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Theory of Machine

Theory of Machine
The critical speed of a shaft depends upon its

Mass
Stiffness
Stiffness and eccentricity
Mass and stiffness

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone)

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

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Theory of Machine
The mechanism in which two are turning pairs and two are sliding pairs, is called a

Elliptical trammel
Scotch yoke mechanism
All of these
Double slider crank chain

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Theory of Machine
When the particles of a body moves perpendicular to its axis, then the body is said to have

Transverse vibration
Longitudinal vibration
Torsional vibration
None of these

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Theory of Machine
In order to double the period of a simple pendulum, the length of the string should be

Halved
Quadrupled
Doubled
None of these

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Theory of Machine
A spring controlled governor is found unstable. It can be made stable by

Increasing the spring stiffness
Increasing the ball mass
Decreasing the ball mass
Decreasing the spring stiffness

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