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Theory of Machine

Theory of Machine
A mechanism _________ for transmitting or transforming motion.

None of these
Can not be used
Can be used
Unpredictable

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

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

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.

None of these
More
Same
Less

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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

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

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Theory of Machine
The maximum or minimum value of the swaying couple is

± c.m.ω².r
± a (1 - c) m.ω².r
± 2a (1 - c) m.ω².r
± (a/√2) (1 - c) m.ω².r

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Theory of Machine
The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

Vertically and perpendicular
Vertically and parallel
Horizontally and parallel
Horizontally and perpendicular

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