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

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

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Two lower pairs and two additional links
Any one of these
One lower pair and two additional links
Two lower pairs and one additional link

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