Question 1

KKT equations relate
A) real and imaginary part of impedance
B) magnitude and phase of impedance
C) real part of impedance and admittance
D) none of the above

Accepted Answer

A,B

Question 2

The challenges in applying KKT by integration is
A) limited frequency range of data
B) wide spacing in frequency
C) both of the above
D) none of the above

Accepted Answer

As the frequency range of data is limited and there is wide spacing in frequency, it becomes difficult to apply KKT by integration. Limited frequency range of data means that there are not enough data points to accurately represent the whole spectrum of the system. Wide spacing in frequency means that there are large gaps between the data points, which makes it difficult to accurately capture the behavior of the system between those points. Both of these factors make it challenging to apply KKT by integration.

Question 3

If the real part of an impedance spectrum has negative values, they can be converted to positive values by
A) adding a large enough resistor in series
B) adding a large enough capacitor in parallel
C) adding a small enough capacitor in series
D) adding a small enough resistance in parallel

Accepted Answer

D

Question 4

Linear KKT software employs
A) KKT by integration
B) linearization of KKT equation
C) measurement model approach
D) KKT with extrapolation

Accepted Answer

The answer of Linear KKT software employs
A) KKT by integration
B)...

Question 5

When stability criterion is violated, difference between original and KK transformed data appear mainly in __________________ frequencies (one word)

Accepted Answer

The answer of When stability criterion is violated, difference between...

Question 6

Data from linear, causal, and stable system will always be KKT compliant.

Accepted Answer

KKT conditions are necessary conditions for optimality of a convex optimization problem. Linear, causal, and stable systems are often associated with convex optimization problems, and thus their data will always satisfy the KKT conditions.

Question 7

Impedance spectrum from a circuit consisting of passive elements
A) is KKT compliant only if the perturbation is small
B) is KKT compliant only if multi-sine is applied
C) is always KKT compliant
D) is never KKT complaint.

Accepted Answer

Impedance spectrum from a circuit consisting of passive elements is always KKT compliant, regardless of the size of the perturbation or the input signal used (such as multi-sine). This is because the passive elements do not introduce any nonlinearity into the circuit, and therefore the KKT conditions are always satisfied.

Question 8

If a potential instability is present, then the effect manifests mainly in
A) high frequencies
B) low frequencies
C) both of the above
D) none of the above

Accepted Answer

Potential instabilities typically affect low frequencies, causing them to become unstable or oscillate. High frequencies are generally less affected.

Question 9

Linear KKT converts the KKT integrals into a linear form.

Accepted Answer

The Karush-Kuhn-Tucker (KKT) conditions are a set of necessary conditions for a solution in nonlinear programming to be optimal, given certain regularity conditions. They do not convert integrals into a linear form but rather are used to solve optimization problems that may be linear or nonlinear.

Question 10

In the measurement model approach, a circuit of the following type can be used
A) Ladder
B) Voigt
C) Warburg
D) all of the above

Accepted Answer

The answer of In the measurement model approach, a circuit...

Question 11

A given EIS data was validated using the measurement model approach. It shows large systematic residuals. This could be because
A) data is from a system which is not KKT compliant
B) model fitting is not done properly
C) either of the above
D) none of the above

Accepted Answer

Large systematic residuals indicate that there is some issue with either the measurement model or the system being measured. It could be that the system is not KKT compliant, or that the model fitting was not done properly. Therefore, option C, "either of the above," is the best choice. Option D, "none of the above," can be ruled out as there is clearly an issue with the data.

Question 12

When data contains negative values for real part of impedance, KKT must be performed on ______________ form of data (one word).

Accepted Answer

The answer of When data contains negative values for real...

Quiz 3: Data Validation

KKT equations relate

The challenges in applying KKT by integration is

If the real part of an impedance spectrum has negative values, they can be converted to positive values by

Linear KKT software employs

When stability criterion is violated, difference between original and KK transformed data appear mainly in __________________ frequencies (one word)

Data from linear, causal, and stable system will always be KKT compliant.

Impedance spectrum from a circuit consisting of passive elements

If a potential instability is present, then the effect manifests mainly in

Linear KKT converts the KKT integrals into a linear form.

In the measurement model approach, a circuit of the following type can be used

A given EIS data was validated using the measurement model approach. It shows large systematic residuals. This could be because

When data contains negative values for real part of impedance, KKT must be performed on ______________ form of data (one word).