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Theory of Machine

Theory of Machine
If the number of links in a mechanism is equal to l, then the numbers of possible inversions are equal to

l
l + 1
l - 1
l - 2

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

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

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Theory of Machine
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

Base circle
Prime circle
Pitch curve
Pitch circle

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Theory of Machine
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

2 fn
fn/2
8 fn
4 fn

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Theory of Machine
If some links are connected such that motion between them can take place in more than one direction, it is called

Completely constrained motion
Partially constrained motion
Incompletely constrained motion
Successfully constrained motion

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Theory of Machine
Two systems shall be dynamically equivalent when

The mass of two are same
M.I. of two about an axis through e.g. is equal
G. of two coincides
All of these

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