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Theory of Machine

Theory of Machine
In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is

180°
0°
270°
90°

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Theory of Machine
In a spring controlled governor, when the controlling force ____ as the radius of rotation increases, it is said to be a stable governor.

Remains constant
Increases
None of the listed here
Decreases

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Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

r cosφ
(r/2) cosφ
r sinφ
r tanφ

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Theory of Machine
________ is an inversion of Double slider crank chain.

Scotch yoke mechanism
Coupling rod of a locomotive
Hand pump
Reciprocating engine

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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
The ratio of the driving tensions for V-belts is __________ times that of flat belts.(Where β = Semi-angle of the groove)

cosecβ
secβ
cosβ
sinβ

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