MCE132 Basic Properties of Engineering Materials Quiz
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Questions and Answers

What is the definition of specific heat capacity (𝐶𝑃) of a substance?

  • The amount of energy required to cause a unit increase in temperature for one unit mass of the substance (correct)
  • The energy transferred through a material with unit area and thickness in a unit time
  • The amount of energy required to cause a unit decrease in temperature for one unit mass of the substance
  • The heat quantity transferred through a homogeneous layer of the material with unit area and thickness in a unit time

    • What does the coefficient of thermal conductivity (λ) measure?

  • The amount of heat required to change the temperature of a substance
  • The energy required to raise the temperature of a substance by one unit
  • The rate of heat transfer through a material with a temperature difference of 1°C
  • The amount of heat transferred through a material with unit area and thickness in a unit time (correct)

    • Which unit is used to measure specific heat capacity (𝐶𝑃)?

  • J
  • W/m
  • J/kg. oC (correct)
  • kg

    • For which type of material is the coefficient of thermal conductivity most relevant?

    <p>Conductive materials</p> Signup and view all the answers

    How is specific heat capacity (𝐶𝑃) related to the temperature change and mass of a substance?

    <p>Directly proportional to both temperature change and mass</p> Signup and view all the answers

    What does the symbol ∆𝑄 represent in the equation ∆𝑄 = 𝐶𝑃 ∙ 𝑚 ∙ ∆𝜃?

    <p>Heat quantity added to the substance</p> Signup and view all the answers

    What property of a material refers to its response to exposure to electromagnetic radiation, particularly visible light?

    <p>Optical property</p> Signup and view all the answers

    What is the reciprocal of conductivity?

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

    What is the unit of dielectric strength?

    <p>KV/cm</p> Signup and view all the answers

    What type of material allows relatively little absorption and reflection of light?

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

    What is the property of a material which resists the flow of electric current through it?

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

    What is the effect of voids on the coefficient of thermal conductivity?

    <p>Decreases it</p> Signup and view all the answers

    What does the specific heat capacity (𝐶𝑃) of a substance measure?

    <p>The amount of energy needed to increase the temperature of the substance by one unit</p> Signup and view all the answers

    What is the coefficient of thermal conductivity (λ) a measure of?

    <p>The ability of the substance to conduct heat</p> Signup and view all the answers

    In the equation ∆𝑄 = 𝐶𝑃 ∙ 𝑚 ∙ ∆𝜃, what does ∆𝑄 represent?

    <p>The change in temperature of the substance</p> Signup and view all the answers

    What unit is used to measure the specific heat capacity (𝐶𝑃) of a substance?

    <p>J/kg. oC</p> Signup and view all the answers

    What is the thermal conductivity of a material with a unit area (1 m2) and a unit thickness (1 m) in a unit time (sec.) when the difference in temperature between the two sides equals 1 °C in the steady state?

    <p>Coefficient of thermal conductivity (λ)</p> Signup and view all the answers

    What does the symbol λ represent in the context of thermal properties of materials?

    <p>The coefficient of thermal conductivity</p> Signup and view all the answers

    What does the coefficient of thermal resistance (R) measure?

    <p>The measure of heat flow resistance per unit area of the element thickness</p> Signup and view all the answers

    What is the property of material which allows the flow of electric current through it?

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

    Which type of material is relatively little or no transmission of light?

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

    What does the dielectric strength indicate?

    <p>The ability of a material to withstand high voltages</p> Signup and view all the answers

    What is the effect of voids on the coefficient of thermal conductivity?

    <p>Decreases the coefficient of thermal conductivity</p> Signup and view all the answers

    What is the reciprocal of conductivity?

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

    What does the temperature coefficient of resistance indicate?

    <p>The change in resistance of material with change in temperature</p> Signup and view all the answers

    What does Dielectric Strength measure?

    <p>The ability of a material to withstand high voltages</p> Signup and view all the answers

    What does Optical property refers to?

    <p>Materials response to electromagnetic radiation and visible light.</p> Signup and view all the answers

    What are Transparent materials known for?

    <p>Relatively little absorption and reflection.</p> Signup and view all the answers

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