Theory of Machine
In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called

Steam lap
Lead
Exhaust lap
None of these

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
The Ackerman steering gear is most economical
The Ackerman steering gear consists of turning pairs
Both (A) and (B)

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Theory of Machine
In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

All of these
Cause withdrawing or throttling of steam
Reduce length of effective stroke of piston
Reduce maximum opening of port to steam

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