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Theory of Machine

Theory of Machine
Hart mechanism has

Four links
Twelve links
Eight links
Six links

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Theory of Machine
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Lower pair
Force-closed pair
Higher pair
Self-closed pair

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Theory of Machine
The relation between number of links (l) and number of joints (j) in a kinematic chain is

l = (1/2).(j + 2)
l = (3/4).(j + 3)
l = (2/3).(j + 2)
l = j + 4

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Theory of Machine
The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called

Coriolis component
Radial component
Tangential component
None of these

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Theory of Machine
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2.22 mm
3.0 mm
2 mm
2.50 mm

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Theory of Machine
A higher pair has__________.

No contact
Surface contact
Point contact
None of these

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