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, l2 an

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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