Hydraulic and Fluid Mechanics

181. In an internal mouthpiece, the absolute pressure head at vena contracta is

  1. Less than
  2. More than
  3. Equal to
  4. None of these

Correct answer: (A)
Less than

182. In an isothermal atmosphere, the pressure

  1. Decreases linearly with elevation
  2. Remain constant
  3. Varies in the same way as the density
  4. Increases exponentially with elevation

Correct answer: (C)
Varies in the same way as the density

183. In case of flow through parallel pipes,

  1. The head loss for all the pipes is same
  2. The total discharge is equal to the sum of discharges in the various pipes
  3. The total head loss is the sum of head losses in the various pipes
  4. Both (A) and (B)

Correct answer: (D)
Both (A) and (B)

184. In one dimensional flow, the flow

  1. Is steady and uniform
  2. Takes place in straight line
  3. Takes place in curve
  4. Takes place in one direction

Correct answer: (B)
Takes place in straight line

185. In open channels, the specific energy is the

  1. Total energy per unit discharge
  2. Total energy measured with respect to the datum passing through the bottom of the channel
  3. Total energy measured above the horizontal datum
  4. Kinetic energy plotted above the free surface of water

Correct answer: (B)
Total energy measured with respect to the datum passing through the bottom of the channel

186. In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than

  1. Frictional force
  2. Viscosity
  3. Surface friction
  4. All of the above

Correct answer: (D)
All of the above

187. In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be

  1. 1/16 to 1/8
  2. 1/8 to 1/4
  3. 1/4 to 1/3
  4. 1/3 to 1/2

Correct answer: (D)
1/3 to 1/2

188. In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle. Sensitivity of inclined tube to sensitivity of U-tube is equal to

  1. Sinθ
  2. 1/Sinθ
  3. Cosθ
  4. 1/Cosθ

Correct answer: (B)
1/Sinθ

189. In order to measure the flow with a Venturimeter, it is installed in

  1. Horizontal line
  2. Inclined line with flow upwards
  3. Inclined line with flow downwards
  4. Any direction and in any location

Correct answer: (D)
Any direction and in any location

190. In the case of steady flow of a fluid, the acceleration of any fluid particle is

  1. Constant
  2. Variable
  3. Zero
  4. Zero under limiting conditions

Correct answer: (C)
Zero

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