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391.

In a flow field, at the stagnation point

A.	pressure is zero	B.	total energy is zero
C.	pressure head is equal to velocity head	D.	All the velocity head is converted into pressure head

392.

In which of the following case of modelling, Reynold number will be used for studying?

A.	Hydraulic jump	B.	Flow configuration of harbours
C.	Flow of castor oil through pipes	D.	All of the above

393.

Ogee is

A.	overfall of a spillway in the shape of double or S-curve which is convex at the top and concave at the bottom	B.	the channel between the silt extractor and the river through which the escapage water is discharged
C.	the channel conducting water away from a water wheel	D.	none of the above

394.

Prandtl's mixing length hypothesis is based on

A.	eddy viscosity	B.	momentum exchange that occurs due to random motion
C.	similarity of turbulent flow pattern	D.	None of the above

395.

When the Reynolds number is less than 500 the flow is said to be laminar for

A.	pipe flow	B.	flow between parallel plates
C.	free surface flow	D.	all of the above

396.

In a sudden expansion in a pipe

A.	total energy line rises in the down-stream direction	B.	velocity head gradually increases
C.	piezometric head gradually rises in the downstream direction	D.	frictional resistance is negligible

397.

Separation is caused by

A.	an adverse pressure gradient	B.	boundary layer thickness reducing to zero
C.	laminar flow changing to turbulent flow	D.	all of the above

398.

Darcy's equation for flow through porous media valid as long as the flow remains

A.	steady	B.	critical
C.	laminar with negligible internal effects	D.	turbulent with negligible inertial effects.

399.

If one of the walls moves in the direction of flow with uniform velocity while the other wall is stationary, then the resulting flow between parallel walls is called

A.	Plug flow	B.	Stoke's flow
C.	Couette flow	D.	Euler's flow

400.

For a flow between two stationary parallel plates the velocity distribution is parabolic. In this case the mean velocity is equal to

A.	maximum velocity	B.	half the maximum velocity
C.	one-third of the maximum velocity	D.	two-third of the maximum velocity