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Theory of Machine

Theory of Machine
Which of the following is a higher pair?

Screw pair
Sliding pair
Turning pair
Belt and pulley

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Theory of Machine
Which of the following mechanisms produces mathematically an exact straight line motion?

Grasshopper mechanism
Watt mechanism
Peaucellier's mechanism
Tchebicheff mechanism

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Theory of Machine
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

Reduce slip
Reduce vibration
Ensure uniform loading
Ensure proper alignment

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Theory of Machine
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

ω² (R - r₁) cosθ
ω² r₁ sinθ
ω² R cosθ
ω² (R - r₁) sinθ

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Theory of Machine
The example of rolling pair is

Ball and socket joint
Lead screw of a lathe
Bolt and nut
Ball bearing and roller bearing

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Theory of Machine
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

α = 90° - φ
α = 45° + φ/2
α = 45° - φ/2
α = 90° + φ

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