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Theory of Machine

Theory of Machine
The relative velocity of B with respect to A in a rigid link AB is

Along AB
Parallel to AB
At 45° to AB
Perpendicular to AB

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Theory of Machine
In a steam engine, the link constitutes a

Piston, piston rod and cross-head
Crank pin, crankshaft and flywheel
Connecting rod with big and small end brasses, caps and bolts
All of these

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Theory of Machine
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

Ensure uniform loading
Reduce slip
Ensure proper alignment
Reduce vibration

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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)

Equal to unity
Zero
Less than unity
Greater than unity

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Theory of Machine
Pulley in a belt drive acts as

Turning pair
Rolling pair
Cylindrical pair
Sliding pair

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)

¾μWR
μwr
²/₃ μWR
½μWR

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