$7)$ Conversion to a common reference frame is necessary because we will need to normalize the conversion from machine coordinates to system reference.

True

False

$8)$ Individual loads have been observed and modeled statistically to capture the consistency of the system loads. Indeed, achieving the accuracy of load modeling can be challenging because:

Most of the load is located at the transmission level distribution level

The number of individual devices to be considered is extremely large

Emergence with more distributed energy resources $($DERs$)$

The amount and composition of the load does not change it continuously changes

Load response to voltage and frequency variations in different ways

$9)$ The Kron reduction method has played a crucial role to simplify the network topology based on the number of loads in an observed power system so that we can characterize the multimachine systems in the network.

True

False

$10)$ The design of numerical solvers for power system dynamics introduced in multimachine systems would give you an idea of how to implement the software systems in characterizing the machine models. The differential and algebraic equations are the machine$-$to$-$network interface in a bulk power system where it may involve the combination of linearity and nonlinearity. The "design pyramid" could involve the following choice:

Linear and nonlinear solvers

Integration methods

Hardware supporting infrastructure

Computer operating systems

Strategies

$11)$ The ZIP models and their combination have been included with constant impedance, current, and power, respectively. However, the overall load model does not consist of frequency deviation in the characterization of behaviors.

True

False

$12)$ Loads dictate the way how power is consumed and can be exhibited by the variation in voltage and frequency throughout the network. Typically, the modeling of load can be categorized as the follows:

Distributed energy resources

Induction motors

Static loads

Unbalanced loads

Power$-$electronic loads