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Theory of Machine

Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

30
8
15
28

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Theory of Machine
The relation between number of pairs (p) forming a kinematic chain and the number of links (l) is

l = 2p - 2
l = 2p - 4
l = 2p - 5
l = 2p - 3

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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 less than 95 mm
45 mm
Slightly more than 95 mm

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Theory of Machine
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

(S₁ - S₂) / 2h
(S₁ + S₂) / 2h
(S₁ + S₂) / h
(S₁ - S₂) / h

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Theory of Machine
The purpose of a link is to

Transmit motion
Guide other links
All of these
Act as a support

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Theory of Machine
The motion between a pair which takes place in ____ is known as incompletely constrained motion.

None of the listed here
Two directions only
One direction only
More than one direction

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