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Theory of Machine

Theory of Machine
In a shaper mechanism, the Coriolis component of acceleration will

Exist
None of these
Depend on position of crank
Not exist

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Theory of Machine
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.

None of these
Real
Equal
Complex conjugate

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Theory of Machine
If ‘D₁’ and ‘D₂’ be the diameters of driver and driven pulleys, then belt speed is proportional to

D₁
D₁/D₂
D₂/D₁
D₁.D₂

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

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

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Theory of Machine
Whirling speed of the shaft is the speed at which

Combination of transverse and longitudinal vibration occurs
Shaft tends to vibrate vigorously in transverse direction
Torsional vibrations occur
Shaft tends to vibrate in longitudinal direction

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Theory of Machine
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

fn/2
4 fn
8 fn
2 fn

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