Answer the following statement(s) true (T) or false (F)
1. Nonlinear equations, such as those for the power flow, can have multiple solutions.
2. Because of line resistance, the power flow Jacobian matrix is guaranteed to never be singular.
3. In the power flow the voltage angle at the slack bus does not change.
4. The dc power flow solves for the per unit voltage magnitudes,assuming that the voltage angles are constant at zero degrees.
5. When solving a minimization problem adding contraints will result in a cost function value that is greater than or equal to that of the unconstrained problem.
1. True
2. False
3. True
4. False
5. True
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