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Theory of Machine

Theory of Machine
If there are L number of links in a mechanism, then number of possible inversions is equal to

L
L + 1
L - 1
L + 2

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Theory of Machine
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

ω² R cosθ
ω² r₁ sinθ
ω² (R - r₁) sinθ
ω² (R - r₁) cosθ

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Theory of Machine
A mechanism consisting of four links is called a __________ mechanism.

Simple
Compound
Binary
None of these

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Theory of Machine
The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)

tanφ + cotα = b/c
cotφ - cotα = c/b
cosφ - sinα = c/b
sinφ + sinα = b/c

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Theory of Machine
A slider crank chain consists of following numbers of turning and sliding pairs

3, 1
1, 3
4, 0
2, 2

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Theory of Machine
The rotating shafts tend to vibrate violently at whirling speeds because

The system is unbalanced
Bearing centre line coincides with the axis
The shafts are rotating at very high speeds
Resonance is caused due to the heavy mass of the rotor

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