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Theory of Machine

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

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

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Theory of Machine
The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the center of gravity is equal to the radius of gyration of the body about its center of gravity.

Minimum
Maximum
None of these
Zero

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Theory of Machine
The Bifilar suspension method is used to determine

Moment of inertia
Natural frequency of vibration
Centripetal acceleration
Position of balancing weights

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

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Theory of Machine
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

8 fn
2 fn
4 fn
fn/2

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

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

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