Fluid Mechanics

181. The upper surface of a weir over which water flows is known is

  1. crest
  2. nappe
  3. sill
  4. weir top
  5. contracta.

Correct answer: (C)
sill

182. The value of mass density in kgsecVm4 for water at 0°C is

  1. 1
  2. 1000
  3. 100
  4. 101.9
  5. 91

Correct answer: (D)
101.9

183. The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to

  1. 1000
  2. 2100
  3. 2700
  4. 10000
  5. 21000

Correct answer: (E)
21000

184. The vapour pressure over the concave surface is

  1. less man the vapour pressure over the plane surface
  2. equal to the vapour pressure over the plane surface
  3. greater than the vapour pressure over the plane surface
  4. zero
  5. none of the above.

Correct answer: (A)
less man the vapour pressure over the plane surface

185. The velocity of jet of water travelling out of opening in a tank filled with water is proportional to

  1. head of water (h)
  2. h2
  3. V/T
  4. h2
  5. h3/1.

Correct answer: (C)
V/T

186. The volumetric change of the fluid caused by a resistance is known as

  1. volumetric strain
  2. volumetric index
  3. compressibility
  4. adhesion
  5. cohesion.

Correct answer: (C)
compressibility

187. To avoid an interruption in the flow of a syphon, an air vessel is provided

  1. at the inlet
  2. at the outlet
  3. at the summit
  4. ay nay point between inlet and outlet
  5. none of the above.

Correct answer: (C)
at the summit

188. To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than

  1. 2.4 m above the hydraulic gradient
  2. 6.4 m above the hydraulic gradient
  3. 10.0 m above the hydraulic gradient
  4. 5.0 above the hydraulic gradient
  5. none of the above.

Correct answer: (B)
6.4 m above the hydraulic gradient

189. Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be

  1. 1000 kg
  2. 4000 kg
  3. 2000 kg
  4. 8000 kg
  5. 16000 kg.

Correct answer: (A)
1000 kg

190. True one-dimensional flow occurs when

  1. the direction and magnitude of the veiocity at all points are identical
  2. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
  3. the magnitude and direction of the velocity do not change from point to point in the fluid
  4. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
  5. velocity, depth, pressure etc. change from point to point in the fluid flow.

Correct answer: (A)
the direction and magnitude of the veiocity at all points are identical

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