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Theory of Machine

Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

30
15
28
8

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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

4 fn
2 fn
fn/2
8 fn

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Theory of Machine
Critical damping is a function of

Damping coefficient and natural frequency
Mass and stiffness
Mass and damping coefficient
Mass and natural frequency

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

45 mm
Slightly less than 45 mm
Slightly more than 45 mm
95 mm

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Theory of Machine
The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body, and δ = Static deflection of the body)

1/2π × √(s/m)
1/2π × √(g/δ)
Any one of the listed here
0.4985/√δ

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Theory of Machine
In an ideal machine, the output as compared to input is

Less
More
Equal
May be less or more depending on efficiency

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