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Theory of Machine

Theory of Machine
The tendency of a body to resist change from rest or motion is known as

Resisting force
Friction
Mass
Inertia

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Theory of Machine
A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

G².I₂
I₂/G²
G.I₂
I₂/G

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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
[(r + R) sinφ]/2
[(r + R) cosφ]/2
[(r² + R²) cosφ]/2

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Theory of Machine
The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is

At 45° to PO
Perpendicular to PO
Along PO
None of the listed here

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

30
28
15
8

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Theory of Machine
A spring controlled governor is found unstable. It can be made stable by

Increasing the ball mass
Decreasing the spring stiffness
Increasing the spring stiffness
Decreasing the ball mass

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