Galvanic Corrosion MCQ

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• Which of the following chemical is responsible for the stains on silver?
  ক

  Hydrogen peroxide

  খ

  Hydrogen sulfide

  গ

  Sulfur dioxide

  ঘ

  Sulfur trioxide
• Which of the following are the limitations of the EMF series?
  ক

  Available for metals and alloys

  খ

  Limited to pure metals only

  গ

  Measured only at standard conditions

  ঘ

  Limited to pure metals and measured only at standard conditions
• Which of the following is an example of cathodic protection?
  ক

  Electroplating of steel

  খ

  Galvanization of steel

  গ

  Magnesium connected to steel pipes

  ঘ

  Electroplating of steel, galvanization of steel and magnesium connected to steel
• Which of the following principle is utilized in the concept of cathodic protection?
  ক

  Principle of galvanic corrosion

  খ

  Principle of crevice corrosion

  গ

  Principle of pitting corrosion

  ঘ

  Principle of selective leaching
• Which of the following is/are the preventions of galvanic corrosion?
  ক

  Avoid the unfavorable area effect of a small anode and large cathode

  খ

  Select the close combination of metals in galvanic series

  গ

  Select the far combination of metals in galvanic series

  ঘ

  Avoid the unfavorable area effect of a small anode and large cathode and select the close combination of metals in galvanic series
• Define area effect regarding galvanic corrosion?
  ক

  cathodic area * anodic area

  খ

  anodic area/cathodic area

  গ

  cathodic area/anodic area

  ঘ

  cathodic area + anodic area
• Define the distance effect regarding galvanic corrosion?
  ক

  Corrosion occurs only at the junction of two metals

  খ

  Corrosion occurs only at the edges of two metals

  গ

  Corrosion decreases with increase in distance from the junction

  ঘ

  Corrosion increases with increase in distance from the junction
• Corrosion is greater near the seashore than in a dry rural atmosphere.
  ক

  True

  খ

  False
• The reason for the noble nature of titanium is that it cathodically polarizes readily in seawater.
  ক

  False

  খ

  True
• Which of the following is the most corrosion-resistant metal at room temperature?
  ক

  Titanium

  খ

  Platinum

  গ

  Gold

  ঘ

  Tantalum
• The potential generated by two dissimilar metal combinations can change with time.
  ক

  True

  খ

  False
• Which of the following metal combination has a minimum galvanic effect?
  ক

  Monel and copper

  খ

  Inconel (passive) and Inconel (active)

  গ

  18-8 stainless steel (active) and 18-8 stainless steel (passive)

  ঘ

  Titanium and lead
• Which of the following electrolyte is used for the preparation of a general galvanic series?
  ক

  Polluted seawater

  খ

  Unpolluted river water

  গ

  Polluted river water

  ঘ

  Unpovlluted seawater
• What is the abbreviation of EMF?
  ক

  Electromagnetic force

  খ

  Electromotive frequency

  গ

  Electromotive force

  ঘ

  Electrode motive force
• What is the standard reduction potential value of potassium in the EMF series?
  ক

  +0.337 V

  খ

  -2.925 V

  গ

  -0.763 V

  ঘ

  -1.662 V
• What is the standard reduction potential value of gold in the EMF series?
  ক

  +1.498 V

  খ

  +1.2 V

  গ

  +0.987 V

  ঘ

  +0.799 V
• What are the conditions to measure the standard reduction potential of metals against SHE?
  ক

  2 atm pressure, 25°C temperature, 2M concentration of H+

  খ

  2 atm pressure, 25°C temperature, 1M concentration of H+

  গ

  1 atm pressure, 25°C temperature, 1M concentration of H+

  ঘ

  1 atm pressure, 25°C temperature, 2M concentration of H+
• Which of the following is the primary characteristic of an electrolyte to form corrosion?
  ক

  Electrical resistivity

  খ

  Thermal resistivity

  গ

  Thermal conductivity

  ঘ

  Electrical conductivity
• Which of the following will act as cathode and anode respectively in a dry-cell battery?
  ক

  Zinc and carbon

  খ

  Carbon and zinc

  গ

  Magnesium and zinc

  ঘ

  Zinc and ammonium chloride
• Which of the following is the driving force in galvanic corrosion?
  ক

  Conductivity of electrolyte

  খ

  Crystal structure of metals

  গ

  The potential difference between the two metals

  ঘ

  Temperature of electrolyte
• Corrosion of less corrosion-resistant metal is usually increased and the attack of the more corrosion-resistant is decreased in galvanic corrosion.
  ক

  True

  খ

  False
• 1.What is the other name of galvanic corrosion?
  ক

  Bi-metallic corrosion

  খ

  Mono-metallic corrosion

  গ

  Localized corrosion

  ঘ

  Mono-metallic and localized corrosion