GATE 2023 || Manufacturing & Engineering materials || Quiz 64

In a rolling process, thickness of a strip is reduced from 4 mm to 2 mm using 300 mm diameter rolls rotating at 100 rpm. The velocity of the strip (in m/sec) at the neutral point is __________.

A 20 mm thick plate is rolled with identical rolls of 400 mm diameter to reduce its thickness to 5 mm. If the friction coefficient at the work-roll interface is 0.15, then minimum number of passes required is

In an extrusion process, let R=extrusion ratio and r=fractional reduction in the area.

The correct relation between R and r is :

In a extrusion process billet having diameter 550 mm is extruded, where. The extrusion force required is 35 MN. diameter of extrusion (mm) is? (Extrusion constant = 200 MPa)