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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.D₂
D₁

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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 distance between fixed pivots of crank and followers is

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

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Theory of Machine
Longitudinal vibrations are said to occur when the particles of a body moves

Perpendicular to its axis
Parallel to its axis
In a circle about its axis
None of these

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Theory of Machine
The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

2
4
1
3

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Theory of Machine
The axis of precession is __________ to the plane in which the axis of spin is going to rotate.

None of these
Perpendicular
Parallel
Both A and B

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

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

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