Theory of Machine
Transmission of power from the engine to the rear axle of an automobile is by means of

Hooke's joint
Worm and wheel method
Compound gears
Crown gear

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

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Theory of Machine
Crowning on pulleys helps

Increase belt and pulley life
In increasing velocity ratio
In decreasing the slip of the belt
For automatic adjustment of belt position so that belt runs centrally

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