Correct option is C
In electrical power systems, the impedance of various components plays a significant role in limiting fault currents.
For cables, the impedance is primarily resistive, especially for shorter lengths of cables. This is because the resistance of the conductor material (typically copper or aluminum) is the dominant factor in determining the impedance of the cable.
Inductive reactance becomes significant only over longer distances or at higher frequencies, but for most practical purposes in power systems, the resistance is the main component limiting fault current in cables.
Explanation for Other Options:
Transformer: The impedance of a transformer is largely reactive (inductive) because of the coils and magnetic core.
Reactor: The impedance of a reactor is predominantly reactive (inductive) as it is specifically designed to limit current by adding inductance.
Generator: The impedance of a generator includes both resistive and reactive components, but the reactive (inductive) component is typically more significant in limiting fault currents.
Therefore, among the given options, cables are the components where the impedance is mostly resistive.
