📊 Theory Of Machine
Q. 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
  • (A) 5,367 r.p.m.
  • (B) 6,000 r.p.m.
  • (C) 9,360 r.p.m.
  • (D) 12,000 r.p.m.
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✅ Correct Answer: (A) 5,367 r.p.m.

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