Manufacturing Rapid Quiz (App update required to attempt this test)

A 6 mm thick sheet is rolled to 3 mm with a pair of roller having diameter 300mm. The friction coefficient at the work roll interface is 0.1, the maximum number of passes required ____

Resistance spot welding is performed on two plates of 1.5 mm thickness with 6 mm diameter electrode, using 15000 A current for a time duration of 0.25 seconds. Assuming the interface resistance to be 0.0001Ω, the heat generated( W-sec) to form the weld is

For cutting a rectangular blank of 50 mm × 200 mm from a sheet of 1 mm thickness (mild steel, shear strength= 240 N/mm²). The required force for blanking operation is _____ kN.