Problem $1$:

$1$A $($L$01/2$ points$)$ What is hydraulic diameter? How is it defined? What is it equal to for a circular pipe of diameter D$?$

Circle the correct answer $($L$02/$Each $1$ point$)$:

$1$B$)$ Consider fully developed flow in a circular pipe with negligible entrance effects. If the length of the pipe is doubled, the head loss will

$($a$)$ double $($b$)$ more than double, $($c$)$ less than double, $($d$)$ reduce by half, or $($e$)$ remain constant.

$1$C$)$ Head loss due to friction in a circular pipe of diameter $D,$ under laminar flow is inversely proportional to:

a$)D^3$

b$)D^2$

c$)D^5$

d$)D^4$

$1$D$)$ The difference between the total head line and hydraulic grade line represents the:

a$)$ Piezometric head b$)$ pressure head c$)$ Elevation head d$)$ Velocity head