Manufacturing And Production Technology - Study Mode

[#211] What is the type of welding defect caused due to poor deposition of weld rod is called?
Correct Answer

(A) Porosity

[#212] A single point tool has
Correct Answer

(D) All of these

[#213] A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is
Correct Answer

(C) 20 mm

[#214] An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is
Correct Answer

(C) Shear angle

[#215] The point angle of a drill, for drilling stainless steel, is
Correct Answer

(C) 135°

Explanation

Solution: The point angle is located at the head of the twist drill.
For hard materials such as stainless steel, the point angle should be large and e.g. 130° or 135°.
For soft materials, point angles of e.g. 118° are used.
With a large point angle, more of the cutting edge engages in the workpiece when drilling