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Theory of Machine

Theory of Machine
In automobiles the power is transmitted from gear box to differential through

Knuckle joint
Universal joint
Bevel gear
Hooke's joint

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Theory of Machine
If the damping factor for a vibrating system is unity, then the system will be

Critically damped
Over damped
Under damped
Without vibrations

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Theory of Machine
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

Ensure proper alignment
Ensure uniform loading
Reduce slip
Reduce vibration

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Theory of Machine
When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

[(r + R) sinφ]/2
[(r + R) cosφ]/2
[(r² + R²) cosφ]/2
[(r² + R²) sinφ]/2

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Theory of Machine
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

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

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Theory of Machine
An automobile steering gear is an example of

Lower pair
Rolling pair
Higher pair
Sliding pair

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