top of page

Fluid Mechanics (301-320)

Updated: Apr 22, 2020

301.In the set up shown in Fig, assuming the specific weight of water as 10,000

N/m³ the pressure difference between the points A and B will be


-10 N/m²

 

302 .Pumps in series operation allow the head to increase

Pumps in parallel operation increase the flow rate.

 

303. Which one of the following can be a set of velocity components of a two-dimensional flow? u = x + y and v = x - y

 

304 Specific Speed

A. Pelton 25

B. Propeller 900

C. Kaplan 800

D. Francis 75

 

305. The height of a hydraulic jump in a stilling pool was found to be 10 cm in a

model with l/l =36. The prototype jump height would be 3.6 m


 

306. To generate 10,000 hp under a head of 81 m while working at a speed of

500 rpm, the turbine of choice would be Francis


 

307 Runaway speed of a turbine is generally 180% of normal speed

Underground power stations are suited to areas susceptible to land slides

 

308. A pressure increase of 200 N/cm² increases the density of water by 0.1%.

The bulk modulus of elasticity of water is equal to 2 GN/m²

 

309. A Bourdon gauge measures the pressure at a point relative to the local atmospheric pressure and not relative to the standard atmospheric pressure

 

310. A slab of wood 4 m by 4 m by 1 m (height), specific gravity 0.50 floats in

water with 400 kg mass on it. The volume of the slab submerged , in cubic metres, is 8.4

 

311. Two small circular orifices of diameters d and d respectively are placed on one side of a tank at depths of 25 cm and 1 m below a constant surface of water. If the discharges through the orifices are the same, then the ratio of the diameter d and d will be 2:1


 

312. The streamlines of a flow net are concentric circles. If the velocity at a

radius of 0.6 m is 2.7 m/s, the velocity at a radius of 0.9 m will be 1.8 m/s

 

313.The following stream function will represent/satisfy



irrotational flow, Laplace equation and equation of continuity

 

314. Streamlines and equipontential lines are orthogonal wherever they meet


 

315. The time required to empty a concrete tank through a rectangular weir at the side from a head of 16 cm to 8 cm over the crest was found to be 16 minutes. The

time required to empty it further up to the crest will be Infinite


 

316. If two geometrically similar models having a scale ratio L are operated in a

given laboratory at the same Froude number, then all the corresponding

accelerations will be in the ratio of l


 

317. In the distored model of a river, the horizontal and vertical scale ratios are L

and L respectively. The discharge ratio will be

Lₕ Lᵥ³/²


 

318.











 

319. At the same mean velocity, the ratio of head loss per unit length for a sewer pipe flowing full to that for the same pipe flowing half full would be 1.0

 

320. The velocity of a pressure wave in water hammer is equal to the velocity of sound in water. Is this statement correct ?

No, because, the elasticity of the pipe reduces the velocity of the pressure

wave

142 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