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Theory of Machine

Theory of Machine
If the number of links in a mechanism is equal to l, then the numbers of possible inversions are equal to

l - 2
l - 1
l + 1
l

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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
4 fn
2 fn
fn/2

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Theory of Machine
The instantaneous centers which vary with the configuration of mechanism are called

Fixed instantaneous centers
Permanent instantaneous centers
None of these
Neither fixed nor permanent instantaneous centers

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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

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

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Theory of Machine
When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

π
Zero
One
π/2

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Theory of Machine
The Ackermann steering mechanism is preferred to the Davis type in automobiles because

The former is most economical
The former is mathematically accurate
The former is having turning pair
The former is most rigid

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