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Theory of Machine

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

D₁/D₂
D₂/D₁
D₁
D₁.D₂

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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
In an open pair, the two elements of a pair

Are not held together mechanically
Have a surface contact when in motion
Have a line or point contact when in motion
Are kept in contact by the action of external forces, when in motion

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Theory of Machine
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

ω² R cosθ
ω² (R - r₁) sinθ
ω² (R - r₁) cosθ
ω² r₁ sinθ

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Theory of Machine
Bifilar suspension method is used to find the

Frequency of vibration of the body
Periodic time of the body
Moment of inertia of the body
Angular acceleration of the body

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Theory of Machine
The frictional torque transmitted by a disc or plate clutch is same as that of

Conical pivot bearing
Flat pivot bearing
Truncated conical pivot bearing
Flat collar bearing

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