Theory of Machine
Which type of gearing is used in steering system of an automobile?

Worm and wheel
Spiral gears
None of the listed here
Rack and pinion

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Theory of Machine
In a hydrodynamic journal bearing, there is

A forced lubricant between the journal and the bearing
A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
No lubricant between the journal and the bearing
A thick film of lubricant between the journal and the bearing

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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.
The friction force is directly proportional to the normal force.
All of these

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