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Theory of Machine

Theory of Machine
A pulley and belt in a belt drive form a

Turning pair
Rolling pair
Cylindrical pair
Sliding pair

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Theory of Machine
The ratio of the number of teeth to the pitch circle diameter in millimeters, is called

Diametral pitch
Circular pitch
Module
None of these

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

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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

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

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone)

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

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Theory of Machine
An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be

600°K
650°K
700°K
625°K

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