MTE EXAM 3 QUESTIONS
AND ANSWERS
Which type of charge carrier will be introduced into a semiconductor by the presence of
an acceptor impurity? - Answer- Hole
For a semiconductor, when an electric field is applied, in which direction are the holes
accelerated? - Answer- Same direction as electric field
Which of the following have a significant influence on a material's electrical resistivity?
(Impurity concentration,
Percent cold work,
Vacancy concentration,
Temperature) - Answer- All the above
Are energies for holes greater or less than the Fermi energy? - Answer- Less than
For a material that contains N atoms, how many electron states will there be in a p
band? - Answer- 3N
The typical electrical conductivity value/range for semiconducting materials is - Answer-
10-6 to 10^4 (Ω-m)-1
How do thermal conductivities of single crystals and polycrystalline materials compare?
- Answer- Single crystal conductivity is greater
The relationship between true stress σ, true strain ε, and the strain-hardening exponent
n is sometimes known as the power law and is expressed as - Answer- σ = Kεn
(T/F) Metallic materials that have undergone work hardening possess increased
strength but reduced ductility. - Answer- True
As the amount of cold work on a metal increases, both the yield strength and the
______
strength will increase. - Answer- Tensile
The three steps of age hardening are solution ______,_________, and aging - Answer-
treatment, quenching
AND ANSWERS
Which type of charge carrier will be introduced into a semiconductor by the presence of
an acceptor impurity? - Answer- Hole
For a semiconductor, when an electric field is applied, in which direction are the holes
accelerated? - Answer- Same direction as electric field
Which of the following have a significant influence on a material's electrical resistivity?
(Impurity concentration,
Percent cold work,
Vacancy concentration,
Temperature) - Answer- All the above
Are energies for holes greater or less than the Fermi energy? - Answer- Less than
For a material that contains N atoms, how many electron states will there be in a p
band? - Answer- 3N
The typical electrical conductivity value/range for semiconducting materials is - Answer-
10-6 to 10^4 (Ω-m)-1
How do thermal conductivities of single crystals and polycrystalline materials compare?
- Answer- Single crystal conductivity is greater
The relationship between true stress σ, true strain ε, and the strain-hardening exponent
n is sometimes known as the power law and is expressed as - Answer- σ = Kεn
(T/F) Metallic materials that have undergone work hardening possess increased
strength but reduced ductility. - Answer- True
As the amount of cold work on a metal increases, both the yield strength and the
______
strength will increase. - Answer- Tensile
The three steps of age hardening are solution ______,_________, and aging - Answer-
treatment, quenching
