Correct option is B
The size of the shaper or planer is specified by the maximum length of the stroke. Because the maximum length of the stroke determines the maximum size (length) of the surface, which can be, machined on the shaper or planer. The normal maximum stroke length of shaper is 800 mm. For planers, the size is also specified by the size of the largest rectangular solid that can be machined on the planer. The width of the largest solid is limited by the distance between the two housings and the maximum height is determined by the distance between top of the table and the cross rail in its uppermost position.
The feed in a planing machine is the distance the tool travels at the beginning of each cutting stroke and is expressed in mm/double stroke.
Depth of cut is the thickness of metal removed in one cut, and is measured by the perpendicular distance between the machined and non-machined surfaces and is expressed in mm. If multiple tools cut a workpiece simultaneously, the total cutting time will not cumulate but MRR of each tool should be added to get total MRR.
