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Theory of Machine

Theory of Machine
The Hooke's joint consists of:

Three forks
One fork
Four forks
Two forks

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Theory of Machine
Klein's construction is useful to determine

Angular acceleration of various parts
Displacement of various parts
Acceleration of various parts
Velocity of various parts

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

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Theory of Machine
For the same lift and same angle of ascent, a smaller base circle will give

Something else
A large value of pressure angle
There is no such relation with pressure angle
A small value of pressure angle

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

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

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

45 mm
Slightly less than 45 mm
Slightly more than 45 mm
95 mm

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