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Theory of Machine

Theory of Machine
If two moving elements have surface contact in motion, such pair is known as

Higher pair
Rolling pair
Sliding pair
Surface pair

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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)

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

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Theory of Machine
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

Damping factor
Magnification factor
Logarithmic decrement
Damping coefficient

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Theory of Machine
When the body is suspended at the point of suspension, its periodic time and frequency will be ________ as compared to the body suspended at the point of percussion.

Same
Four times
None of these
Two times

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Theory of Machine
In an ideal machine, the output as compared to input is

More
Less
May be less or more depending on efficiency
Equal

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Theory of Machine
Torsional vibrations are said to occur when the particles of a body moves

In a circle about its axis
Parallel to its axis
Perpendicular to its axis
None of these

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