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Theory of Machine

Theory of Machine
Which of the following mechanism is obtained from lower pair?

Valve and valve gears
Gyroscope
Pantograph
All of these

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Theory of Machine
When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be

Unstable
Stable
Isochronous
None of these

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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

Turning pair
Sliding pair
Screw pair
Spherical pair

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Theory of Machine
The number of links and instantaneous centers in a reciprocating engine mechanism are

4, 6
4, 5
4, 4
5, 4

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Theory of Machine
The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where l = Number of links, and j = Number of binary joints)

n = 2(l - 1) - 2j
n = (l -1) - j
n = 4(l - 1) - 3j
n = 3(l - 1) - 2j

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Theory of Machine
In a shaper mechanism, the Coriolis component of acceleration will

Exist
Not exist
Depend on position of crank
None of these

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