Corrosion and Fluid Mechanics Quiz
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Questions and Answers

Which of the following correctly defines fuel?

  • A compound composed of Carbon and Hydrogen.
  • A compound composed of Carbon and Hydrogen, easily burn in air. (correct)
  • A compound that produces large amounts of heat. (correct)
  • A chemical that provides energy through combustion.

    • What is the ideal surface tension of fuel?

  • High
  • Moderate
  • Low (correct)
  • Dependent on specific conditions

    • To remove dissolved oxygen from feeding water of a boiler at high pressure, which method is appropriate?

  • Filtration method
  • Use of a reducing agent (correct)
  • Chemical oxidation
  • Heating the water

    • What is the main component used to remove oil and suspended colloids from water?

    <p>Alum</p> Signup and view all the answers

    What leads to corrosion of zinc metal when immersed in caustic soda?

    <p>Electrolytic action</p> Signup and view all the answers

    Stress corrosion cracking of alloys is influenced by which factors?

    <p>Both B and C</p> Signup and view all the answers

    What is the correct definition of pitting corrosion?

    <p>Localized corrosion that leads to the formation of small pits</p> Signup and view all the answers

    In a galvanic cell involving iron and copper, what is the anodic reaction for iron?

    <p>Fe → Fe^+2 + 2e</p> Signup and view all the answers

    What is the best method to protect a pipeline carrying crude petroleum oil?

    <p>Both cathodic protection and paints.</p> Signup and view all the answers

    What is one mechanism through which inhibitors provide protection against corrosion?

    <p>Elimination of active corrosive agents.</p> Signup and view all the answers

    What is a necessary condition for the impressed current in cathodic protection?

    <p>Protection potential must be greater than or equal to corrosion potential.</p> Signup and view all the answers

    Which of the following causes corrosion inside boilers?

    <p>All of the above.</p> Signup and view all the answers

    What is produced when using untreated water that contributes to scale formation?

    <p>Dissolved salts forming a dry adhesive layer.</p> Signup and view all the answers

    Permanent hardness of water is primarily caused by which of the following?

    <p>Calcium and magnesium salts.</p> Signup and view all the answers

    Increasing the percentage of paraffins in fuel is associated with which of the following?

    <p>both A and B</p> Signup and view all the answers

    What is an incorrect option regarding methods of pipeline corrosion protection?

    <p>Both A and C are incorrect.</p> Signup and view all the answers

    What does the ash content of a fuel refer to?

    <p>both A and C</p> Signup and view all the answers

    Which of the following does NOT contribute to the effectiveness of cathodic protection?

    <p>Electric leakage in the system.</p> Signup and view all the answers

    The formation of carbon monoxide during the combustion of fuel is primarily due to which factor?

    <p>both B and C</p> Signup and view all the answers

    Kinematic viscosity is related to which of the following factors?

    <p>all of the above</p> Signup and view all the answers

    A decrease in hydrogen content of a fuel is associated with which outcomes?

    <p>both A and B</p> Signup and view all the answers

    An increase in the hydrogen content of a fuel tends to result in which effect?

    <p>all of the above</p> Signup and view all the answers

    The dynamic viscosity of a fuel is related to which of the following forces?

    <p>both A and C</p> Signup and view all the answers

    Good ignition of the fuel is primarily owing to which factor?

    <p>all of the above</p> Signup and view all the answers

    Which salt is responsible for causing permanent hardness of water?

    <p>Magnesium sulfate</p> Signup and view all the answers

    Which of the following agents can be used to avoid formation of oils and colloids in water?

    <p>Alum as a coagulating agent</p> Signup and view all the answers

    What role does silver metal play in the electroplating method to protect iron from atmospheric corrosion?

    <p>Serves as a cathode in the electroplating cell</p> Signup and view all the answers

    Which condition is crucial for the Impressed current method of Cathodic Protection?

    <p>Protection potential must exceed the corrosion potential</p> Signup and view all the answers

    What should the pH of feeding water of boilers be maintained at?

    <p>pH between 8 and 10</p> Signup and view all the answers

    Which of the following is NOT a method to decrease the corrosion of a corrosive solution inside a metallic pipeline?

    <p>Increasing temperature</p> Signup and view all the answers

    Which cell converts electrical energy into chemical energy?

    <p>Electrolytic cell</p> Signup and view all the answers

    What type of corrosion occurs due to the loss of coherence forces between the grains?

    <p>Intergranular corrosion</p> Signup and view all the answers

    What is the cathodic reaction in a Mg-Fe galvanic cell in a neutral medium?

    <p>Fe → Fe^+2^ + 2e</p> Signup and view all the answers

    What is the primary concern regarding non-burn compounds during fuel combustion?

