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Theory of Machine

Theory of Machine
The mechanism forms a structure, when the number of degrees of freedom (n) is equal to

-1
1
2

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Theory of Machine
A rigid body possesses ________degrees of freedom

Two
Four
One
Six

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Theory of Machine
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

α = 45° - φ/2
α = 90° + φ
α = 90° - φ
α = 45° + φ/2

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Theory of Machine
Any point on a link connecting double slider crank chain will trace a

Parabola
Circle
Straight line
Ellipse

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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.

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

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Theory of Machine
If the number of links in a mechanism is equal to l, then the numbers of possible inversions are equal to

l - 2
l
l - 1
l + 1

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