A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately are 100 cycles/sec and 200 cycles/sec respectively. The lowest critical speed is

A shaft has two heavy rotors mounted on it. The transverse natural fre

1.	A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately are 100 cycles/sec and 200 cycles/sec respectively. The lowest critical speed is
A.	6000 rpm
B.	9360 rpm
C.	5367 rpm
D.	1259 rpm
Answer» D. 1259 rpm

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A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately are 100 cycles/sec and 200 cycles/sec respectively. The lowest critical speed is

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