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Theory of Machine

Theory of Machine
The approximate straight line mechanism is a

6 bar linkage
3 bar linkage
8 bar linkage
Four bar linkage

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Theory of Machine
The dynamic friction is the friction experienced by a body, when the body

Is at rest
None of these
Just begins to slide over the surface of the other body
Is in motion

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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

2 fn
fn/2
8 fn
4 fn

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Theory of Machine
Kinematic pairs are those which have two elements that

Are held together
Permit relative motion
Have line contact
Have surface contact

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Theory of Machine
In S.H.M., acceleration is proportional to

Velocity
All of these
Rate of change of velocity
Displacement

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Theory of Machine
There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

12
4/15
1/24
1/8

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