## Theory of Machine The danger of breakage and vibration is maximum

None of these
Near the critical speed
Below the critical speed
Above the critical speed

Simple
None of these
Compound
Binary

## Theory of Machine In a multiple V-belt drive, if one of the belts is broken, then we should replace

All the belts
The broken belt and the belts on either side of it
The broken belt only
None of these

## Theory of Machine Bifilar suspension method is used to find the

Angular acceleration of the body
Moment of inertia of the body
Frequency of vibration of the body
Periodic time of the body

## Theory of Machine 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

(l₁ + l₂ + l₃)/3
l = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³
l₁ + l₂ + l₃
l = l₁ + l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴

None of these
Open pair
Sliding pair
Kinematic pair