Consider the following statements about root locus

1. The root locus is symmetrical about real axis.
2. If a root locus branch moves along the real axis from an open loop pole to zero or to infinity, this root locus branch is called real root branch.
3. The breakaway points of the root locus are the solutions of

Which statements out of above are correct?

For the system in the given figure, the gain margin is

Consider the following statements about variable reluctance stepper motor used in control system

1. The static torque acting on rotor is a function of angular misalignment between stator and rotor teeth
2. There are two positions of zero torque i.e, . Q = 0 and where T is the number of rotor teeth
3. Both zero torque positions are stable
4. When stator is excited, rotor is pulled into minimum reluctance position

Of these statements, the correct ones are

In force current analogy, displacement x is analogous to

For an m x n matrix A, the eigen values are the roots of the characteristic equation