Theory of Machine
The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

0° and 90°
Both (A) and (B)
None of these
180° and 360°

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

The friction force is independent of me area of contact.
The friction force is directly proportional to the normal force.
The friction force is dependent on the materials of the contact surfaces.
All of these

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