Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â causes hoop tension in pipe shell.

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â causes ho

1.	Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â causes hoop tension in pipe shell.
A.	internal water pressure
B.	external water pressure
C.	water hammer
D.	longitudinal stress
Answer» B. external water pressure