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Theory of Machine

Theory of Machine
If two moving elements have surface contact in motion, such pair is known as

Surface pair
Higher pair
Rolling pair
Sliding pair

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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

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

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Theory of Machine
In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by

ω sinθ/(n² - cos²θ)1/2
ω cosθ/(n² - cos²θ)1/2
ω cosθ/(n² - sin²θ)1/2
ω sinθ/(n² - sin²θ)1/2

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Theory of Machine
The relation between number of links (l) and number of joints (j) in a kinematic chain is

l = j + 4
l = (2/3).(j + 2)
l = (3/4).(j + 3)
l = (1/2).(j + 2)

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Theory of Machine
A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

Elliptical path
Hyperbolic path
Straight line path
Parabolic path

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Theory of Machine
Which gear is used for connecting two coplanar and intersecting shafts?

Bevel gear
None of these
Spur gear
Helical gear

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