brass cat ridge cases due to caustic soda

  গ

  Stress-corrosion cracking failure of brass cat ridge cases due to caustic soda and ammonia

  ঘ

  Stress-corrosion cracking failure with brittle fracture