Testing MCQ

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• What is meant by nomography for corrosion rates?
  ক

  Formula oriented method to find corrosion rate

  খ

  A rapid and ready conversion table for various corrosion rate units

  গ

  Schematic arrangement of corrosion data with the change in temperature and concentration

  ঘ

  A specific corrosion rate measurement method
• What is Nelson’s method regarding the presentation of corrosion data?
  ক

  A rapid and ready conversion table for various corrosion rate units

  খ

  Schematic arrangement of corrosion data with the change in temperature and concentration

  গ

  Formula oriented method to find corrosion rate

  ঘ

  A specific corrosion test regarding galvanic corrosion of stainless steel
• Which of the following corrosive environments that mostly results in polymeric dissolution?
  ক

  Strongly oxidizing environments

  খ

  Strong acids

  গ

  Strong alkalis

  ঘ

  Strong oxidizing environments, acids, and alkalis
• Which of the following is/are the effects of polymeric corrosion?
  ক

  Alteration of mechanical properties

  খ

  Cracks formation due to internal stress

  গ

  Loss of appearance

  ঘ

  Alteration of mechanical properties cracks formation due to internal stress and loss of appearance
• Which of the following is/are the causes for the bond rupturing in polymers?
  ক

  Chemical reaction (oxidation)

  খ

  Heat

  গ

  Radiation (sunlight)

  ঘ

  Chemical reaction, heat, and radiation
• Which of the following is/are the physicochemical processes that occur in polymers?
  ক

  Swelling

  খ

  Dissolution

  গ

  Bond rupture

  ঘ

  Swelling, dissolution and bond rupture
• The corrosion mechanism of polymeric and metallic materials are the same in all corrosive environments.
  ক

  True

  খ

  False
• Which of the following statement is/are correct regarding elastomers?
  ক

  It has high elastic properties

  খ

  It has weak intermolecular forces of attraction between molecules

  গ

  Rubber is a good example of an elastomer

  ঘ

  Elastomers have high elastic properties, weak intermolecular forces of attraction and rubber is a good example of an elastomer
• Which of the following is/are characteristics of plastics?
  ক

  High stiffness and strength

  খ

  Less thermal and electrical conductivity

  গ

  High corrosive resistance

  ঘ

  High stiffness and strength, less thermal and electrical conductivity and high corrosive resistant
• The polymer is a large and heavy molecular chain formed from the interaction of many monomeric units.
  ক

  True

  খ

  False
• Which of the following factors are considered to evaluate the paint test?
  ক

  Appearance of coating

  খ

  Presence and extent of corrosion

  গ

  Under film corrosion

  ঘ

  The appearance of coating, presence, and extent of corrosion and under film corrosion
• Which of the following method is the best approach to report the results of the pitting corrosion test?
  ক

  Reporting the number of pits per unit area

  খ

  Reporting maximum depth of a pit

  গ

  Reporting average depth of pits

  ঘ

  Reporting weight loss of a metal
• Which of the following is/are the corrosion testing’s for stainless steels?
  ক

  Warren test

  খ

  Streicher test

  গ

  Huey test

  ঘ

  Warren test, Streicher test and huey test
• Calculate the corrosion penetration rate of iron that corroding at an electrochemical corrosion rate of 1 microampere/sq. centimeters?
  ক

  0.212 mpy

  খ

  0.11 mpy

  গ

  0.46 mpy

  ঘ

  0.64 mpy
• Which of the following expression is used for electrochemical techniques to determine the corrosion penetration rate?
  ক

  Corrosion penetration rate = K (ai/D)

  খ

  Corrosion penetration rate = K (ai/nD)

  গ

  Corrosion penetration rate = (ai/nD)

  ঘ

  Corrosion penetration rate = (ai/nD)
• Which of the following units are used in terms of penetration of pits on a metal?
  ক

  Milligram sq. decimeter per day (MDD)

  খ

  Mils per year (MPY)

  গ

  Both MDD and MPY

  ঘ

  Neither MDD nor MPY
• Which of the following standard expression is used to measure the corrosion rate of a metal?
  ক

  Mils per year = W/DAT

  খ

  Mils per year = 534W/DAT

  গ

  Milligrams decimeter per day = 534W/DAT

  ঘ

  Milligrams decimeter per day = W/DAT
• Which of the following metals in which corrosion decreases with an increase in temperature in oxygenated corrosive solutions?
  ক

  Copper and its alloys

  খ

  Steels

  গ

  Cast irons

  ঘ

  Aluminum and its alloys
• Which of the following is/are the factors that affect corrosion testing?
  ক

  Temperature

  খ

  Dissolved oxygen

  গ

  Nature of metal

  ঘ

  Temperature, dissolved oxygen, and nature of metal
• The Corrodibility of the metal in a corrosion test may decrease or increase as a function of time.
  ক

  True

  খ

  False
• Which of the following is/are the cleaning methods after the exposure of specimen?
  ক

  Sandblasting

  খ

  Rubber-stopper

  গ

  Use of chemical and solvents

  ঘ

  Sandblasting, rubber-stopper and use of chemical and solvents
• What is liquid-line corrosion?
  ক

  Corrosion on the external surface of a fully-loaded water tank

  খ

  Corrosion at the interface of liquid and gases in a pipeline or tank

  গ

  Preferential corrosion of rivets over sheets in a storage container

  ঘ

  Corrosion on the external surface of a half-loaded storage tank
• Which of the following metals are resistant to dissolved oxygen?
  ক

  Stainless steels

  খ

  Aluminum and its alloys

  গ

  Stainless steels, aluminum, and its alloys

  ঘ

  Cooper and its alloys
• Which of the following metals is/are subjected to increased attack in the presence of oxygen?
  ক

  Aluminum and its alloys

  খ

  Copper and its alloys

  গ

  Cast iron and steel

  ঘ

  Copper and its alloys, cast iron and steels
• Which of the following is the formula to calculate the minimum testing time for a corrosion test?
  ক

  2000/milli meters per year

  খ

  2000/mils per year

  গ

  1000/millimeters per year

  ঘ

  1000/mils per year
• Which of the following methods is/are used for the surface preparation of a specimen?
  ক

  Polishing belts

  খ

  Emery papers

  গ

  Electrolytic polishing

  ঘ

  Polishing belts, emery papers, and electrolytic polishing
• A standard surface condition is also desirable and necessary to facilitate comparison with other results.
  ক

  True

  খ

  False
• Which of the following specifications of the specimen is must increase the reliability of a corrosion test?
  ক

  Chemical composition

  খ

  Fabrication history

  গ

  Metallurgical history

  ঘ

  Chemical composition, fabrication history, and metallurgical history
• Which of the following statement is/are true regarding the Huey test?
  ক

  Boiling 65% nitric acid is used as a corrosive solution

  খ

  Used to evaluate the heat treatment of steels

  গ

  Used to evaluate the heat treatment of stainless steels

  ঘ

  Boiling 65% nitric acid is used as a corrosive solution and used to evaluate the heat treatment of stainless steels
• What is the purpose of the salt-spray test?
  ক

  To evaluate painted surfaces

  খ

  To evaluate electroplated parts

  গ

  To evaluate painted surfaces and electroplated parts

  ঘ

  Neither to evaluate painted surfaces nor to evaluate electroplated parts