Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is

l = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³

l = l₁ + l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴

Two heavy rotating masses are connected by shafts of lengths l₁, l�

1.	Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is
A.	(l₁ + l₂ + l₃)/3
B.	l = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³
C.	l = l₁ + l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴
D.	l₁ + l₂ + l₃
Answer» D. l₁ + l₂ + l₃

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Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is

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