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Theory of Machine

Theory of Machine
A cam mechanism imparts following motion

All of these
Reciprocating
Oscillating
Rotating

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Theory of Machine
A system in dynamic balance implies that

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

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Theory of Machine
In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

Have perfect balancing
Minimize the effect of primary forces
Minimize the effect of secondary forces
To start the locomotive quickly

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Theory of Machine
Idler pulley is used

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

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Theory of Machine
The critical speed of a shaft depends upon its

Mass and stiffness
Stiffness
Mass
Stiffness and eccentricity

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Theory of Machine
When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

Self-closed pair
Force-closed pair
Lower pair
Higher pair

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