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Theory of Machine

Theory of Machine
The number of centers in a crank driven slider crank mechanism is

2
4
6

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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)

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

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Theory of Machine
Instantaneous center of rotation of a link in a four bar mechanism lies on

Left side pivot of this link
Right side pivot of this link
A point obtained by intersection on extending adjoining links
Can’t occur

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Theory of Machine
The factional torque for square thread at the mean radius r while raising load W is given by

T = W.r tan(φ + α)
T = W.r tanα
T = W.r tan(φ - α)
T = W.r tanφ

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

95 mm
Slightly less than 45 mm
Slightly more than 45 mm
45 mm

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

Critically damped
Without vibrations
Over damped
Under damped

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