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Theory of Machine

Theory of Machine
A cam with a roller follower would constitute following type of pair

Lower pair
Open pair
Higher pair
Close pair

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Theory of Machine
The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is

Along PO
Perpendicular to PO
None of the listed here
At 45° to PO

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Theory of Machine
A system in dynamic balance implies that

The system is also statically balanced
There will absolutely no wear of bearings
There is no critical speed in the system
The system is critically damped

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

Slightly less than 45 mm
45 mm
Slightly more than 45 mm
95 mm

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

360°
90°
180°
0°

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Theory of Machine
The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body, and δ = Static deflection of the body)

1/2π × √(s/m)
0.4985/√δ
1/2π × √(g/δ)
Any one of the listed here

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