engineering recuitment AAI JE Technical Mock Test 2020-21 Production Engineering (Manufacturing) Metal Forming Sheet Metal Operation
A hole is to be punched in a 15 mm thick plate having an ultimate shear strength of 6 N/mm2. If the allowable crushing stress in the punch is 12 N/mm2, the diameter of the smallest hole which can be punched is equal to
1
15
2
30
3
60
4
120