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Theory of Machine

Theory of Machine
The maximum value of the pressure angle in case of cam is kept as

10°
14°
30°
20°

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Theory of Machine
Which of the following mechanism is an approximate straight line motion mechanism?

Robert's mechanism
Grasshopper mechanism
Watt's mechanism
All of these

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Theory of Machine
When the crank is at the inner dead center, in a reciprocating steam engine, then the acceleration of the piston will be

ω²r. n/(n + 1)
ω²r. (n + 1)/n
ω²r. (n - 1)/n
ω²r. n/(n - 1)

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Theory of Machine
When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than

0.25
0.5
2
1

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Theory of Machine
A kinematic chain requires at least

2 links and 3 turning pairs
5 links and 4 turning pairs
4 links and 4 turning pairs
3 links and 4 turning pairs

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Theory of Machine
The approximate straight line mechanism is a

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

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