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Theory of Machine

Theory of Machine
A pantograph is a mechanism with

Turning pairs
Rolling pairs
Lower pairs
Higher pairs

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Theory of Machine
In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)

Less than unity
Zero
Greater than unity
Equal to unity

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Theory of Machine
A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

W CS / 2CE
2 W CE / CS
W CE / CS
W CE / 2CS

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Theory of Machine
Which of the following mechanisms produces mathematically an exact straight line motion?

Watt mechanism
Grasshopper mechanism
Peaucellier's mechanism
Tchebicheff mechanism

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Theory of Machine
The unbalanced primary forces in a reciprocating engine are

Balanced completely
Not balanced
Balanced by secondary forces
Balanced partially

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Theory of Machine
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

Radius of journal
Clearance between journal and bearing
Angular velocity of journal
Magnitude of the forces on journal

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