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Theory of Machine

Theory of Machine
If there are L number of links in a mechanism, then number of possible inversions is equal to

L
L + 2
L - 1
L + 1

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Theory of Machine
Idler pulley is used

For applying tension
For increasing velocity ratio
For changing the direction of motion of the belt
All of the listed here

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Theory of Machine
Module of a gear is

2T/D
T/D
2D/T
D/T

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Theory of Machine
The instantaneous centers which vary with the configuration of mechanism are called

Neither fixed nor permanent instantaneous centers
Fixed instantaneous centers
Permanent instantaneous centers
None of these

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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 distance between fixed pivots of crank and followers is

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

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Theory of Machine
In order to balance the reciprocating masses,

Both (A) and (B)
Primary forces and couples must be balanced
None of these
Secondary forces and couples must be balanced

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