30 Questions
What is the most common type of line defect in a crystal structure?
Screw dislocation
In crystal structures, what is the function of an interstitial atom?
Causes dislocations
According to Bragg's law, what does the equation 𝑛𝜆 ⁄2𝑑 = 𝑠𝑖𝑛𝜃 represent?
Diffusion mechanism
What is the primary cause of diffusion in a crystal structure?
Simple mechanical work
Which type of crystal structure is X-ray diffraction most useful for studying?
Body-centered cubic
What property can X-ray diffraction be used to determine in a specimen?
Grain size
Under which conditions is Bernoulli's equation valid?
All points evaluated must be on the same streamline
What is the main requirement for Bernoulli's equation to be valid?
The fluid must be incompressible
Why is Bernoulli's equation not valid for compressible fluids?
Because it assumes incompressibility
Which law forms the basis for the energy conservation equation in flow systems?
The first law of thermodynamics
What aspect of Bernoulli's equation makes it only valid for certain flow conditions?
Requirement of steady flow
Which condition reduces the first law of thermodynamics for a control volume to Bernoulli's equation?
Steady flow without work interactions
What is a property of magnetic field lines according to the text?
The lines intersect surfaces of equal intensity at right angles.
Which unit is the tesla a measure of as per the text?
Magnetic flux density
What is the Coulomb force proportional to?
$1/r^2$
What is NOT a property of magnetic flux lines based on the text?
Magnetic flux lines do not have sources or sinks.
What does a dielectric material do with charge, as per the text?
The charge is confined to a region within the material.
In a magnetic field, where are the field lines stronger according to the text?
Where the lines are closer together.
Which of the following statements is FALSE regarding the torque curves of shunt and series motors?
The torque curves are affected by the value of the armature current.
Which of the following statements about the efficiency of shunt and series motors is FALSE?
Series motors have high torque at low speeds.
Which of the following statements regarding a compound motor is FALSE?
Its speed remains fairly constant when subjected to sudden loads.
Which of the following does NOT contribute to core losses in DC motors?
Eddy current and hysteresis losses in the field windings.
What is pole pitch?
The distance between the center of one pole and the center of the next pole.
Which of the following statements about compound motors is TRUE?
They have both a shunt winding and a series winding.
What is the main factor that affects the area and length of the grain boundaries in polycrystalline materials?
The grain size
Which of the following correctly describes the atoms located at grain boundaries?
All of the statements are true
Why does low-density polyethylene undergo extensive elongation prior to rupture compared to polystyrene?
Low-density polyethylene is less crystalline
Which of the following describes the modulus of elasticity of an elastomer?
It is directly proportional to the number of cross links in the elastomer
What is the main reason for the difference in elongation between low-density polyethylene and polystyrene?
Polystyrene has large styrene groups on the side of its carbon chain
What is the main factor that affects the area and length of the grain boundaries in polycrystalline materials?
The grain size
Test your knowledge on Bernoulli's equation validity conditions and energy conservation equation in flow systems. Questions also cover the surfaces velocity in relation to the fluid velocity. Find out if you can correctly answer questions related to fluid dynamics.
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