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Questions and Answers
What is the term for the magnetic retentivity that remains in a substance even when the magnetic field is zero?
What is the term for the magnetic retentivity that remains in a substance even when the magnetic field is zero?
- Saturation point
- Hysteresis loss
- Residual magnetism (correct)
- Coercive force
What is the point at which the material is totally demagnetized?
What is the point at which the material is totally demagnetized?
- Point D
- Point C (correct)
- Point B
- Point A
What is the energy loss caused by the friction of molecules in the core of electric machines?
What is the energy loss caused by the friction of molecules in the core of electric machines?
- Hysteresis loss (correct)
- Magnetic retentivity
- Coercive force
- Hysteresis
What is the direction of the magnetic field produced by an alternating current?
What is the direction of the magnetic field produced by an alternating current?
What is the purpose of the coercive force in a magnetic material?
What is the purpose of the coercive force in a magnetic material?
What is the term for the cycle of magnetization and demagnetization in a ferromagnetic material?
What is the term for the cycle of magnetization and demagnetization in a ferromagnetic material?
What is the typical amount of energy stored in a piezoelectric generator after a tap or press?
What is the typical amount of energy stored in a piezoelectric generator after a tap or press?
What is the main goal of improving the piezoelectric material itself?
What is the main goal of improving the piezoelectric material itself?
Why is placing the piezoelectric material in certain locations a focus of research?
Why is placing the piezoelectric material in certain locations a focus of research?
What is the piezoelectric effect?
What is the piezoelectric effect?
What is an example of a common piezoelectric material?
What is an example of a common piezoelectric material?
How much energy does a typical cell phone battery store?
How much energy does a typical cell phone battery store?
What is the work function represented as for metals?
What is the work function represented as for metals?
What is the energy difference between the conduction band minimum and the vacuum energy level?
What is the energy difference between the conduction band minimum and the vacuum energy level?
What type of contact is formed when a metal and a semiconductor material are brought together with no electron movement?
What type of contact is formed when a metal and a semiconductor material are brought together with no electron movement?
What is the purpose of the Schottky diode when used as a rectifier contact?
What is the purpose of the Schottky diode when used as a rectifier contact?
What is the condition for the formation of a Schottky contact when φm > φs?
What is the condition for the formation of a Schottky contact when φm > φs?
What type of semiconductors can form the Schottky contact?
What type of semiconductors can form the Schottky contact?
What is the Schottky barrier?
What is the Schottky barrier?
What is the consequence of electrons transferring from the semiconductor to the metal in a Schottky barrier contact?
What is the consequence of electrons transferring from the semiconductor to the metal in a Schottky barrier contact?
What is the energy difference between the band edge with majority carriers and the Fermi energy of the metal?
What is the energy difference between the band edge with majority carriers and the Fermi energy of the metal?
Under what condition is the equilibrium band structure for a metal and a n-type semiconductor established?
Under what condition is the equilibrium band structure for a metal and a n-type semiconductor established?
What is the reason for the formation of a depletion region at the semiconductor surface?
What is the reason for the formation of a depletion region at the semiconductor surface?
What is the relationship between the work function of semiconductors and the electron affinity?
What is the relationship between the work function of semiconductors and the electron affinity?
What happens to the depletion region as the applied voltage is continuously increased?
What happens to the depletion region as the applied voltage is continuously increased?
Why does a positive current get generated across the MS junction?
Why does a positive current get generated across the MS junction?
What is the effect of increasing the applied voltage on the electrons in the MS junction?
What is the effect of increasing the applied voltage on the electrons in the MS junction?
What happens to the current as the VA is kept increasing?
What happens to the current as the VA is kept increasing?
What is the direction of the current in the MS junction when VA is positive?
What is the direction of the current in the MS junction when VA is positive?
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