The expected efficiency of a single rivetted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.?

The expected efficiency of a single rivetted lap joint is of the order

1.	The expected efficiency of a single rivetted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.?
A.	Two
B.	Four
C.	Six
D.	Eight
Answer» B. Four