For two phase AC servo motor, if \(R\) is resistance of rotor, \(X\) is reactance of rotor, \(L\) is length of rotor and \(\mathrm{D}\) is diameter of rotor then
(a) \(\mathrm{X} / \mathrm{R}\) and \(\mathrm{L} / \mathrm{D}\) are both small.
(b) \(\mathrm{X} / \mathrm{R}\) is large but \(\mathrm{L} / \mathrm{D}\) is small.
(c) \(\mathrm{X} / \mathrm{R}\) is small but \(\mathrm{L} / \mathrm{D}\) is large.
(d) \(\mathrm{X} / \mathrm{R}\) and \(\mathrm{L} / \mathrm{D}\) are both large.