    <p>They produce ash and residues.</p> Signup and view all the answers

    Which conditions apply to the sacrificial anode method of cathodic protection?

    <p>Protected metallic structure must be cathode</p> Signup and view all the answers

    What type of corrosion occurs when a metal is exposed to acidic vapor?

    <p>Chemical corrosion</p> Signup and view all the answers

    What is one consequence of scale formation inside boilers?

    <p>Decreased heat transfers and increased fuel consumption.</p> Signup and view all the answers

    In differential aeration corrosion, what is the cathodic reaction?

    <p>H2O + 1/2 O2 + 2e → 2OH^-</p> Signup and view all the answers

    Which statement about ash content in fuel is true?

    <p>It comprises inorganic compounds</p> Signup and view all the answers

    What effect does decreasing the specific gravity of fuel have?

    <p>Both A and C.</p> Signup and view all the answers

    Which of the following parameters contributes to good ignition in fuel?

    <p>Lower viscosity</p> Signup and view all the answers

    Which combination of factors tends to promote good combustion of fuel?

    <p>Lower specific gravity and surface tension.</p> Signup and view all the answers

    What is the main condition for effective sacrificial anode cathodic protection?

    <p>The anode must be less noble than the protected metal</p> Signup and view all the answers

    What should the pH of water entering an anion exchange resin be?

    <p>Less than 7.</p> Signup and view all the answers

    What conditions should feeding water for boilers meet?

    <p>It must be free from dissolved oxygen.</p> Signup and view all the answers

    What does the flash point of a fuel indicate?

    <p>The minimum temperature required for the fuel to ignite.</p> Signup and view all the answers

    What is a significant factor leading to a lowering of the calorific value of fuel?

    <p>Water formation during combustion.</p> Signup and view all the answers

    How is sludge formed inside water pipes characterized?

    <p>As a result of impurities in water.</p> Signup and view all the answers

    Study Notes

    Section I - Corrosion

    • Mineral acids are more corrosive than moist air, organic acids, and sea water. All of the above.
    • Iron corrodes easily in the atmosphere due to its high activity and its reaction with oxygen.
    • Passivity to corrosion depends on the metal's resistivity, the type of metal, and the corrosive environment.
    • Pitting corrosion occurs due to non-uniform surfaces and non-uniform corrosive impurities, resulting in localized reactions.
    • Galvanic corrosion involves a reduction reaction in a neutral medium, with the oxidation reaction involving water and oxygen, producing hydroxide ions.
    • Decreasing water velocity in pipelines will decrease pitting corrosion.

    Section II - True or False

    • Calorific value is the energy released from completely burning a unit mass of fuel, true.
    • Dynamic viscosity relates to the motion, false.
    • Ion exchange resins remove non-ionized salts; false.
    • Scale is characterized by bad heat conductivity, true.
    • Inert barriers resist corrosion in various environments, false.
    • Corrosion inhibitors are chemical compounds that reduce corrosion, true.
    • Pitting and intergranular corrosion are localized electrochemical reactions, true.
    • Uniform corrosion is localized, false.
    • Non-metallic structures exposed to seawater experience erosion corrosion; false.
    • Ion exchange resins remove all salts from water; false.
    • Inert barriers resist corrosion in specific environments; true.
    • Organic inhibitors' mechanisms involve electron-electron interactions; true.
    • Non-metallic structures corrode when exposed to seawater via erosion corrosion; false.
    • Inhibitors are used in gaseous and liquid mediums to reduce corrosion; true.
    • Sludge's adhesion is higher, and it's dryer than scale; false.
    • Decreasing fuel specific gravity promotes better ignition, true.
    • Metal corrosiveness based on resistivity, primarily depends on the metal type and corrosive environment; false.
    • Hydrazine is an anti-corrosion agent; true.
    • Fuel is the amount of energy released when a unit mass is completely burned in the air, false.
    • Uniform corrosion is chemical, true.
    • Dissolved metals in acidic or alkaline environments are non-uniform corrosion, false.
    • Scale is a good conductor of heat, false.
    • Sacrificial anode corrosion protection works in multiple mediums, false.
    • Impressed current protection method involves the potential protection exceeding corrosion potential, true.
    • Good combustion fuel has low surface tension, and increasing carbon percentage decreases calorific value; true and true.
    • Deionized water is free from ionized and non-ionized salts; false.
    • Feeding water in boilers should be free from oxygen, true.
    • Inhibitors decrease corrosion via chemical compounds, true.
    • Ion exchange resins remove non-ionized salts dissolved in water; false.

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    Description

    Test your knowledge on the principles of corrosion and fluid mechanics. This quiz covers various aspects of corrosion types, mechanisms, and their impact on materials, as well as concepts related to fuel energy and viscosity. Challenge yourself and see how well you understand these critical engineering topics!

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