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Theory of Machine

Theory of Machine
If two moving elements have surface contact in motion, such pair is known as

Higher pair
Surface pair
Sliding pair
Rolling pair

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Theory of Machine
The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load)

0.6253/ √δS
0.571/ √δS
0.5615/ √δS
0.4985/ √δS

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Theory of Machine
A pulley and belt in a belt drive form a

Rolling pair
Sliding pair
Cylindrical pair
Turning pair

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

ω² r {(n - 1)/n}
ω² r {n/(n - 1)}
ω² r {n/(n + 1)}
ω² r {(n + 1)/n}

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Theory of Machine
The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

2
4
3
1

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Theory of Machine
A Hartnell governor is a

Spring loaded governor
Pendulum type governor
Inertia governor
Dead weight governor

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