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Theory of Machine

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

Circle
Straight line
Parabola
Ellipse

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Theory of Machine
The values of velocity and acceleration of piston at near dead center for a slider-crank mechanism will be

0, and more than co2r
0, and less than coV
0, 0
cor, 0

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Theory of Machine
A rigid body possesses ________degrees of freedom

Four
One
Six
Two

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Theory of Machine
A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is

12,000 r.p.m.
9,360 r.p.m.
6,000 r.p.m.
5,367 r.p.m.

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Theory of Machine
For an involute gear, the ratio of base circle radius and pitch circle radius is equal to

secφ
cosφ
sinφ
cosecφ

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Theory of Machine
The factional torque for square thread at the mean radius r while raising load W is given by

T = W.r tanφ
T = W.r tan(φ - α)
T = W.r tanα
T = W.r tan(φ + α)

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