MSE 2001 HW 3 Spring Questions and
Answers
True/False: Elements with standard reduction potentials lower (more negative) than
water are susceptible to corrosion in aqueous environments, even when not in
contact with another metal. - ANS-True
True/False: Electrostriction is when you apply an electric field to a material and the
material's length changes. - ANS-True
A capacitor initially uses a dielectric material with a dielectric constant of 5. If that
dielectric layer is replaced with a new material having identical size to the initial
material but with a dielectric constant of 15, what happens to the capacitance of
the capacitor? - ANS-The capacitance will increase by a factor of 3x.
Which of the following elements would be a good selection for sacrificial electrode in
the cathodic protection of Iron? - ANS-Both A and B (Zinc, Manganese)
True/False: The remanent magnetization of a material is its level of permanent,
internal magnetization in no applied magnetic field. - ANS-True
True/False: To achieve good piezoelectric response, a material should have both a
high piezoelectric coefficient and have high electrical resistivity. - ANS-True
You are designing a system based on piezoelectric actuation to precisely move
objects at the nanometer scale. Your system is limited to an operating voltage of
1000 V. The system must be able to move objects AT LEAST 150 nm. You are
allowed to select amongst the following piezoelectric materials in the table below to
accomplish this mechanical motion. Which of these materials would you recommend
for this mechanical manipulation system?
Material I: d33 = 800 pm/V
Material II: d33 = 300 pm/V
Material III: d33 = 200 pm/V
Material IV: d33 = 100 pm/V - ANS-Materials I, II, and III
Which of the following approaches would be useful for improving a plastic's
resistance to UV degradation?
A. Adding a UV absorbing coating to the plastic's surface.
B. Including additives to the plastic's composition that help prevent UV degradation.
C. Electrically connecting the plastic component to a sacrificial anode. - ANS-Both A
and B
You work for a manufacturing facility that produces electrical resistors. Currently
Answers
True/False: Elements with standard reduction potentials lower (more negative) than
water are susceptible to corrosion in aqueous environments, even when not in
contact with another metal. - ANS-True
True/False: Electrostriction is when you apply an electric field to a material and the
material's length changes. - ANS-True
A capacitor initially uses a dielectric material with a dielectric constant of 5. If that
dielectric layer is replaced with a new material having identical size to the initial
material but with a dielectric constant of 15, what happens to the capacitance of
the capacitor? - ANS-The capacitance will increase by a factor of 3x.
Which of the following elements would be a good selection for sacrificial electrode in
the cathodic protection of Iron? - ANS-Both A and B (Zinc, Manganese)
True/False: The remanent magnetization of a material is its level of permanent,
internal magnetization in no applied magnetic field. - ANS-True
True/False: To achieve good piezoelectric response, a material should have both a
high piezoelectric coefficient and have high electrical resistivity. - ANS-True
You are designing a system based on piezoelectric actuation to precisely move
objects at the nanometer scale. Your system is limited to an operating voltage of
1000 V. The system must be able to move objects AT LEAST 150 nm. You are
allowed to select amongst the following piezoelectric materials in the table below to
accomplish this mechanical motion. Which of these materials would you recommend
for this mechanical manipulation system?
Material I: d33 = 800 pm/V
Material II: d33 = 300 pm/V
Material III: d33 = 200 pm/V
Material IV: d33 = 100 pm/V - ANS-Materials I, II, and III
Which of the following approaches would be useful for improving a plastic's
resistance to UV degradation?
A. Adding a UV absorbing coating to the plastic's surface.
B. Including additives to the plastic's composition that help prevent UV degradation.
C. Electrically connecting the plastic component to a sacrificial anode. - ANS-Both A
and B
You work for a manufacturing facility that produces electrical resistors. Currently
