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Theory of Machine

Theory of Machine
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

90°
0°
360°
180°

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Theory of Machine
In a radial cam, the follower moves

In any direction irrespective of the cam axis
In a direction parallel to the cam axis
Along the cam axis
In a direction perpendicular to the cam axis

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Theory of Machine
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m). (dx/dt) + (s/m). x = 0. If the roots of this equation are real, then the system will be

Under damped
Without vibrations
Over-damped
Critically damped

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Theory of Machine
When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in _________ directions.

None of these
Perpendicular
Same
Opposite

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Theory of Machine
When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

[(r + R) cosφ]/2
[(r² + R²) sinφ]/2
[(r + R) sinφ]/2
[(r² + R²) cosφ]/2

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Theory of Machine
In a screw jack, the effort required to lower the load W is given by

P = W cos(α + φ)
P = W tan(φ - α)
P = W tan(α - φ)
P = W tan(α + φ)

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