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Theory of Machine

Theory of Machine
The lower pairs are _________ pairs.

Self-closed
Force-closed
Friction closed
None of these

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

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

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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) cosφ]/2
[(r + R) sinφ]/2

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Theory of Machine
The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

l₂ = kG
l₁l₂ = kG
l₁l₂ = kG²
l₁ = kG

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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
The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

Vertically and perpendicular
Horizontally and parallel
Vertically and parallel
Horizontally and perpendicular

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