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Theory of Machine

Theory of Machine
In a ball bearing, ball and bearing forms a

Rolling pair
Screw pair
Turning pair
Spherical pair

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Theory of Machine
In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

To start the locomotive quickly
Minimize the effect of secondary forces
Minimize the effect of primary forces
Have perfect balancing

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Theory of Machine
Which of the following is a spring controlled governor?

Hartnell governor
Wilson-Hartnell governor
Hartung governor
All of these

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Theory of Machine
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

Not possible to determine with these data
At 45° to line as per (A)
Joining the corresponding points
Perpendicular to line as per (A)

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Theory of Machine
Creep in belt drive is due to

Uneven extensions and contractions due to varying tension
Material of the pulley
Material of the belt
Larger size of the driver pulley

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Theory of Machine
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)

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

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