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Theory of Machine

Theory of Machine
The lower pair is a

Point contact pair
Closed pair
Open pair
Sliding pair

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Theory of Machine
A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having I 40 kg m2. The resultant speed after ing will be

100 RPM
90 RPM
data are insufficient
80 RPM

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Theory of Machine
The magnitude of linear velocity of a point B on a link AB relative to point A is, (Where ω = Angular velocity of the link AB)

ω × (AB)²
ω × AB
(ω × AB)²
ω² × AB

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Theory of Machine
The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called

Addendum
Working depth
Dedendum
Clearance

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Theory of Machine
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m). (dx/dt) + (s/m). x = 0. If the roots of this equation are real, then the system will be

Over-damped
Without vibrations
Critically damped
Under damped

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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)

l₁ = kG
l₁l₂ = kG²
l₂ = kG
l₁l₂ = kG

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