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Theory of Machine

Theory of Machine
When one of the links of a kinematic chain is fixed, the chain is known as a

Structure
Inversion
Machine
Mechanism

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Theory of Machine
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

180°
360°
90°
0°

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Theory of Machine
Which of the following is an open pair?

Cam and follower
Journal bearing
Ball and socket joint
Lead screw and nut

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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)

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

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Theory of Machine
When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a

Governor
Flywheel
D-slide valve
Meyer's expansion valve

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Theory of Machine
Efficiency of a screw jack is given by

tan (α - φ)/tanα
tanα/tan (α +φ)
tanα/tan (α - φ)
tan (α + φ)/tanα

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