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Theory of Machine

Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

8
28
30
15

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Theory of Machine
To obviate axial thrust, following gear drive is used

Double helical gears having identical teeth
Single helical gear in which one of the teeth of helix angle a is more
Double helical gears having opposite teeth
Mutter gears

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Theory of Machine
Which of the following is an inversion of a double slider crank chain?

All of these
Oldham's coupling
Scotch yoke mechanism
Elliptical trammel

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

Stiffness and eccentricity
Stiffness
Mass
Mass and stiffness

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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) cosφ]/2
[(r + R) sinφ]/2

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Theory of Machine
An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called

Addendum circle
Dedendum circle
Pitch circle
Clearance circle

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