Theory of Machine
Idler pulley is used

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

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Theory of Machine
In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines

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

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