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Theory of Machine

Theory of Machine
The minimum force required to slide a body of weight W on a rough horizontal plane is

W sinθ
W tanθ
W cosecθ
W cosθ

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Theory of Machine
Flexible coupling is used because

It is easy to engage and disengage
It prevents shock transmission and eliminates stress reversals
It is easy to disassemble
It transmits shocks gradually

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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

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

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Theory of Machine
A circle passing through the pitch point with its center at the center of cam axis is known as

Base circle
Pitch circle
Outer circle
Prime circle

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Theory of Machine
The approximate straight line mechanism is a

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

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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)

Zero
Greater than unity
Less than unity
Equal to unity

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