Theory of Machine Torsional vibrations are said to occur when the particles of a body moves

Parallel to its axis
None of these
Perpendicular to its axis
In a circle about its axis

Theory of Machine Pitch point on a cam is

Any point on pitch curve
Any point on pitch circle
The point on cam pitch curve having the minimum pressure angle
The point on cam pitch curve having the maximum pressure angle

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

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

Theory of Machine In order to give a complete secondary balance of a multi-cylinder inline engine,

Both (A) and (B)
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
None of these
The algebraic sum of the secondary forces must be equal to zero

Simple
Binary
None of these
Compound

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

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