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Theory of Machine

Theory of Machine
The primary unbalanced force is maximum _________ in one revolution of the crank.

Twice
Four times
Sixteen times
Eight times

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is

(1/2) μ W R cosecα
μ W R cosecα
(3/4) μ W R cosecα
(2/3) μ W R cosecα

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Theory of Machine
When a slider moves on a fixed link having curved surface, their instantaneous centre lies

At the pin joint
At the centre of curvature
At the centre of circle
On their point of contact

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Theory of Machine
The locus of a point on a thread unwound from a cylinder will be

A straight line
Involute
A circle
Cycloidal

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Theory of Machine
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

3.0 mm
2.22 mm
2 mm
2.50 mm

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Theory of Machine
If the damping factor for a vibrating system is unity, then the system will be

Under damped
Without vibrations
Critically damped
Over damped

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