Fluid Dynamics Quiz: Bernoulli's Equation and Energy Conservation
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Questions and Answers

What is the most common type of line defect in a crystal structure?

  • Screw dislocation (correct)
  • Tilt boundary
  • Schottky imperfection
  • Vacancy

    • In crystal structures, what is the function of an interstitial atom?

  • Forms vacancies
  • Increases crystal size
  • Prevent diffusion
  • Causes dislocations (correct)

    • According to Bragg's law, what does the equation 𝑛𝜆 ⁄2𝑑 = 𝑠𝑖𝑛𝜃 represent?

  • Size of interstitial atoms
  • Atomic number of elements
  • Electron arrangement in crystals
  • Diffusion mechanism (correct)

    • What is the primary cause of diffusion in a crystal structure?

    <p>Simple mechanical work</p> Signup and view all the answers

    Which type of crystal structure is X-ray diffraction most useful for studying?

    <p>Body-centered cubic</p> Signup and view all the answers

    What property can X-ray diffraction be used to determine in a specimen?

    <p>Grain size</p> Signup and view all the answers

    Under which conditions is Bernoulli's equation valid?

    <p>All points evaluated must be on the same streamline</p> Signup and view all the answers

    What is the main requirement for Bernoulli's equation to be valid?

    <p>The fluid must be incompressible</p> Signup and view all the answers

    Why is Bernoulli's equation not valid for compressible fluids?

    <p>Because it assumes incompressibility</p> Signup and view all the answers

    Which law forms the basis for the energy conservation equation in flow systems?

    <p>The first law of thermodynamics</p> Signup and view all the answers

    What aspect of Bernoulli's equation makes it only valid for certain flow conditions?

    <p>Requirement of steady flow</p> Signup and view all the answers

    Which condition reduces the first law of thermodynamics for a control volume to Bernoulli's equation?

    <p>Steady flow without work interactions</p> Signup and view all the answers

    What is a property of magnetic field lines according to the text?

    <p>The lines intersect surfaces of equal intensity at right angles.</p> Signup and view all the answers

    Which unit is the tesla a measure of as per the text?

    <p>Magnetic flux density</p> Signup and view all the answers

    What is the Coulomb force proportional to?

    <p>$1/r^2$</p> Signup and view all the answers

    What is NOT a property of magnetic flux lines based on the text?

    <p>Magnetic flux lines do not have sources or sinks.</p> Signup and view all the answers

    What does a dielectric material do with charge, as per the text?

    <p>The charge is confined to a region within the material.</p> Signup and view all the answers

    In a magnetic field, where are the field lines stronger according to the text?

    <p>Where the lines are closer together.</p> Signup and view all the answers

    Which of the following statements is FALSE regarding the torque curves of shunt and series motors?

    <p>The torque curves are affected by the value of the armature current.</p> Signup and view all the answers

    Which of the following statements about the efficiency of shunt and series motors is FALSE?

    <p>Series motors have high torque at low speeds.</p> Signup and view all the answers

    Which of the following statements regarding a compound motor is FALSE?

    <p>Its speed remains fairly constant when subjected to sudden loads.</p> Signup and view all the answers

    Which of the following does NOT contribute to core losses in DC motors?

    <p>Eddy current and hysteresis losses in the field windings.</p> Signup and view all the answers

    What is pole pitch?

    <p>The distance between the center of one pole and the center of the next pole.</p> Signup and view all the answers

    Which of the following statements about compound motors is TRUE?

    <p>They have both a shunt winding and a series winding.</p> Signup and view all the answers

    What is the main factor that affects the area and length of the grain boundaries in polycrystalline materials?

    <p>The grain size</p> Signup and view all the answers

    Which of the following correctly describes the atoms located at grain boundaries?

    <p>All of the statements are true</p> Signup and view all the answers

    Why does low-density polyethylene undergo extensive elongation prior to rupture compared to polystyrene?

    <p>Low-density polyethylene is less crystalline</p> Signup and view all the answers

    Which of the following describes the modulus of elasticity of an elastomer?

    <p>It is directly proportional to the number of cross links in the elastomer</p> Signup and view all the answers

    What is the main reason for the difference in elongation between low-density polyethylene and polystyrene?

    <p>Polystyrene has large styrene groups on the side of its carbon chain</p> Signup and view all the answers

    What is the main factor that affects the area and length of the grain boundaries in polycrystalline materials?

    <p>The grain size</p> Signup and view all the answers

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