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Theory of Machine

Theory of Machine
Shaft revolving in a bearing is the following type of pair

Cylindrical pair
Spherical pair
Higher pair
Lower pair

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Theory of Machine
Module of a gear is

2D/T
T/D
2T/D
D/T

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

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

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Theory of Machine
The example of completely constrained motion is a

All of these
Motion of a shaft with collars at each end in a circular hole
Motion of a square bar in a square hole
Motion of a piston in the cylinder of a steam engine

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Theory of Machine
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

ω (r₁ + r₂) cosθ cosec2θ
ω (r₁ r₂) cosθ
ω (r₁ r₂) sinθ
ω (r₁ + r₂) sinθ sec2θ

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Theory of Machine
Which one of the following is an exact straight line mechanism using lower pairs?

Robert’s mechanism
Watt’s mechanism
Grasshopper mechanism
Peaucellier’s mechanism

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