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Theory of Machine

Theory of Machine
Shaft revolving in a bearing is the following type of pair

Spherical pair
Lower pair
Higher pair
Cylindrical pair

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Theory of Machine
A mechanism _________ for transmitting or transforming motion.

Unpredictable
None of these
Can not be used
Can be used

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Theory of Machine
If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

180°
90°
360°
0°

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Theory of Machine
The secondary unbalanced force is maximum __________ in one revolution of the crank.

Two times
Four times
Eight times
Sixteen times

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

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Theory of Machine
If the pressure angle is __________, a reciprocating follower will jam in its bearings.

Too small
Large
Small
Too large

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