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Theory of Machine

Theory of Machine
Which of the following is an open pair?

Lead screw and nut
Ball and socket joint
Cam and follower
Journal bearing

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Theory of Machine
A spring controlled governor is said to be isochronous when the controlling force

Remain constant for all radii of rotation
Increases as the radius of rotation decreases
Increases as the radius of rotation increases
Decreases as the radius of rotation increases

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Theory of Machine
The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be

To raise the bow and stern
To lower the bow and stern
To raise the stern and lower the bow
To raise the bow and lower the stern

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Theory of Machine
In higher pair, the relative motion is

Combination of sliding and turning
Purely turning
Purely sliding
Purely rotary

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Theory of Machine
The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is

h²/(kG² + h²)
(kG² + h²)/h
(kG² + h²)/h²
h/(kG² + h²)

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Theory of Machine
A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

I₂/G
G.I₂
I₂/G²
G².I₂

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