16989. A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is September 13, 2025 by Admin 5367 r.p.m. 6000 r.p.m. 9360 r.p.m. 12000 r.p.m. ✅ The correct answer is option A.