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Theory of Machine

Theory of Machine
In a rigid link OA, velocity of 'A' w.r.t. 'O' will be

Parallel to OA
Along AO
At 45° to OA
Perpendicular to OA

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Theory of Machine
The factional torque for square thread at the mean radius r while raising load W is given by

T = W.r tanα
T = W.r tan(φ - α)
T = W.r tanφ
T = W.r tan(φ + α)

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Theory of Machine
Pulley in a belt drive acts as

Cylindrical pair
Rolling pair
Sliding pair
Turning pair

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Theory of Machine
Which of the below are inversions of slider crank mechanism? 1. Oscillating cylinder engine mechanism 2. Toggle mechanism 3. Radial cylinder engine mechanism 4. Quick return mechanism

2, 3 and 4
1, 3 and 4
1, 2 and 3
1, 2 and 4

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Theory of Machine
The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)

cotα = c/2b
sinα = b/c
tanα = c/2b
cosα = c/b

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Theory of Machine
Instantaneous center of rotation of a link in a four bar mechanism lies on

Can’t occur
Right side pivot of this link
A point obtained by intersection on extending adjoining links
Left side pivot of this link

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