a$-$ Ball valve

b$-$Needle valve

c$-$Gate valve

d$-$Diaphragm valve

$13-$ Which principle is used for caloulating the center of pressure?

a$-$ Principle of momentum

b$-$ Principle of conservation of energy

c$-$ Principle of balancing of moment

d$-$None of the mentioned

$14-$ In our experiment head losses the lengh of pipe was $(1270mm).$the diameter was $(9mm),$ the flow rate was $(1\frac{L}{5}s)$ we calculte the friction losses $(0\mathrm{.}7m)$ if we incease the flow rate to $(2$L$/5$s$)$ the frition losses will be:

$15-$ Darcy formula is used in general to calculate friction losses when the flow regime is laminar

a$-$True

b$-$False

$16-$One of the major advantages of using diaphragm valves is that components can be isolated from the process fluid.

a$-$ True

b$-$False

$17-$ The flat vane in experiment impact of jet is used in turbines.

a$-$ True

b$-$ False

$18-$ At low suction pressure cavitation's could occur.

a$-$True b$-$False

$19-$ Orifice meter head losses are more than Rota meter head.

a$-$ True

b$-$False

$20-$ In centrifugal pump shaft power less than fluid power.

a$-$ True

b$-$ False