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Theory of Machine

Theory of Machine
Typewriter constitutes

Mechanism
Machine
Inversion
Structure

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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
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2.50 mm
3.0 mm
2.22 mm
2 mm

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Theory of Machine
According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centers will lie on a

Rectangle
Triangle
Parabolic curve
Straight line

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Theory of Machine
When the sleeve of a Porter governor moves downwards, the governor speed

Decreases
Remain unaffected
First increases and then decreases
Increases

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Theory of Machine
For fluctuating loads, well suited bearing is

Roller bearing
Needle roller bearing
Ball bearing
Thrust bearing

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