In sheet metal working, the spring back increase when P. Ratio of bend radius to sheet thickness is small Q. Young's modulus of the sheet is low R. Yieid strength of the sheet is high S. Tension is applied during bending

In sheet metal working, the spring back increase when P. Ratio of bend

1.	In sheet metal working, the spring back increase when P. Ratio of bend radius to sheet thickness is small Q. Young's modulus of the sheet is low R. Yieid strength of the sheet is high S. Tension is applied during bending
A.	P, Q, R
B.	Q, R
C.	P, Q, S
D.	P, R, S
Answer» B. Q, R

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In sheet metal working, the spring back increase when P. Ratio of bend radius to sheet thickness is small Q. Young's modulus of the sheet is low R. Yieid strength of the sheet is high S. Tension is applied during bending

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