top of page

Fluid Mechanics (341-360)

Updated: Apr 23, 2020

341. The standard step method of gradually varied flow computations involves the

application of continuity and energy equations


342.A. Positive surge travelling upstream-Occurs on upstream of gate that is partly closed suddenly B. Positive surge travelling downstream-Occurs on downstream of gate that is partly open suddenly C. Negative surge travelling upstream-Occurs on upstream of gate that is partly open suddenly D. Negative surge travelling downstream-Occurs on downstream of gate that is partly closed suddenly


343.relate to water surface profiles in gradually varied flow of an open channel.

M and S curves meet y line asymptotically and tend to be horizontal as y -

C and C curves will be slightly curved if Chezy's equation is used.

Otherwise, they tend to be straight lines.


344. In a supersonic flow, a diverging passage results in decrease in pressure and density


345. In a normal shock wave in a one dimensional flow, the

pressure,density and temperature increases


346. A three-dimensional state of stress can be split into the two components, the

hydrostatic state and the deviatoric component. Then magnitude of the

hydrostatic state pressure is given by


347. In a two-dimensional incompressible flow, if the fluid velocity components are

given by u = x - 4y, v = -y - 4x then the stream function ψ is given by


348. Which of the following equations will be satisfied by irrotational • flow of ~an

incompressible fluid ?


349. A circular surface area 200 cm² is inclined to the x and y axes such that the unit vector normal to the surface is given by n = 0.4i + 0.3j. If a force of 2000 kg acts on the x-axis, then the normal stress on the surface will be

5 kg/cm²


350. Given the x-component of the velocity u = 6xy - 2x2, the y-component of the

flow v is given by 4xy-3y²


351. A jet of water issues from a 5 cm diameter nozzle, held vertically upwards, at a

velocity of 20 m/sec. If air resistance consumes 10% of the initial energy of the

jet, then it would reach a height; above the nozzle, of 18.35 m


352. The ratio of pressures between two points A and B located respectively at depths 0.5 m and 2 m below a constant level of water in a tank is 1:4


353.A wooden plank (sp. gr. 0.5) 1 m x lm x 0.5 m floats in water with 1.5 kN load on

it with 1 m x 1 m surface horizontal. The depth of plank lying below water surface

shall be 0.403 m


354.Which of the following assumptions are made in the analysis of jet impinging

normally on a moving plate ?

1. Friction between jet and plate is neglected.

2. Flow is steady.

3. Plate moves at a constant velocity.


355.A Rankine (oval) half body PP is subjected to a two dimensional flow (x, y

coordinate directions from origin O) with uniform velocity V, resulting in typical

streamlines as shown in Fig by dotted lines

The point A on the body surface is

stagnation point




357. The head loss in a pipe of diameter d, carrying oil at a flow rate Q over a

distance 1 is h. The pipe is replaced by another with half the diameter, all other

things remaining the same. The head loss in this case will be 32.0 h




359. The discharge per metre width at the foot of a spillway is 10 m3/s at a velocity of 20 m/s. A perfect free hydraulic jump will occur at the foot of the spillway when the tail water depth is approximately equal to 6.50 m


360. The differential equation for energy for a reversible adiabatic flow may take the form

42 views0 comments

Recent Posts

See All

साधारण समझ में सीमेंट एक बंधक पदार्थ (Binding material) है। Cement एक प्रकार का संसजन और असंजन (Cohession & adhesion) गुणों वाला बंधक पदार्थ है। जो ठोस के कणों को अपने साथ-2 बांधने में सक्षम होता है।

bottom of page