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Theory of Machine

Theory of Machine
The relation between number of pairs (p) forming a kinematic chain and the number of links (l) is

l = 2p - 2
l = 2p - 4
l = 2p - 3
l = 2p - 5

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Theory of Machine
To obviate axial thrust, following gear drive is used

Mutter gears
Double helical gears having identical teeth
Double helical gears having opposite teeth
Single helical gear in which one of the teeth of helix angle a is more

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Theory of Machine
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

Not possible to determine with these data
Joining the corresponding points
Perpendicular to line as per (A)
At 45° to line as per (A)

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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
Clearance
Working depth
Dedendum

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Theory of Machine
If the damping factor for a vibrating system is unity, then the system will be

Critically damped
Without vibrations
Over damped
Under damped

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

μ W R
(3/4) μ W R
(1/2) μ W R
(2/3) μ W R

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