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Theory of Machine

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

30
28
8
15

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Theory of Machine
The lower pairs are _________ pairs.

None of these
Self-closed
Force-closed
Friction closed

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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
Slightly less than 95 mm
45 mm
95 mm

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Theory of Machine
In an ideal machine, the output as compared to input is

More
May be less or more depending on efficiency
Less
Equal

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Theory of Machine
When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a

Screw pair
Spherical pair
Turning pair
Sliding pair

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Theory of Machine
Which of the following is an example of sliding pair?

Lead screw of a lathe with nut
Ball and a socket joint
Piston and cylinder of a reciprocating steam engine
Shaft with collars at both ends fitted into a circular hole

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